Uma visão da DPF2011…

Robust Discretization Schemes…

Today, the following article came up on the arXivs:

• “Perfect discretization of reparametrization invariant path integrals” (arXiv:1101.4775 [gr-qc]).

This is all fine and dandy… but my question is: “How does this paper (above) compare to the following”:

• Discrete gauge theory: from lattices to TQFT,
• Discrete Differential Forms, Gauge Theory, and Regge Calculus (PDF).

That is, GR is naturally written in terms of [pseudo-]differential forms (aka tensor densities), so the methods described above should be very appropriate to attack the problem of discretizing the path integral in such a way as to retain its symmetries.

» Robert Oeckl (2005). DISCRETE GAUGE THEORY: From Lattices to TQFT World Scientific eBooks, 1-216 DOI: 10.1142/9781860947377

A semana nos arXivs…

Como vcs devem ter notado, já faz um tempo que não tenho conseguido publicar minha lista de artigos dos arXivs por aqui. Não que eu tenha deixado de ler ou de selecionar meus artigos preferidos nos arXivs — quem acompanha meu Google Buzz ou Google Reader sabe que isso não é verdade (eu leio os arXivs religiosamente todo santo dia ) —, mas o tempo anda cada vez mais curto pra vir aqui e publicar a lista (e o WordPress ainda não fez o favor de instalar o Markdown por aqui, o que é realmente um empecilho pra quem não curte muito o “Visual Editor” ).

De qualquer maneira, agora com o advento do Google Buzz e suas conexões com o Google Reader, a “vida digital” tem mudado um pouco de ângulo… então, eu pensei em dar um drible-da-vaca nessa situação: por que não fazer listas no Twitter?! Basta marcar cada tweet com um #hashtag apropriado, e tudo fica resolvido.

Os #hashtag são evidentes, então já vou linkar direto para os ‘saved searches’ deles,

• #arXiv
• #gr-qc
• #hep-lat
• #hep-th
• #math-ph
• #quant-ph
• #nlin

Assim fica fácil: é até possível se inscrever nos feeds de cada um dos #hashtag!

Vamos ver se essa nova empreitada alça vôo…

A semana nos arXivs…

• Nonassociative Riemannian Geometry by Twisting. (arXiv:0912.1553v1 [math.QA])
• Positive curvature can mimic a quantum. (arXiv:0912.1535v1 [hep-th])
• Instantons, Topological Strings and Enumerative Geometry. (arXiv:0912.1509v1 [hep-th])
• Spontaneous compactification and nonassociativity. (arXiv:0912.1729v1 [hep-th])
• From covariant to canonical formulations of discrete gravity. (arXiv:0912.1817v1 [gr-qc])
• Encoding simplicial quantum geometry in group field theories. (arXiv:0912.1546v1 [gr-qc])
• Time and Spacetime: The Crystallizing Block Universe. (arXiv:0912.0808v1 [quant-ph])
• Self-organizing urban transportation systems. (arXiv:0912.1588v1 [nlin.AO])
• Critical points of Green’s function and geometric function theory. (arXiv:0912.1223v1 [math.CV])
• On Unitary Evolution in Quantum Field Theory in Curved Spacetime. (arXiv:0912.0556v1 [hep-th])
• Circular Symmetry in Topologically Massive Gravity. (arXiv:0912.0708v1 [gr-qc])
• Quantum nonlocality: How does nature do it?
• Are black holes really two dimensional?
• Quark Colors Unbound
• Cobordism and Topological Field Theories Week 3, Cobordism and Topological Field Theories Week 4, Cobordism and Topological Field Theories Week 5, This Week’s Finds in Mathematical Physics (Week 285), This Week’s Finds in Mathematical Physics (Week 286)
• Random covariance matrices: Universality of local statistics of eigenvalues
• Using NVIDIA GPUs and PyCUDA, MIT and Harvard researchers demonstrate a better way for computers to ‘see’
• Irrationality of π

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• Opinion: Can science fight media disinformation?
• The Numerati reviewed by a “numerati wannabe”
• The Obama administration wants OA for federally-funded research: Acesso Aberto para pesquisa feita com dinheiro público!
• What Is Living and What Is Dead in Social Democracy?: uma resenha moderna do que se chama de “Social-Democracia” atualmente
• Japanese scientists call on peers to help save science funding: não é só a atual crise econômica, é um grande relaxo devido ao nosso atual nível de conforto, como se não fosse mais necessário se avançar em nada…
• The Noisy and Prolonged Death of Journalism
• Exercise Boosts Telomerase, Reduces Erosion of Telomeres: sensacional!
• Bohr-Einstein Debates
• 50 Years of Nobel Memories in High Energy Physics
• Fiat Lux

Transcendental Meditation

A semana nos arXivs…

• Benford’s Mathemagical Law (AmStat)
• A scaling method and its applications to problems in fractional dimensional space (JMathPhys)
• Geometry of the quantum projective plane. (arXiv:0912.0106v1 [math.QA])
• Nonequilibrium fluctuations, fluctuation theorems, and counting statistics in quantum systems (ReVModPhys)
• Colloquium: Statistical mechanics of money, wealth, and income (RevModPhys)
• Gauge theories, Simple Groups and Integrable Systems. (arXiv:0911.5257v1 [hep-th])
• Born—Oppenheimer decomposition for quantum fields on quantum spacetimes. (arXiv:0911.5331v1 [gr-qc])
• Hamiltonian formulation of General Relativity 50 years after the Dirac celebrated paper: do unsolved problems still exist?. (arXiv:0911.5252v1 [gr-qc])
• Thermodynamical Aspects of Gravity: New insights. (arXiv:0911.5004v1 [gr-qc])
• Forecasting: it is not about statistics, it is about dynamics (PhilTransRoySocA)
• New and Old Results in Resultant Theory. (arXiv:0911.5278v1 [math-ph])
• Geometrical interpretation of the topological recursion, and integrable string theories. (arXiv:0911.5096v1 [math-ph])
• The Principle of Locality. Effectiveness, fate and challenges. (arXiv:0911.5136v1 [math-ph])
• Emergent Spacetime. (arXiv:0911.4817v1 [hep-th])
• A physics perspective on geometric Langlands duality. (arXiv:0911.4586v1 [hep-th])
• Thermodynamic Bubble Ansatz. (arXiv:0911.4708v1 [hep-th])
• Semiclassical quantum gravity: obtaining manifolds from graphs (ClassQuantGrav)
• Black holes in full quantum gravity (ClassQuantGrav)
• Perturbative quantum field theory via vertex algebras (JMathPhys)
• Proper time is stochastic time in 2d quantum gravity. (arXiv:0911.4211v1 [hep-th])
• New aspects of two-dimensional quantum gravity. (arXiv:0911.4208v1 [hep-th])
• Work on the Manhattan Project, Subsequent Events, and Little Known Facts Related to its Use (arXiv:0911.4088v1 [physics.hist-ph])
• An information theoretic approach to statistical dependence: copula information. (arXiv:0911.4207v1 [q-fin.ST])
• Dynamical compactification from de Sitter space (JHEP)
• The geometry emerging from the symmetries of a quantum system. (arXiv:0911.5270v2 [math-ph])
• Human group formation in online guilds and offline gangs driven by a common team dynamic (PhysRevE)
• Relativity and Singularities – A Short Introduction for Mathematicians. (arXiv:math/0603190v3 [math.DG])
• From Bose-Einstein condensates to the nonlinear Schrodinger equation
• Quantum mechanics and geometry

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• James Hansen: the RMS of Climate Change
• Yet Another Nobel Prize Winner Says That Intellectual Property Is Harming Science: it doesn’t take a Nobel Prize to recognize such an obvious and trivial fact: I, myself, have been saying this for years! Ditto for my advisor… and, in fact, the both of us have convinced L. Cooper (another Nobel winner, famous for the “Cooper pairs” in superconductivity) of this very same fact — and i saw Cooper, after discussing with us, repeat the very same arguments to a room filled with people eager to listen to what “he” had to say on this topic. But, i guess the Sun will become a red giant before anyone without a Nobel prize realizes this…
• Blue skies ahead?
• Dangerous Knowledge – BBC: Cantor, Boltzmann, Gödel, Turing
• Fascinating letter of recommendation written by Robert Oppenheimer, in which a young Richard Feynman is described as “a second Dirac, only this time human”
• Seeing through the ‘two cultures’
• Cargo-cult training
• Not crazy enough
• Currents: Are Metrics Blinding Our Perception?
• This Week’s Finds in Mathematical Physics (Week 284)
• Robert Trivers + Noam Chomsky
• The Buzz: The Climate Scandal That Wasn’t
• Synovial fibroblasts spread Rheumatoid Arthritis to other joints
• Mersenne Twister for Graphic Processors (MTGP)
• Forro in the Dark’s Mauro Refosco on Moving Your Hips to Forró Music, Working with Thom Yorke

A semana nos arXivs…

• Gravity-Yang-Mills-Higgs unification by enlarging the gauge group. (arXiv:0911.3793v1 [hep-th])
• Applications of String Theory: Non-perturbative Effects in Flux Compactifications and Effective Description of Statistical Systems. (arXiv:0911.3800v1 [hep-th])
• PyCUDA: GPU Run-Time Code Generation for High-Performance Computing. (arXiv:0911.3456v1 [cs.DC])
• Canonical Path-Integral Measures for Holst and Plebanski Gravity. II. Gauge Invariance and Physical Inner Product. (arXiv:0911.3436v1 [gr-qc])
• Canonical path integral measures for Holst and Plebanski gravity. I. Reduced Phase Space Derivation. (arXiv:0911.3433v1 [gr-qc])
• Path-integral for the Master Constraint of Loop Quantum Gravity. (arXiv:0911.3432v1 [gr-qc])
• On the Relation between Rigging Inner Product and Master Constraint Direct Integral Decomposition. (arXiv:0911.3431v1 [gr-qc])
• On the Relation between Operator Constraint —, Master Constraint —, Reduced Phase Space —, and Path Integral Quantisation. (arXiv:0911.3428v1 [gr-qc])
• Mapping 6D N = 1 supergravities to F-theory. (arXiv:0911.3393v1 [hep-th])
• Null polygonal Wilson loops and minimal surfaces in Anti-de-Sitter space (JHEP)
• Wheeled props in algebra, geometry and quantization. (arXiv:0911.3321v1 [math.QA])
• Asymptotically Safe Inflation. (arXiv:0911.3165v1 [hep-th])
• Solving Lattice QCD systems of equations using mixed precision solvers on GPUs. (arXiv:0911.3191v1 [hep-lat])
• Deformations of 3-algebras (JMathPhys)
• Phenomenological Quantum Gravity. (arXiv:0911.2761v1 [physics.pop-ph])
• Is the spacetime metric Euclidean rather than Lorentzian?. (arXiv:0911.1479v2 [gr-qc])
• Geometry of Grand Unification. (arXiv:0911.3008v1 [math-ph])
• Zipf’s Law in the Popularity Distribution of Chess Openings (PhysRevLett) e Power laws in chess
• Localization for Wilson Loops in Chern-Simons Theory. (arXiv:0911.2687v1 [hep-th])
• Generalised permutation branes. (arXiv:hep-th/0509153v3)
• Hitchin Equation, Singularity, and N=2 Superconformal Field Theories. (arXiv:0911.1990v1 [hep-th])
• A Physical Interpretation of Gravitational Field Equations. (arXiv:0911.1403v1 [gr-qc])
• Approaches To Quantum Gravity. (arXiv:0911.2135v1 [gr-qc])
• Special polynomials and elliptic integrals. (arXiv:0911.2098v1 [math-ph])
• Abrikosov Lattice Solutions of the Ginzburg-Landau Equations. (arXiv:0911.2432v1 [math-ph])
• Octonions, E6, and Particle Physics. (arXiv:0911.2253v1 [math.RA])
• Ranking scientists (PhysRevLett)
• This Week’s Finds in Mathematical Physics (Week 283)

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• Audacity, Part 3: Funding Audacious Science
• The Paint-Less Coca-Cola Would Save Earth One Can at a Time [Design]
• 6 Inventors Who Got Jack Shit for Changing the Modern World
• Tracking the World’s Great Unsolved Math Mysteries
• Drupal 6 Social Networking
• Free Culture Forum: Getting it Together
• Humanity’s Other Basic Instinct: Math
• Inside Oliver Sacks’s Brain (As He Listens to Music)
• Nov. 17, 1790: A Rather One-Sided Affair: Aniversário do Möbius
• Philosophizing about Programming; or “Why I’m learning to love functional programming”, Writing Basic Functions in Haskell (edited repost) e Types in Haskell: Types are Propositions, Programs are Proofs
• Fight sensibly to stay fit
• Nobelists call for FRPAA: pesquisa científica feita com fundos públicos deve ter acesso aberto e livre!
• Hackers Fail To Crack Brazilian Voting Machines
• Eat Breakfast Like an Olympian with “Super” Oatmeal [Diet]
• “The End of Poverty?”: How the rich steal from the poor
• 5 Things Worth Knowing About Coffee
• Philip Wadler: Transforming the Academy: Knowledge Formation in the Age of Digital Information

Academia vs. Business

Buzzwords

A semana nos arXivs…

• Advanced Mechanics. Mathematical Introduction. (arXiv:0911.0411v1 [math-ph])
• Simulations of supersymmetric Yang-Mills theory. (arXiv:0911.0595v1 [hep-lat])
• New variables for the Einstein theory of gravitation. (arXiv:0911.0282v1 [hep-th])
• Spectral geometry as a probe of quantum spacetime. (arXiv:0911.0401v1 [hep-th])
• Spacetime and fields. (arXiv:0911.0334v1 [gr-qc])
• Skew-symmetric forms: On integrability of equations of mathematical physics. (arXiv:0910.5849v1 [math-ph])
• Dyson’s Instability in Lattice Gauge Theory. (arXiv:0910.5785v1 [hep-lat])
• Time, Topology and the Twin Paradox. (arXiv:0910.5847v1 [gr-qc])
• Feynman Propagator for a Free Scalar Field on a Causal Set (PhysRevLett)
• Beyond fractional derivatives: local approximation of other convolution integrals (RSPA)
• Stochastic expansions and Hopf algebras (PRSA)
• Gravity from a Particle Physicists’ perspective. (arXiv:0910.5167v1 [hep-th])
• Holography from conformal field theory (JHEP)
• Motivic Donaldson-Thomas invariants: summary of results. (arXiv:0910.4315v1 [math.AG])
• Asymptotic safety in gravity and sigma models. (arXiv:0910.4951v1 [hep-th])
• Lectures on holographic methods for condensed matter physics (ClassQuantGrav)
• Energy Landscape of Social Balance (PhysRevLett)
• Thermodynamics shows US chief executives are paid nearly 130 times too much
• This Week’s Finds in Mathematical Physics (Week 282)
• Cheaper Online Textbooks?
• Chern Classes: Part 1

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• Vitaly Ginzburg: a life in physics
• Interview with Manin
• Logicomix: An Epic Search for Truth
• Dreams of Better Schools
• My research paper was rejected to be published. What can I do?
• Explained: P vs. NP: The most notorious problem in theoretical computer science remains open, but the attempts to solve it have led to profound insights
• The Ph.D. Problem: On the professionalization of faculty life, doctoral training, and the academy’s self-renewal
• Race ends in dead heat; Einstein wins
• How messy it all is: Why More Equal Societies Almost Always Do Better
• Soros: Open Society
• What’s wrong with copyright? e Copyright: Want more artistic creation? Protect it less
• Graph Theory to the rescue
• Paul Dirac: Engineer, mathematician, philosopher, physicist
• The Waterloo Institute for Complexity & Innovation
• Lectures on Functional Programming (using Haskell)

'Mike's motto'

A semana nos arXivs…

• Y-system and Quasi-Classical Strings. (arXiv:0910.3608v1 [hep-th]) — mais um passinho na direção de se demonstrar a dualidade AdS/CFT
• Matter from Space. (arXiv:0910.2574v1 [physics.hist-ph])
• Higher-dimensional numerical relativity: Formulation and code tests (PhysRevD)
• Grothendieck’s definition of a group (alguém disse Langlands Duality? )

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• Destino: Animação Surrealista de Salvador Dali e Walt Disney
• O início de uma moderna revolução: Colunista associa período modernista ao surgimento de modelos que romperam com a física clássica — esse artigo vem em contrapartida a um que eu já citei anteriormente (semana passada), mas cito de novo, Abstract Science?
• Higgs, Dark Matter and Supersymmetry: what the LHC will tell us — o interessante mesmo é a citação do Weinberg, sobre o futuro da Teoria de Cordas —, mais comentários podem ser lidos no seguinte link: comentários do Weinberg sobre o LHC, o “Higgs” e Supercordas
• Brazil is the 21st-century power to watch — é um artigo bem escrito, no sentido de que o autor, sutilmente, aponta praquilo que o Brasil realmente tem de potencial; mas, esse não foi um artigo escrito pra ser balanceado e equilibrado em suas visões, então as descrições da violência, etc, são bem superficiais (não necessariamente incorretas, mas enviesadas…)
• My Life as a Quant: Reflections on Physics and Finance: pra quem está pensando em ingressar no Mercado Financeiro, essa é uma boa dica de livro, principalmente pra quem é mais quantitativo

E, pra quem ainda não sabe, o Michael Green (um dos autores dos volumes Superstring theory: Introduction e Superstring theory: Loop Amplitudes, Anomalies and Phenomenology — ainda um dos melhores livros sobre o assunto) foi o escolhido pra substituir o Hawking na Cátedra Lucasiana: Michael Green elected to Hawking’s Cambridge post — entre outros, o Witten e o Maldacena declinaram a oferta.

A semana nos arXivs…

Esta edição vem um pouco atrasada… mas, vem mais recheada também.

• Superstring field theory equivalence: Ramond sector (JHEP)
• Quantum geometry and quantum dynamics at the Planck scale. (arXiv:0910.2936v1 [gr-qc])
• GGI Lectures on the Pure Spinor Formalism of the Superstring. (arXiv:0910.2254v1 [hep-th])
• The group aspect in the physical interpretation of general relativity theory. (arXiv:0910.2073v1 [gr-qc])
• The twin paradox and Mach’s principle. (arXiv:0910.1929v1 [gr-qc])
• A Review and Demonstration of The Essence of Chaos by Edward N. Lorenz. (arXiv:0910.2213v1 [nlin.CD])
• Global well-posedness of the Maxwell-Klein-Gordon equation below the energy norm. (arXiv:0910.1850v1 [math.AP]), com direito a comentários do próprio autor: Global wellposedness for the Maxwell-Klein-Gordon equation below the energy norm
• Generalized instantons in N=4 super Yang-Mills theory and spinorial geometry (JHEP)
• Ten-Dimensional Super-Twistors and Super-Yang-Mills. (arXiv:0910.1684v2 [hep-th])
• A bound on 6D N=1 supergravities. (arXiv:0910.1586v2 [hep-th])
• Building the International Lattice Data Grid. (arXiv:0910.1692v1 [hep-lat])
• Photonic Thermos (sim, é uma garrafa térmica fotônica )
• Girih by Egan

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• The Speed Of Computing
• Abstraction has its place in science as it does in art
• Malcolm Gladwell: How different are dogfighting and football?
• Cleverness is no more. This is a dumb Britain
• Windows Does Not Scale — alguém ainda se surpreende com essas notícias?!
• A Brief History of Gummy Bears — putz, eu adoro gummy bears!
• ChromeOS to be based on Debian — pra quem ainda não sabia… o Google usa Debian há muUuito tempo
• On transparency in research funding
• Math Geek Mom: Women in Science and Math
• Aaron Toponce: A Case For HTML Email — Mashups: confesso que ainda não estou convencido… mas, parece que os argumentos estão ficando cada vez mais fortes…

Cinqüenta anos de exploração espacial

Estupidez vs Ignorância

Leite com chocolate

A semana nos arXivs…

• Lectures on Differential Geometry of Modules and Rings. (arXiv:0910.1515v1 [math-ph])
• 2-Group Representations for Spin Foams. (arXiv:0910.1542v1 [hep-th])
• Financial Applications of Random Matrix Theory: a short review. (arXiv:0910.1205v1 [q-fin.ST])
• The Pure Spinor Formulation of Superstrings. (arXiv:0910.1195v1 [hep-th])
• A Dialogue on the Nature of Gravity. (arXiv:0910.0839v1 [gr-qc])
• Renormalization group trajectories between two fixed points. (arXiv:0910.1063v1 [math-ph])
• Lagrange-Poincare field equations. (arXiv:0910.0874v1 [nlin.CD])
• Light, Links and Causal Sets. (arXiv:0910.0673v1 [gr-qc])
• Cosmological singularity. (arXiv:0910.0374v1 [gr-qc])
• Non-perturbative Field Theory. (arXiv:0910.0812v1 [hep-th])
• Covariant Star Product for Exterior Differential Forms on Symplectic Manifolds. (arXiv:0910.0459v1 [hep-th])
• Cell processor implementation of a MILC lattice QCD application. (arXiv:0910.0262v1 [hep-lat])
• Lorentzian wormholes generalize thermodynamics still further
• Statistical challenges of high-dimensional data
• Observed universality of phase transitions in high-dimensional geometry, with implications for modern data analysis and signal processing
• Quasiparticles do the twist

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• Faheem Hussain — As I Knew Him
• Israel Gelfand, Sept. 2nd 1913 — Oct. 5th 2009
• Israel Gelfand
• Bourbaki Archives
• Science and the arts need not be strangers
• Intellectual Elitism? You get what you give.
• Gen-F Scientists Ignoring Social Networking
• Face it: Being a scientist can really suck
• Sounds Familiar
• Energy savings in black and white
• Pain and rheumatology: an overview of the problem
• The Short View — Financial Times sobre o Brasil
• CeeVee Creates Clean-Looks Resumes for Web or Print [Resume]
• Google Docs Viewer Bookmarklet Makes PDFs Less Freeze-y [Bookmarklet]
• Google Wave 101 [Google Wave]

… na cama

A semana nos arXivs…

• Three Etudes in QFT. (arXiv:0909.4424v1 [hep-th])
• The β-function over curved space-time under ζ-function regularization. (arXiv:0909.4122v1 [math-ph])
• Geometry of Renormalization. (arXiv:0909.4117v1 [math-ph])
• Three-dimensional topological field theory and symplectic algebraic geometry II. (arXiv:0909.3643v2 [math.AG])
• Aspects of Symmetries in Field and String Theories. (arXiv:0909.4057v1 [hep-th])
• Quantum Critical Dynamics from Black Holes. (arXiv:0909.3553v1 [cond-mat.str-el])
• Stochastic expansions and Hopf algebras
• All vacuum near horizon geometries in arbitrary dimensions. (arXiv:0909.3462v1 [gr-qc])
• Quantum gravity without space-time singularities or horizons. (arXiv:0909.3426v1 [gr-qc])
• Spontaneous Dimensional Reduction in Short-Distance Quantum Gravity?. (arXiv:0909.3329v1 [gr-qc])
• Replication regulates volume weighting in quantum cosmology
• The weak and strong ends of a theory
• The Gömböc: a nearly-impossible, self-righting, homogenous shape
• Ben-Zvi’s Lectures on Topological Field Theory III
• Steen on mathematics and biology
• Physics: The edge of physics
• Entanglement In The Macroworld

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• How To Write A Scientific Paper
• Science, Pseudoscience and Bollocks
• The socialisation of scientific and technological research
• A speech for the American Academy of Arts and Sciences
• Jono Bacon: The Art of Community Available For Free Download
• PyOpenCL lets you access the OpenCL parallel computation API from Python e PyCUDA lets you access Nvidia‘s CUDA parallel computation API from Python

A semana nos arXivs…

• Deriving particle physics from quantum gravity: a plan. (arXiv:0909.3223v1 [hep-th])
• Introductory Lectures on String Theory. (arXiv:0808.0663v1 [physics.pop-ph])
• Proof by Coinduction
• A speech for the American Academy of Arts and Sciences

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• Jono Bacon: The Art of Community Available For Free Download
• The Glamorous Life Of A Science Journalist
• Science Needs a Storyline
• Should scientists be policy advocates?

A semana nos arXivs…

• Time in quantum physics: From an external parameter to an intrinsic observable. (arXiv:0909.1899v1 [math-ph])
• Some remarks on the geometric quantization of contact manifolds. (arXiv:0909.2023v1 [math.SG])
• Space does not exist, so time can. (arXiv:0909.1861v1 [gr-qc])
• Spectral action in noncommutative geometry and global pseudodifferential calculus. (arXiv:0909.1261v1 [math-ph])
• Topics in Noncommutative Geometry Inspired Physics. (arXiv:0909.1000v1 [hep-th])
• Loop and surface operators in N=2 gauge theory and Liouville modular geometry. (arXiv:0909.0945v1 [hep-th])
• Chaos in Partial Differential Equations. (arXiv:0909.0910v1 [nlin.CD])
• 6 Lectures on QFT, RG and SUSY. (arXiv:0909.0859v1 [hep-th])
• Change Course, por Steven Weinberg
• Theory of Rumour Spreading in Complex Social Networks.
• B-N-R Part 3: PPAV’s and some details
• B-N-R Part 4: Prym Varieties
• B-N-R Part 5: Spectral Curves

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• Science And Journalism: Scientists Engage Journalists More Than Is Perceived
• Research, Not Relations…
• País investe menos de 25% que ricos em ensino
• Not All Interactive Engagement is the Same: Variations in Physics Professors’ Implementation of “Peer Instruction”
• Mathematicians: An Outer View of the Inner World
• Einstein has an H’ Index of 1?
• Mistaking Beauty for Truth in Science and in Economics — “Because of the success of perturbation theory, the physicists’ mathematical knowledge has reduced to a certain familiarity with the greek alphabet…”, R. Jost
• This Week’s Finds in Mathematical Physics (Week 279)
• Economics Is Not a Natural Science

Ilusão

A semana (que passou) nos arXivs…

• Discrete non-commutative integrability: the proof of a conjecture by M. Kontsevich. (arXiv:0909.0615v1 [math-ph])
• Stochastic quantization and the role of time in quantum gravity. (arXiv:0908.4224v1 [hep-th])
• Division algebras and supersymmetry. (arXiv:0909.0551v1 [hep-th]) (Division Algebras and Supersymmetry)
• General relativity with small cosmological constant from spontaneous compactification of Lovelock theory in vacuum
• Quantization of Integrable Systems and Four Dimensional Gauge Theories. (arXiv:0908.4052v1 [hep-th])
• Introduction to Special Issue: Integrable Quantum Systems and Solvable Statistical Mechanics Models
• Entangled quantum states in a local deterministic theory. (arXiv:0908.3408v1 [quant-ph])
• Dequantization of the Dirac monopole
• The hidden mathematics of bathrooms
• Where Have All the Solitons Gone?
• This Week’s Finds in Mathematical Physics (Week 278)
• B-N-R Part 1: Twisted Endomorphisms, B-N-R Part 2: Moduli of Vector Bundles

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• Institutions slap down those who speak up, argues campaigning scholar
• Can Science Be “Humanized?”
• Science Reporting and Evidence-Based Journalism
• They Might Be Giants Keeps Pop Kid-Friendly With Smart ‘Here Comes Science’
• An Update on C. P. Snow’s “Two Cultures”

A semana nos arXivs…

• Information-theoretic natural ultraviolet cutoff for spacetime. (arXiv:0908.3061v1 [gr-qc]) (mais sobre esse artigo depois do corte )
• Pushing the envelope of general relativity, Solutions to Hořava Gravity
• Higher-Dimensional Algebra VII: Groupoidification

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• How to publish a scientific comment: an awfully sad and funny story from a physics professor
• Today in Science History: August 24th
• 6 Bullshit Facts About Psychology That Everyone Believes
• Will Brazil Binge on Oil?
• Groove to the physics mix tape

E, pra fechar em ressonância com o “Physics Mix Tape”, nada melhor que Klein 4,

A semana nos arXivs…

• A Prehistory of n-Categorical Physics. (arXiv:0908.2469v1 [hep-th])
• A Quantum Arrow of Time, Quantum Solution to the Arrow-of-Time Dilemma
• Quantum Picturalism. (arXiv:0908.1787v1 [quant-ph])
• Wilsonian vs 1PI Actions
• Random matrices: Universality of local eigenvalue statistics up to the edge
• August 2009 issue of symmetry now online

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• Alan Sokal, science, and politics
• The curse of knowledge: Mistaking your beliefs for those of others
• Busca global: o setor privado investe pouco em pesquisa
• The Bologna Process and the Transformation of European Higher Education
• Collections
• Unification

A semana nos arXivs…

• Effective Field Theory, Past and Future. (arXiv:0908.1964v1 [hep-th])
• Fibre Bundles, Jet Manifolds and Lagrangian Theory. Lectures for Theoreticians. (arXiv:0908.1886v1 [math-ph])
• A Simple Introduction to Particle Physics Part II. (arXiv:0908.1395v1 [hep-th])
• Stable homology as an indicator of manifoldlikeness in causal set theory
• This Week’s Finds in Mathematical Physics (Week 277) — pra quem curte grafenos, é um prato cheio
• Dan Ghica on Software vs Hardware (pra quem gosta de Categorias aplicada em Física… )
• Asymptotics of the Magnitude of Metric Spaces
• Some different ideas of “state”

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• Hans Christian Ørsted: Thanks for the gedankenexperimenten
• Eastern vs. Western emoticons
• Morre Imre Simon, pioneiro da computação
• Divulgado novo censo do CNPq sobre grupos de pesquisa no Brasil, Um plano de educação para a cidade de SP, artigo de Maria Alice Setubal
• UK parliament questions value of degrees — é um pouco de ‘food for thought’ pra toda essa discussão sobre o valor dos diplomas no Brasil…
• Science, Truth and Consistency
• Dogs as Smart as 2-year-old Kids

A semana nos arXivs…

• The Measurement Process in Local Quantum Theory and the EPR Paradox. (arXiv:0908.0480v1 [quant-ph])
• On the Problem of Renormalizability in Non-Commutative Gauge Field Models – A Critical Review. (arXiv:0908.0467v1 [hep-th])
• Lectures on String Theory. (arXiv:0908.0333v1 [hep-th])
• Asymptotically free N=2 theories and irregular conformal blocks. (arXiv:0908.0307v1 [hep-th])
• The falling raindrop, revisited. (arXiv:0908.0090v1 [physics.class-ph])
• Dragon-Kings, Black Swans and the Prediction of Crises. (arXiv:0907.4290v1 [physics.data-an])
• Neighborly networks
• Positional Effects on Citation and Readership in arXiv. (arXiv:0907.4740v1 [cs.DL])
• A bound on the effective gravitational coupling from semiclassical black holes. (arXiv:0907.5516v1 [hep-th])
• TASI Lectures on Inflation. (arXiv:0907.5424v1 [hep-th])
• A Duality For The S Matrix. (arXiv:0907.5418v1 [hep-th])
• Measurement of the W boson mass. (arXiv:0908.0766 [hep-ex])
• The controversial subject of econophysics
• BRST and Dirac Cohomology
• Ben-Zvi’s Lectures on Topological Field Theory I, Ben-Zvi’s Lectures on Topological Field Theory II

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• How Hard Is it to Convert Seawater Into Fresh Drinking Water? — por alguma razão não-tão-mágica assim, eu achei que esse outro link viria bem a calhar pareado com esse aqui: Oil supplies are running out faster than expected
• Do Students Use and Understand Free-Body Diagrams?
• Fibonacci Chaos and Time’s Arrow
• The truth about grit: Modern science builds the case for an old-fashioned virtue — and uncovers new secrets to success
• PLoS ONE Impact Factor and Page Rank
• The Evolution of the Troll: From Internet Tough Guy to ‘Meh’
• “On the Shortness of Life”: Advice from an ancient Roman on how to live fully
• Forget Red vs. Blue — It’s the Educated vs. People Easily Fooled by Propaganda
• How to Get Cancer: Move to the United States
• Charles Barkley’s Top 50 Quotes

A semana nos arXivs…

• Spin and Statistics and First Principles. (arXiv:0907.5313v1 [quant-ph])
• Clifford algebra, geometric algebra, and applications. (arXiv:0907.5356v1 [math-ph])
• Recent Progress in AdS/CFT. (arXiv:0907.4972v1 [hep-th])
• Rademacher sums, Moonshine and Gravity. (arXiv:0907.4529v1 [math.RT])
• Loop Quantum Gravity a la Aharonov-Bohm. (arXiv:0907.4388v1 [gr-qc])
• An Introduction to Stochastic PDEs. (arXiv:0907.4178v1 [math.PR])
• Holonomy loops, spectral triples and quantum gravity
• How Far Are We from the Quantum Theory of Gravity?. (arXiv:0907.4238v1 [gr-qc])
• Is Quantum Theory Exact?
• Improved and Perfect Actions in Discrete Gravity. (arXiv:0907.4323v1 [gr-qc]), Regge calculus from a new angle. (arXiv:0907.4325v1 [gr-qc])
• Generalized instantons in N = 4 super Yang-Mills theory and spinorial geometry. (arXiv:0907.4174v1 [hep-th])
• Randomness Reigns in Crystalline Order
• Physics – Swinging and springing
• Topology that Algebra can’t see
• “Poincaré’s legacies” now published

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• Should Copyright Of Academic Works Be Abolished?
• Influences on Peer Review: Authors as Reviewers
• The Size of the Universe: A Hard Question
• Living in Tents, and by the Rules, Under a Bridge (Providence, RI): essa é praqueles que acham que a “crise” já acabou…
• Accepting math papers that other journals reject
• Brewed Awakenings: The World’s 4 Weirdest Coffees
• If a screening test is 90% accurate, and your result comes back positive, what are the chances it is a false positive?
• JANE: Journal and Author Name Estimator
• fabricate: The better “make” — finds dependencies automatically for any language
• Create an iPhone Document Scanner from Cardboard [Scanner Hacks]
• Theory of Games and Economic Misbehavior
• Universidade brasileira: a caminho da decadencia
• Op-Ed Contributor – Science Is in the Details – NYTimes.com
• à caça de tendências: Alexandre Abdo (do CCM) na Folha de São Paulo — quem gosta desse assunto pode ler mais no seguinte link

A semana nos arXivs…

Essas últimas três semanas foram corridas, de colaborações à visitas, incluindo os arXivs saírem do ar por 2 dias. Então, a pilha de artigos está um pouco volumosa… vamos a ela.

• The History of the Guralnik, Hagen and Kibble development of the Theory of Spontaneous Symmetry Breaking and Gauge Particles. (arXiv:0907.3466v1 [physics.hist-ph])
• An index theorem in differential K-theory. (arXiv:0907.3508v1 [math.DG])
• Wall-crossing, Hitchin Systems, and the WKB Approximation. (arXiv:0907.3987v1 [hep-th])
• Formulation of Supersymmetry on a Lattice as a Representation of a Deformed Superalgebra. (arXiv:0907.4137v1 [hep-th])
• Motives: an introductory survey for physicists. (arXiv:0907.4046v1 [hep-th])
• Remarks on Khovanov Homology and the Potts Model. (arXiv:0907.3178v1 [math.GT])
• Landmarks: Powerful Pictures
• QFT: Effective or Fundamental?
• Chiral symmetry breaking and theta vacuum structure in QCD. (arXiv:0907.2522v1 [hep-th])
• Perturbative Quantum Field Theory via Vertex Algebras. (arXiv:0906.5313v1 [math-ph])
• Finite propagation speed and causal free quantum fields on networks. (arXiv:0907.1522v1 [hep-th])
• The Hamiltonian formulation of N-bein, Einstein-Cartan, gravity in any dimension: the Progress Report (Extended version of a talk given on CAIMS-2009, June 11-14, London, Canada). (arXiv:0907.1553v1 [gr-qc])
• Dynamical aspects of generalized Palatini theories of gravity
• A New Mechanism for Bubble Nucleation: Classical Transitions. (arXiv:0907.3234v1 [hep-th])
• Lorentz symmetry breaking as a quantum field theory regulator
• Quantum Measurements: Common Sense Is Not Enough, Physicists Show
• Nobel Lecture: Spontaneous symmetry breaking in particle physics: A case of cross fertilization
• Thomas Noll’s Talks at Chicago on Mathematical Music Theory
• Fermilab stars in new documentary
• A number-theoretic coincidence
• Google Earth Physics?
• SSE Composite Index Bubble?
• Opera ‘strings’ theory together

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• Science Clichés: Steer Clear
• Budgets by the People: Participatory democracy, Brazil-style, is running into problems
• Seeing Like Citizens: Unofficial Understandings of Official Racial Categories in a Brazilian University
• Brazil’s Blessing in Disguise | Foreign Policy
• Fordlandia: Henry Ford’s Ill-Fated Foray Into the Brazilian Jungle
• President Lula and the Brazilian Cybercrime Bill
• Drained Brains
• “Conhecimento científico é o capital mais importante do mundo”, diz Isaac Roitman
• Desregulamentar TODAS as profissoes, Alexandre de Barros
• Físico Flávio Torres assume por quatro meses mandato no Senado, Pesquisador do CBPF fará parte do conselho editorial de publicação da Royal Society
• Mestres e doutores, para quê?, artigo de Aguinaldo Alemar
• E.O. Wilson – Lord of the Ants
• 5 Cover tunes that rank with the originals
• A Practical Guide to Internet Technology for Political Activists in Repressive Regimes
• Pink Floyd’s Moon-Landing Jam Session
• Malcolm Gladwell: Banks, battles, and the psychology of overconfidence
• More from Pais: Einstein and bordellos?
• Why Are Some People Smarter Than Others?
• Science Journalism in a Can
• Why America is flunking science
  — quisera eu esse fosse apenas um problema dos USA…
• In Praise of Sprezzatura: The Compleat Gentleman Giveaway
• Nature Or Nurture? Neither, Say Developmental Systems Theorists
• NASA Ninja Turtle Logo
• Dog Breed Matters If You Want To Communicate
• Turn Gmail Into Your Ultimate GTD Inbox

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Toons…

• 07/15/09 PHD comic: ‘Nature vs. Science, pt. 1′
• 07/17/09 PHD comic: ‘Nature vs. Science, pt. 2′
• 07/20/09 PHD comic: ‘Nature vs. Science, pt. 3′
• Threesome
• 07/13/09 PHD comic: ‘Great Tweets of Science’
• 07/6/09 PHD comic: ‘Is your research Impossible?’

A semana nos arXivs…

• The History of the Guralnik, Hagen and Kibble Development of the Theory of Spontaneous Symmetry Breaking and Gauge Particles
• Einstein-Gauss-Bonnet metrics: black holes, black strings and a staticity theorem. (arXiv:0906.4953v1 [hep-th])
• On the Poincare Gauge Theory of Gravitation. (arXiv:0907.0934v1 [gr-qc])
• Rigorous construction and Hadamard property of the Unruh state in Schwarzschild spacetime. (arXiv:0907.1034v1 [gr-qc])
• The Hamilton–Jacobi Theory and the Analogy between Classical and Quantum Mechanics. (arXiv:0907.0964v1 [math-ph])
• Gauge theory of Faddeev-Skyrme functionals. (arXiv:0907.0899v1 [math-ph])
• Sudden death of entanglement and teleportation fidelity loss via the Unruh effect. (arXiv:0907.0485v1 [gr-qc])
• Feynman integrals and motives. (arXiv:0907.0321v1 [math-ph])
• The Formulation of Quantum Field Theory in Curved Spacetime. (arXiv:0907.0416v1 [gr-qc]), Introduction to Gravitational Self-Force. (arXiv:0907.0412v1 [gr-qc]) e Derivation of Gravitational Self-Force. (arXiv:0907.0414v1 [gr-qc])

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• A brief biography of Oppenheimer and Fermi
• Electrons in graphene: an interacting fluid par excellence
• Problems that are hard for intermediate values of some parameter
• Python vs Matlab vs Mathematica
• The Engine of Scientific Progress: Sharing
• Some Optimism for the Future of Science Journalism
• On Schwinger and QED

Sigma Freud fazendo terapia das relações

A semana nos arXivs…

• The Global Geometry of Stochastic Loewner Evolutions. (arXiv:0906.5328v1 [math-ph])
• Perturbative Quantum Field Theory via Vertex Algebras. (arXiv:0906.5313v1 [math-ph])
• What it takes to be a team player
• The birth of the blues: how physics underlies music
• Is scientific publishing about to be disrupted? e Biella Coleman: Academic Publishing
• Springer Verlag Publishes ‘Proof’ of Goldbach’s Conjecture — essa é mais uma pra lista de patetices qe vêm acontecendo ultimamente

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• Increasingly Popular Research Yields Increasingly Unreliable Results
• A Principal Component Analysis of 39 Scientific Impact Measures
• Local Systems: The connection perspective
• Malcolm Gladwell: Is free the future?
• Scientific Computing: Fortran90 vs C/C++
• Amazing LEGO Art by Nathan Sawaya — e, pra quem ainda não conhece: Mathematical LEGO® Sculptures, Rodin’s Thinker in LEGO®, Escher’s “Balcony” in LEGO®, Escher’s “Belvedere” in LEGO®, Escher’s “Ascending and Descending” in LEGO®, Escher’s “Relativity” in LEGO®, Escher’s “Waterfall” in LEGO®
• 10 Ways to Learn Stuff While Procrastinating Online

P.S.: No Brasil, eu sempre soube que “cappuccino” era café com leite e chocolate. Infelizmente, o resto do mundo todo chama esse danado de “caffé mocha” — enquanto que cappuccino é o nome dado pra café com leite e espuma [de leite]. Vai saber… mas, pelo menos, agora eu tenho uma tabelinha pra me lembrar, Coffee Drinks Recipes (Graphic).

A semana nos arXivs…

• A Brief Introduction to Wilson Loops and Large N. (arXiv:0906.4487v1 [hep-th])
• On the eigenvalues of the twisted Dirac operator
• Black holes, information, and decoherence
• Branes, instantons, and Taub-NUT spaces
• Fractional quantum Hall effect via holography: Chern-Simons, edge states and hierarchy
• Zeros of Airy Function and Relaxation Process. (arXiv:0906.3666v1 [math.PR])
• Constructive Field Theory in Zero Dimension. (arXiv:0906.3524v1 [math-ph])
• Quantum gravity as sum over spacetimes. (arXiv:0906.3947v1 [gr-qc]), In Search of Fundamental Discreteness in 2+1 Dimensional Quantum Gravity. (arXiv:0906.3547v1 [gr-qc])
• Prospects for constraining quantum gravity dispersion with near term observations. (arXiv:0906.3731v2 [astro-ph.HE])
• Monty Hall, Monty Fall, Monty Crawl
• This Week’s Finds in Mathematical Physics (Week 275)
• A force by any other name…

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• Dyson’s stance on climate change: excelente entrevista, contendo mais detalhes e contextualizando apropriadamente a postura do Dyson — e olha que ele nem falou nada sobre plânctons, algas e recifes (e metano)!
• Increasingly Popular Research Yields Increasingly Unreliable Results
• Melhores machos têm menos filhos ou Good males are bad fathers
• Is Science Journalism Breaking the Convention? e The Priesthood of Science Journalism
• Splish! Splash! Hydrotherapy for chronic back pain is pretty good!
• Opinion: Invest in UK science says Martin Rees
• Editors in Web2.0
• Hide files in an image
• Conference Networking e Networking Tips for the Introverted
• [Editorial] Science Journalism Goes Global
• Science can bridge national divides | David Kerr, Are we witnessing the end of science? | Ehsan Masood
• Quantum Mechanics Visible In Everyday Life?
• O papel da universidade, artigo de Gil da Costa Marques
• Fair Research Assessments Require Extensive Deliberation, On article-level metrics and other animals, Impact Factor Boxing 2009
• 7 Man-Made Substances that Laugh in the Face of Physics
• Ciência em ação e Apoio inédito a pesquisa