• Divergence of ( R + gR )

    Updated: 2011-10-31 11:49:14
    What is the divergence of the quantity ( R + gR ) related to space-time where R is Ricci curvature scalar , g is the determinant of the metric ?

  • Deutsch's algorithm vs classical algorithm

    Updated: 2011-10-31 11:32:58
    How the Deutsch's algorithm outperforms a classical algorithm? In both algorithms we need two particles (two bits and two qubits). In the quantum case the two qubits are processed by the FCNOT gate...

  • Latent Heat of Vaporization /w Temperature

    Updated: 2011-10-31 11:29:46
    Hi, I would like to ask, why is it that the specific latent heat of vaporization of water at, say 10 degrees Celsius, is considerably higher that at 100 degrees Celsius? It would be great if...

  • Why is the nuclear shell model build around single particle motion?

    Updated: 2011-10-31 11:22:09
    Hi everyone For the past few months I have been learning about the nucleus and the nuclear shell model. The experimental evidence for a shell structure is overwhelming and easy to understand....

  • Happy Halloween!

    Updated: 2011-10-31 00:59:13
    I'm at work with the Johnny Depp's Mad Hatter's hat, complete with red hair coming out of the sides and back. But that's nothing compare to the creativity of this costume. Of course, it helps to have...

  • Gauss elimination vs Solution with Inverse

    Updated: 2011-10-31 00:57:46
    *1. The problem statement, all variables and given/known data* Using Octave or Matlab solve random binary matrices(with 1s and 0s) of size N and plot them together. Draw a conclusion. *3. The...

  • proof in predicate calculus

    Updated: 2011-10-31 00:41:08
    Let: 1)P be one place operation 2)K be one place operation 3) c be a constant let :

  • Quantum scale explanation.

    Updated: 2011-10-31 00:38:34
    Hello everyone, thanks for reading. We all know that Quantum mechanics can be "ignored" when working with systems in which the typical distances and energies are big enough (compared to h, or...

  • What is the relationship between debye temperature and phonons?

    Updated: 2011-10-31 00:09:32
    What is the relationship between debye temperature and phonons?

  • 6th Australasian Conference on General Relativity and Gravitation

    Updated: 2011-10-30 10:04:53
    The Sixth Australasian Conference on General Relativity and Gravitation (ACGRG6) will be held in New Zealand’s premier mountain resort: Queenstown in the South Island, from the 8th to the 11th of February 2012. The conference brings together researchers in general relativity (mathematical/theoretical/numerical), theoretical and observational cosmology, relativistic astrophysics and gravitational wave detection. It is hosted by [...]

  • PBS Explores Fabric of the Cosmos in November

    Updated: 2011-10-30 08:00:16
    This November, the PBS science series NOVA will tackle some of the most fundamental concepts of the universe. Together with theoretical physicist Brian Greene, the series will present a 4-part ...Read Full Post

  • Two More Big Bang Episodes

    Updated: 2011-10-29 19:08:26
    We continue our coverage of new episodes from CBS' sitcom The Big Bang Theory, including coverage of their Halloween-themed episode, "The Good Guy Fluctuation." There's some great physics that came up in the last couple of episodes, including some Halloween-related science....Read Full Post

  • Relativity and Gravitation – 100 Years after Einstein in Prague (2nd announcement)

    Updated: 2011-10-29 12:57:29
    The conference is organized at the occasion of the 100th anniversary of Albert Einstein’s stay in Prague, with the aim of providing an overview of the development and progress achieved in general relativity and its applications since then. The main topics of the conference include: * Mathematical relativity * Numerical relativity * Relativistic astrophysics * Relativistic cosmology * Quantum gravity * Gravitation [...]

  • Scientists still seek explanation for faster-than-light neutrino result

    Updated: 2011-10-28 12:24:30
    The question of whether the OPERA experiment's faster-than-light neutrino measurement is correct is still up in the air, despite what some headlines have suggested. Experimentalists have not been able to establish how the experiment is flawed, and yet theorists have not been able to determine how its conclusion could be true.

  • Podcasts of Physics

    Updated: 2011-10-27 23:24:12
    Home Education Physics Physics Search Physics Basic Concepts Theories Experiments Share Free Physics Newsletter Sign Up Discuss in my forum Podcasts of Physics By Andrew Zimmerman Jones About.com Guide October 27, 2011 My Bio Headlines Forum RSS I first began listening to podcasts back when I got an iPad shortly after they came out . I was expecting that the new iOS5 release , which allows you to go completely wireless and avoid synching with iTunes on the computer , would also make it possible to synch podcast episodes wirelessly . Somehow , the company which created the iPod and thus was the source of the term podcasting missed this in their massive . upgrade So I've switched over to listening to podcasts on my Android smartphone . I've looked into a couple of apps for this : Stitcher

  • Time and Quantum Mechanics Page not found

    Updated: 2011-10-27 04:38:52
    Time and Quantum Mechanics Exploring the intersection of time and quantum mechanics Home About References Overview Not Found Sorry , you are looking for something that isn't . here Subscribe Entries RSS Comments RSS Search Pages About Overview References Blogroll A User's Guide to the Universe CERN Cosmic Variance Entertaining Research Magic Blue New Scientist The Physics arXiv Blog TierneyLab University of Pennsylvania Wired Science Conferences 4th Feynman Festival The Clock and the Quantum Third International Conference on the Nature and Ontology of Spacetime Contest FQXi FORUM : The Nature of Time Essay Contest Papers Quantum time dissertation Relativistic Morlet Wavelets Persons H . Dieter Zeh Huw Price Julian Barbour Paul Halpern Paul J . Nahin Victor Stenger Y . S . Kim Talks Five

  • Goddard Engineering Colloquium Announcement

    Updated: 2011-10-27 04:37:54
    Goddard Space Flight Center , Greenbelt , Maryland 20771 ENGINEERING COLLOQUIUM Monday , March 21, 2011 3:30 PM , Building 3 Auditorium John Ashmead Temporal Paradoxes ABSTRACT Einstein's general relativity is the leading theory of gravity . Simple and elegant , it has passed all available experimental tests including : deflection of light by gravity , precession of orbital apsides , gravitational time dilation used in GPS and frame-dragging . However , general relativity makes a number of counter-intuitive predictions . In particular , trajectories looping around massive , rapidly rotating stars or passing through a wormhole can close on themselves in time , creating closed timelike curves CTCs This creates the possibility of grandfather and bootstrap paradoxes . Recent work by

  • Time and Quantum Mechanics Page not found

    Updated: 2011-10-27 04:37:50
    Time and Quantum Mechanics Exploring the intersection of time and quantum mechanics Home About References Overview Not Found Sorry , you are looking for something that isn't . here Subscribe Entries RSS Comments RSS Search Pages About Overview References Blogroll A User's Guide to the Universe CERN Cosmic Variance Entertaining Research Magic Blue New Scientist The Physics arXiv Blog TierneyLab University of Pennsylvania Wired Science Conferences 4th Feynman Festival The Clock and the Quantum Third International Conference on the Nature and Ontology of Spacetime Contest FQXi FORUM : The Nature of Time Essay Contest Papers Quantum time dissertation Relativistic Morlet Wavelets Persons H . Dieter Zeh Huw Price Julian Barbour Paul Halpern Paul J . Nahin Victor Stenger Y . S . Kim Talks Five

  • What Happened Before The Big Bang

    Updated: 2011-10-27 04:37:49
    Science News Blog Cite Save Email Print Share What Happened Before The Big Bang ScienceDaily July 2, 2007 New discoveries have been made about another universe whose collapse appears to have given birth to the one we live in today . They will be announced in the early on-line edition of the journal Nature Physics on 1 July 2007 and will be published in the August 2007 issue of the journal's print edition . My paper introduces a new mathematical model that we can use to derive new details about the properties of a quantum state as it travels through the Big Bounce , which replaces the classical idea of a Big Bang as the beginning of our universe , quot said Martin Bojowald , assistant professor of physics at Penn State . Bojowald's research also suggests that , although it is possible to

  • Penn State Researchers Look Beyond The Birth Of The Universe

    Updated: 2011-10-27 04:37:48
    Science News Blog Cite Save Email Print Share Penn State Researchers Look Beyond The Birth Of The Universe ScienceDaily May 15, 2006 According to Einstein's general theory of relativity , the Big Bang represents The Beginning , the grand event at which not only matter but space-time itself was born . While classical theories offer no clues about existence before that moment , a research team at Penn State has used quantum gravitational calculations to find threads that lead to an earlier . time See : Also Space Time Big Bang Astrophysics Black Holes Cosmology Space Station Space Probes Reference Multiverse Introduction to general relativity Shape of the Universe Ultimate fate of the universe General relativity can be used to describe the universe back to a point at which matter becomes so

  • The Tevatron: a training ground beyond particle physics

    Updated: 2011-10-25 14:41:00
    Beyond smashing together billions of protons and antiprotons over the course of its 28 years of operations, Fermilab’s Tevatron also served as a launching pad for many careers, often in fields beyond particle physics.

  • SLAC physicists using physics simulation tool to make cancer therapy safer

    Updated: 2011-10-24 22:45:25
    Tiny particles are making a big difference in the world of cancer therapy. And SLAC physicists—experts in particle transport—are using computer simulations to make those therapies safer.

  • Near Field Cosmology as a Probe of Early Universe, Dark Matter and Gravity

    Updated: 2011-10-24 02:17:04
    The Joint Space Science Institute — consisting of astronomers, astrophysicists and physicists from the University of Maryland and NASA’s Goddard Space Flight Center — is planning a cross-cutting workshop on “Near Field Cosmology as a Probe of Early Universe, Dark Matter and Gravity”. We aim to bring together 80-100 scientists from around the world to [...]

  • Living Reviews in Relativity: “Entanglement Entropy of Black Holes”

    Updated: 2011-10-21 14:06:22
    Living Reviews in Relativity has published a new review article on “Entanglement Entropy of Black Holes” by Sergey N. Solodukhin on October 21, 2011. Please find the abstract and further details below. —————— PUB.NO. lrr-2011-8 Solodukhin, Sergey N. “Entanglement Entropy of Black Holes” ACCEPTED: 2011-08-23 PUBLISHED: 2011-10-21 FULL ARTICLE AT: http://www.livingreviews.org/lrr-2011-8 ABSTRACT: The entanglement entropy is a fundamental quantity which characterizes the correlations between sub-systems in [...]

  • This Week’s Hype

    Updated: 2011-10-19 23:37:55
    A couple people have written to tell me about the new BBC Faster Than the Speed of Light? documentary on superluminal neutrinos which evidently featured trademark hype from string theorist Mike Duff about how string theory could explain this. For … Continue reading →

  • String Theory Finds a Bench Mate

    Updated: 2011-10-19 21:17:51
    There’s a nice article this week in Nature about AdS/CMT, entitled String Theory Finds a Bench Mate. According to the article, the whole thing is (partly) my fault: But in 2006, string theory took a public battering in two popular … Continue reading →

  • Welcome to the Multiverse

    Updated: 2011-10-19 20:37:51
    The October issue of Discover magazine has a new feature, a column by Sean Carroll, whose inaugural effort is now on-line as Welcome to the Multiverse. Sean makes the argument that opposition to multiverse mania is due to people having … Continue reading →

  • October 2011 issue of symmetry available

    Updated: 2011-10-19 15:38:25
    This month marks the 50th issue of symmetry magazine, which published its first issue in Oct/Nov 2004. It quickly established its own quirky style with a cover of a little girl in jammies dragging an Einstein bear.

  • New forthcoming relativity books by M. S. Berman

    Updated: 2011-10-19 10:24:36
    “General Relativity and the Pioneers Anomaly” This book is an introduction to the General Relativity Theory (GRT) and to the solution of the Pioneers Anomaly by means of relativistic cosmology, a study that is designed to be understood by undergraduate and graduate students alike in the fields of theoretical physics, applied mathematics and space engineering. In [...]

  • LAGUNA large neutrino observatory design moves forward

    Updated: 2011-10-18 20:00:45
    The kick-off meeting for the second phase of the LAGUNA's design study starts today at CERN. The principal goal of LAGUNA (Large Apparatus for Grand Unification and Neutrino Astrophysics) is to assess the feasibility of a new pan-European research infrastructure able to host the next generation, very large volume, deep underground neutrino observatory. The scientific goals of such an observatory combine exciting neutrino astrophysics with research addressing several fundamental questions such as proton decay and the existence of a new source of matter-antimatter asymmetry in Nature, in order to explain why our Universe contains only matter and not equal amounts of matter and antimatter.

  • Five Episodes of Big Bang Theory Science

    Updated: 2011-10-16 16:53:33
    Last week's review of Season 5, Episode 5 of CBS's geek-driven sitcom The Big Bang Theory is up. This episode had some great physics references, specifically Sheldon using concepts from quantum physics to explain the nebulous status of his friendship with Leonard. Here are the links to the episodes so far, along with some breakdowns of episodes from earlier seasons (more to come, especially now that it's in syndication):...Read Full Post

  • Postdoctoral Researcher/Senior Postdoctoral Researcher at LSU

    Updated: 2011-10-14 22:19:19
    The theoretical relativity group expects to have (contingent on funding) an opening for a postdoctoral researcher or senior postdoctoral researcher to start July 2012. This position conducts research in loop quantum gravity including either the canonical or spin foam approaches and/or loop quantum cosmology. The initial appointment will be for one year and is expected [...]

  • Bubble chamber gets more precise in dark matter search

    Updated: 2011-10-14 17:12:44
    The 1970s were a thriving time in the world of physics, heralding such milestones as the development of the Standard Model and the discovery of the bottom quark. Now scientists at Fermilab are bringing some experimental pieces of that era back – bubble chambers and fixed-target physics. Peter Cooper, a Fermilab physicist, is heading a new experiment calibrating the classic bubble chamber technology, which is used today to search for dark matter.

  • Postdoctoral position in general relativity at Cornell University

    Updated: 2011-10-14 14:04:28
    Cornell University expects to have an opening for a postdoctoral associate in general relativity starting in September, 2012. The position is for one year, with subsequent renewals depending on performance and the availability of funds. The Cornell Relativity Group consists of faculty members Eanna Flanagan and Saul Teukolsky, senior research associate Larry Kidder, research associates [...]

  • Gamma-ray telescope designer awarded 2012 Panofsky Prize

    Updated: 2011-10-13 16:46:24
    William Atwood, a leading member of the Fermi Gamma-ray Space Telescope collaboration, will receive the 2012 W. K. H. Panofsky Prize in Experimental Particle Physics from the American Physical Society for his work as co-designer of the Large Area Telescope, the main instrument on Fermi, and for using the LAT to investigate the universe in gamma rays.

  • Science Explained in Four Big Bang Episodes

    Updated: 2011-10-11 15:26:26
    Home Education Physics Physics Search Physics Basic Concepts Theories Experiments Share Free Physics Newsletter Sign Up Discuss in my forum Science Explained in Four Big Bang Episodes By Andrew Zimmerman Jones About.com Guide October 11, 2011 My Bio Headlines Forum RSS We're four episodes into this season of CBS' award-winning sitcom The Big Bang Theory This season hasn't been the most hilarious or science-filled of them all , at least so far , but they've been consistently entertaining . As promised , we've been tracking and explaining the science referenced in these episodes , from drug trials to the Large Hadron Collider to model trains Here are the first four , as well as links to some of the earlier : seasons Episode 1 The Skank Reflex Analysis Episode 2 The Infestation Hypothesis

  • Postdoctoral Researchers in Theoretical Physics at Perimeter Institute

    Updated: 2011-10-04 21:51:40
    Applications are now open for postdoctoral fellowships at Perimeter Institute (PI) to begin in Fall 2012. PI hosts the world’s largest group of independent postdoctoral fellows in foundational theoretical physics. At PI, Postdoctoral Fellows are encouraged to formulate and pursue their own chosen lines of research, across all fields of theoretical physics, within an exceptionally [...]

  • New focus issue on string cosmology free to read in CQG

    Updated: 2011-10-04 14:56:04
    Dear Colleagues, We are delighted to announce that the new Classical and Quantum Gravity (CQG) focus issue on string cosmology is now free to read online. http://iopscience.iop.org/0264-9381/28/20 This issue includes 10 specially invited papers from some of the top researchers in the field. Guest Edited by Dr Vijay Balasubramanian and Professor Paulo Moniz, the focus issue appraises recent applications [...]

  • Postdoctoral position in Cosmology/Astroparticle Physics at Physics Dept. “G.Galilei” Padova and INFN Padova (Italy)

    Updated: 2011-10-04 09:51:37
    The INFN PD51 research group leading the Cosmology/Astroparticle program Inflation, Dark Matter and the Large-Scale Structure of the Universe announces one postdoctoral position in Cosmology and Astroparticle Physics, to begin in Fall 2012. The position will be a 1 + 1 year appointment and reserved for non-italian citizens. The post-doc research activity will be mainly [...]

  • 2011 Nobel Prize to Dark Energy!

    Updated: 2011-10-04 06:51:58
    Home Education Physics Physics Search Physics Basic Concepts Theories Experiments Share Free Physics Newsletter Sign Up Discuss in my forum 2011 Nobel Prize to Dark Energy By Andrew Zimmerman Jones About.com Guide October 4, 2011 My Bio Headlines Forum RSS The 2011 Nobel Prize in Physics has been awarded for the discovery of the accelerating expansion of the Universe through observations of distant supernovae with one half to Saul Perlmutter and the other half jointly to Brian P . Schmidt and Adam G . Riess . These scientists were the key researchers involved in the two 1998 independent research groups that discovered that expansion was accelerating , a phenomenon more commonly called dark energy It's very rare for the Nobel Prize to be given for something , like dark energy , which can

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