BIP no TWITTER, parte II

Backup file made by TweetBackup 2010-02-06 14:10:18

2010-02-05 13:47:20
lasleandro: O Pastor de Almas http://bit.ly/9CTj9h

2010-02-04 09:19:45
lasleandro: RT @sspedro: Versão online de Windows 3.1: http://www.michaelv.org/

2010-02-04 09:17:34
lasleandro: RT @brasilciencia: “IMAX”, “Hubble” and “3D” in the same sentence — total slamdunk! :: 2010-Mar-19: “IMAX Hubble 3D”, http://bit.ly/6RZ1 …

2010-02-03 03:32:38
lasleandro: The Search for Extra Terrestrial Intelligence: A Philosophical Inquiry http://bit.ly/aFkgnu

2010-02-03 18:14:31
lasleandro: San Francisco’s Answer to Westboro Baptist Church http://bit.ly/bQdNvf

2010-02-03 18:14:27
lasleandro: Evolution by Steve Jobs http://bit.ly/aNeXHm

2010-02-03 18:13:15
lasleandro: Why I Don’t Check Voicemail Anymore http://bit.ly/bi1uJV

2010-02-03 18:13:10
lasleandro: Coffee Foam Art http://bit.ly/c1xVvD

2010-02-03 18:11:52
lasleandro: 10 Movie Inventions Better Than the iPad http://bit.ly/aofa6p

2010-02-03 18:11:48
lasleandro: Formula of iPad http://bit.ly/bRjB8S

2010-02-03 18:09:13
lasleandro: Hubble Detects Mysterious Spaceship-Shaped Object Traveling at 11,000MPH [Space] http://bit.ly/aCnyZy

2010-02-03 18:02:52
lasleandro: hauha… Encyclopedias Are Still Helpful http://bit.ly/b3mkni #fun

2010-02-03 17:14:29
lasleandro: gentlemen, start your engines!!! http://tinyurl.com/y8lm8ot

2010-02-03 13:57:50
lasleandro: RT @melodaf: A Polícia do Pensamento, vulgo Rede Globo, deixou escapar esta magnífica CrimeIdéia: http://bit.ly/b4iUTc #1984 #bigbrother …

2010-02-03 13:39:48
lasleandro: Passageiro pula de catamarã para nadar na Baía de Guanabara http://bit.ly/9SmYwK … esse é corajoso…

2010-02-02 18:10:37
lasleandro: Strongly interacting dark matter ruled out by observations http://bit.ly/d6dd5R #physics

2010-02-02 18:05:56
lasleandro: Mathematical Model of Easter Island Society Collapse. (arXiv:1002.0068v1 [q-bio.PE]) http://bit.ly/cuvJhq #qbio

2010-02-02 17:55:36
lasleandro: Cosmology of the very early universe. (arXiv:0804.2240v1 [gr-qc] CROSS LISTED) http://bit.ly/aEQILY #atroph

2010-02-02 17:05:57
lasleandro: Jogos para PC que serão lançados em Fereveiro 2010 http://bit.ly/bTCmLZ
#pcgames

2010-02-01 23:46:27
lasleandro: 01/18/10 PHD comic: ‘ASAP!’ http://bit.ly/89Fzm3 #fun

2010-02-01 23:44:55
lasleandro: 01/25/10 PHD comic: ‘Cafeteria Potential Well’ http://bit.ly/bC8lt5 #fun

2010-02-01 18:13:39
lasleandro: Physicists Discover How to Grow Graphene http://bit.ly/darbSq #physics

2010-02-01 17:24:35
lasleandro: RT @naosalvo: Voces tem noçao que hoje é dia 1 de fevereiro, né? E o que isso quer dizer: http://bit.ly/aubeuw Onde esta seu Deus agora?

2010-02-01 12:29:49
lasleandro: DoThisNow – Simple Desktop Automation http://bit.ly/db3RB7 #ubuntu

2010-02-01 12:27:26
lasleandro: After Burner reaparece no PS3 e X360 http://bit.ly/aEtdNa

2010-02-01 04:26:39
lasleandro: Feynman :: Rules of Chess http://bit.ly/aRcAdY #physics

2010-02-01 04:25:15
lasleandro: PlayLab and Informal Science http://bit.ly/cDTRdO #science

2010-02-01 04:15:25
lasleandro: Krauss and an Overview of Cosmology http://bit.ly/cAC1bg #cosmology #physics

2010-02-01 04:14:02
lasleandro: Teaching Tip: Blank Paper http://bit.ly/bymuaM #physics

2010-01-29 19:54:34
lasleandro: Conheça as preocupações dos físicos na “era do LHC” http://tinyurl.com/ybv7gxf #physics

2010-01-29 19:52:44
lasleandro: Projeto de lei quer liberar venda avulsa de canais de TV paga http://bit.ly/Zw8DC

2010-01-29 19:42:36
lasleandro: Google Reader agora avisa sobre atualizações em qualquer site http://bit.ly/Zw8DC #google

2010-01-28 23:04:07
lasleandro: Entanglement degradation in the solid state: interplay of adiabatic and quantum noise. http://bit.ly/bM6vwN #physics

2010-01-28 22:53:45
lasleandro: Extra Dimensions at the LHC. (arXiv:1001.4801v1 [hep-ph]) http://bit.ly/9q4XAM hepph

2010-01-28 22:53:35
lasleandro: Dark Energy and Dark Matter. (arXiv:1001.5014v1 [hep-ph]) http://bit.ly/9r50kh #hepph

2010-01-28 22:51:50
lasleandro: Naturality, unification and dark matter. (arXiv:1001.4936v1 [astro-ph.CO]) http://bit.ly/aaVogG #astroph

2010-01-28 21:50:37
lasleandro: Dia Internacional da Privacidade de Dados http://bit.ly/90Pos7

2010-01-28 18:27:06
lasleandro: RT @ComoFunciona: Nenhum espião faz seu trabalho sem um óculos de visão noturna! Saiba como eles funcionam: http://bit.ly/do7rdw

2010-01-26 19:33:10
lasleandro: Dynamics of tournaments: the soccer case. (arXiv:1001.2854v1 [physics.data-an]) http://bit.ly/9hmQ85 #physics

2010-01-26 19:28:25
lasleandro: An Infinite Fractal Cosmos. (arXiv:1001.2865v1 [physics.gen-ph]) http://bit.ly/coUsUG #physics

2010-01-26 19:26:50
lasleandro: Unification and Emergence in Physics: the Problem of Articulation. http://bit.ly/bZAPhp #physics

2010-01-26 19:24:28
lasleandro: The fundamental importance of discourse in theoretical physics. (arXiv:1001.4111v1 [quant-ph]) http://bit.ly/bFQAoF #physics

2010-01-26 19:22:12
lasleandro: Cosmological thinking: cultural heritage and challenge. (arXiv:1001.4196v1 [physics.pop-ph]) http://bit.ly/8ZCU1F #physics

2010-01-26 19:20:41
lasleandro: #hepth Large Extra Dimensions and Small Black Holes at the LHC. (arXiv:1001.2211v3 [hep-ph] UPDATED) http://bit.ly/aIljeI

2010-01-26 19:16:37
lasleandro: The cosmological singularity problem. (arXiv:1001.4367v1 [hep-th]) http://bit.ly/azPHVF #physics

2010-01-26 12:10:47
lasleandro: Com vocês, Stallman Facts http://bit.ly/7QU0Ts

2010-01-26 12:06:19
lasleandro: RT @kenmori: A dramaticidade de um gato http://migre.me/hEA4 #lolcat

2010-01-25 03:24:18
lasleandro: Quantum theory, gravity, and the standard model of particle: using the hints of today to build the final theory http://bit.ly/4GJQeC

2010-01-25 02:38:55
lasleandro: Howto access ext3 partition from Windows http://bit.ly/7VE6PP #ubuntu

2010-01-25 23:44:36
lasleandro: 50 years of the laser http://bit.ly/8BQOMu #physics

2010-01-25 23:43:53
lasleandro: Isaac Newton’s gravitation paper goes online http://bit.ly/4TTVQX #physics

2010-01-25 23:42:14
lasleandro: Critical Casimir Effect http://bit.ly/67YuH6 #physics

2010-01-25 23:40:07
lasleandro: Physicist, Physician, Physical Therapist? http://bit.ly/5dV5tB #physics

2010-01-25 14:35:36
lasleandro: The limits of cosmology. (arXiv:1001.4016v1 [physics.pop-ph]) http://bit.ly/7y7xSd #physics

2010-01-24 19:13:43
lasleandro: I favorited a YouTube video — bujinkan montenegro Lazarevic Predrag http://youtu.be/_H-I7LCiB9A?a

2010-01-24 17:10:47
lasleandro: ÜberStudent – Ubuntu version for Students and Researchers http://bit.ly/5K38Y3

2010-01-24 04:56:19
lasleandro: Colliding Particles Can Make Black Holes http://bit.ly/5WMjaR #physics

2010-01-23 18:11:54
lasleandro: Public Health Authorities: Couch Potato Syndrome Leads to Rickets | Discoblog http://bit.ly/7Ejp5h

2010-01-23 14:26:21
lasleandro: Water Planets http://bit.ly/640UET #science

2010-01-23 12:43:12
lasleandro: When Does Science Become Technology And Why Does It Matter? http://bit.ly/6DAmBA #science

2010-01-22 16:32:50
lasleandro: A First Course on Twistors, Integrability and Gluon Scattering Amplitudes. http://bit.ly/8kHeBJ #physics

2010-01-22 16:31:17
lasleandro: The Physical Properties of the Cosmic Acceleration. (arXiv:1001.1811v2 [astro-ph.CO] CROSS LISTED) http://bit.ly/61bULf

2010-01-22 14:16:57
lasleandro: Fotos pioneiras de cristais de neve vão à venda em Nova York http://bit.ly/5W1hNQ

2010-01-22 14:14:45
lasleandro: “Lake Views” by Steven Weinberg http://bit.ly/6xr0rA #physics

2010-01-22 14:12:58
lasleandro: Flying R2-D2, you are doing it wrong http://bit.ly/5l7EOV #physics

2010-01-21 18:18:20
lasleandro: Non-Markovian effect on the geometric phase of a dissipative qubit. http://bit.ly/6GovtL #physics

2010-01-21 18:02:52
lasleandro: Chaos Models in Economics. (arXiv:1001.3492v1 [nlin.CD]) http://bit.ly/4UKPEB

2010-01-21 03:36:13
lasleandro: How to install GNOME Activity Journal in Ubuntu http://bit.ly/8NN8Fv #ubuntu

2010-01-19 04:01:27
lasleandro: Passageiros dizem que trem da SuperVia circulou sem maquinista http://bit.ly/6eQ1ac #supervia hauha

Mundial

O nome do supermercado é Mundial e além disso ainda usam esse 7 estranho… humm… muito suspeito hein… Agora só falta eles aprenderem com Mr. Ratzel que o espaço é vital, pois os corredores são muito estreitos!

arXiv Highlights 1

Dark Energy and Dark Matter. (arXiv:1001.5014v1 [hep-ph]): ”

A brief overview of our current understanding of abundance and properties of dark energy and dark matter is presented. A more focused discussion of supersymmetric dark matter follows. Included is a frequentist approach to the supersymmetric parameter space and consequences for the direct detection of dark matter.

“

Extra Dimensions at the LHC. (arXiv:1001.4801v1 [hep-ph]): ”

We discuss the motivation and the phenomenology of models with either flat or warped extra dimensions. We describe the typical mass spectrum and discovery signatures of such models at the LHC. We also review several proposed methods
for discriminating the usual low-energy supersymmetry from a model with flat (universal) extra dimensions. (For the official website of the book, see this http URL .)

“

Particle physics models of inflation and curvaton scenarios. (arXiv:1001.0993v2 [hep-ph] UPDATED): ”

We review the particle theory origin of inflation and curvaton mechanisms for generating large scale structures and the observed temperature anisotropy in the cosmic microwave background (CMB) radiation. Since inflaton or curvaton energy density creates all matter, it is important to understand the process of reheating and preheating into the relevant degrees of freedom required for the success of Big Bang Nucleosynthesis. We discuss two distinct classes of models, one where inflaton and curvaton belong to the hidden sector, which are coupled to the Standard Model gauge sector very weakly. There is another class of models of inflaton and curvaton, which are embedded within Minimal Supersymmetric Standard Model (MSSM) gauge group and beyond, and whose origins lie within gauge invariant combinations of supersymmetric quarks and leptons. Their masses and couplings are all well motivated from low energy physics, therefore such models provide us with a unique opportunity that they can be verified/falsified by the CMB data and also by the future collider and
non-collider based experiments. We then briefly discuss stringy origin of inflation, alternative cosmological scenarios, and bouncing universes.

“

An Economic analogy to Electrodynamics. (arXiv:1001.1847v2 [physics.gen-ph] UPDATED): ”

In this note, we would like to find the laws of electrodynamics in simple economic systems. In this direction, we identify the chief economic variables and parameters, scalar and vector, which are amenable to be put directly into the crouch of the laws of electrodynamics, namely Maxwell’s equations. Moreover, we obtain Phillp’s curve, recession and Black-Scholes formula, as
sample applications.

“

Entanglement degradation in the solid state: interplay of adiabatic and quantum noise. (arXiv:1001.4875v1 [quant-ph]): ”

We study entanglement degradation of two non-interacting qubits subject to independent baths with broadband spectra typical of solid state nanodevices. We obtain the analytic form of the concurrence in the presence of adiabatic noise for classes of entangled initial states presently achievable in experiments. We find that adiabatic (low frequency) noise affects entanglement reduction analogously to pure dephasing noise. Due to quantum (high frequency) noise, entanglement is totally lost in a state-dependent finite time. The possibility
to implement on-chip both local and entangling operations is briefly discussed.

“

Novidades no BIP

Essa semana estreiou no BIP duas novidades. Como estudo Física, tenho que sempre estar atento aos novos artigos (pre-prints) que pesquisadores publicam no arXiv. Então resolvi postar aqui os e-papers mais interessantes e menos técnicos que vou encontrando por lá. Por exemplo, publicarei por aqui links para artigos de revisão, notas de aula etc etc. Esses posts podem ser encontrados na tag “arXiv”.

Outra novidade é que semanalmente postarei aqui o resumo de postagens do BIP no Twitter. Por lá, costumo sempre colocar links de coisas que julgo interessante, a grande maioria relacionado à ciência. Esses posts podem ser encontrados na tag “twitter”. Pra quem quiser me seguir por lá também, o endereço é http://twitter.com/lasleandro.

Até a próxima!

BIP no TWITTER, parte I

Backup file made by TweetBackup 2010-01-23 14:37:50

2010-01-23 14:26:21
lasleandro: Water Planets http://bit.ly/640UET #science

2010-01-23 12:43:12
lasleandro: When Does Science Become Technology And Why Does It Matter? http://bit.ly/6DAmBA #science

2010-01-22 16:32:50
lasleandro: A First Course on Twistors, Integrability and Gluon Scattering Amplitudes. http://bit.ly/8kHeBJ #physics

2010-01-22 16:31:17
lasleandro: The Physical Properties of the Cosmic Acceleration. (arXiv:1001.1811v2 [astro-ph.CO] CROSS LISTED) http://bit.ly/61bULf

2010-01-22 14:16:57
lasleandro: Fotos pioneiras de cristais de neve vão à venda em Nova York http://bit.ly/5W1hNQ

2010-01-22 14:14:45
lasleandro: “Lake Views” by Steven Weinberg http://bit.ly/6xr0rA #physics

2010-01-22 14:12:58
lasleandro: Flying R2-D2, you are doing it wrong http://bit.ly/5l7EOV #physics

2010-01-21 18:18:20
lasleandro: Non-Markovian effect on the geometric phase of a dissipative qubit. http://bit.ly/6GovtL #physics

2010-01-21 18:02:52
lasleandro: Chaos Models in Economics. (arXiv:1001.3492v1 [nlin.CD]) http://bit.ly/4UKPEB

2010-01-21 03:36:13
lasleandro: How to install GNOME Activity Journal in Ubuntu http://bit.ly/8NN8Fv #ubuntu

2010-01-19 03:45:21
lasleandro: para os saudosistas, ICQ ainda vive! versao 7, lançada hoje!! http://tinyurl.com/ydtmrmq

2010-01-18 19:42:58
lasleandro: RT @sspedro: RT: @ComoFunciona: Como funciona a música indie: http://lazer.hsw.uol.com.br/indie.htm

2010-01-18 19:12:29
lasleandro: Physics With Two Time Dimensions. http://bit.ly/69CuTz #hepph

2010-01-18 18:57:23
lasleandro: Quantum Mechanics from Periodic Dynamics: the bosonic case. (arXiv:1001.2718v1 [hep-th]) http://bit.ly/4AwQ1W #hepth

2010-01-18 18:48:18
lasleandro: Theory of Heavy-Ion Collisions. http://bit.ly/6mvf29 #hep-th

A First Course on Twistors, Integrability and Gluon Scattering Amplitudes.

A First Course on Twistors, Integrability and Gluon Scattering Amplitudes. (arXiv:1001.3871v1 [hep-th]): “

These notes accompany an introductory lecture course on the twistor approach to supersymmetric gauge theories aimed at early-stage PhD students. It was held by the author at the University of Cambridge during the Michaelmas term in 2009. The lectures assume a working knowledge of differential geometry and quantum field theory. No prior knowledge of twistor theory is required.

“

The Physical Properties of the Cosmic Acceleration

The Physical Properties of the Cosmic Acceleration. (arXiv:1001.1811v2 [astro-ph.CO] CROSS LISTED): ”

The observed late-time acceleration of the cosmic expansion constitutes a fundamental problem in modern theoretical physics and cosmology. In an attempt to weight the validity of a large number of dark energy models, I use the recent measurements of the expansion rate of the Universe, the clustering of galaxies the CMB fluctuations as well as the large scale structure formation, to put tight constraints on the different models.

“

Particle physics models of inflation and curvaton scenarios.

Particle physics models of inflation and curvaton scenarios. (arXiv:1001.0993v2 [hep-ph] UPDATED): “

We review the particle theory origin of inflation and curvaton mechanisms for generating large scale structures and the observed temperature anisotropy in the cosmic microwave background (CMB) radiation. Since inflaton or curvaton energy density creates all matter, it is important to understand the process of
reheating and preheating into the relevant degrees of freedom required for the success of Big Bang Nucleosynthesis. We discuss two distinct classes of models, one where inflaton and curvaton belong to the hidden sector, which are coupled to the Standard Model gauge sector very weakly. There is another class of models of inflaton and curvaton, which are embedded within Minimal Supersymmetric Standard Model (MSSM) gauge group and beyond, and whose origins lie within gauge invariant combinations of supersymmetric quarks and leptons. Their masses and couplings are all well motivated from low energy physics, therefore such models provide us with a unique opportunity that they can be verified/falsified by the CMB data and also by the future collider and non-collider based experiments. We then briefly discuss stringy origin of inflation, alternative cosmological scenarios, and bouncing universes.

“

Theory of Heavy-Ion Collisions. (arXiv:1001.2452v1 [hep-ph])

Theory of Heavy-Ion Collisions. (arXiv:1001.2452v1 [hep-ph]): ”

In high energy nucleus-nucleus collisions, a transient state of thermalized, hot and dense matter governed by Quantum Chromodynamics is produced. Properties of this state are reflected in the bulk low transverse momentum (P_T) hadron
production which represent the remnant of the collective medium as well as in modifications of so-called probes which are not part of the thermalized medium, i.e. jets generated in high P_T processes or leptons and photons which do not participate in the strong interaction. Theory effords aim at deducing the properties of QCD thermodynamics and collectivity from such observables.

“

Physics With Two Time Dimensions. (arXiv:1001.2485v1 [hep-th])

Physics With Two Time Dimensions. (arXiv:1001.2485v1 [hep-th]):

We explore the properties of physical theories in space-times with two time dimensions. We show that the common arguments used to rule such theories out do not apply if the dynamics associated with the additional time dimension is thermal or chaotic and does not permit long-lived time-like excitations. We discuss several possible realizations of such theories, including holographic representations and the possibility that quantum dynamics emerges as a consequence of a second time dimension.