quantum gravity

Welcome to the 'quantum gravity' tag page at Technorati. This page features content from the farthest reaches of the Blogosphere that authors have "tagged" with 'quantum gravity'.

Latest blogosphere posts tagged “quantum gravity”

• String Theorist Turns to Emergent Gravity Approach

  
  Guide to Reality — Authority: 105
  Inspired by phase transitions displayed in condensed matter physics, Petr Hořava has constructed a model where the time dimension is decoupled from space at high energy/short distance while the space-time characteristic of relativity (and Lorentz invariance) emerges at low energy/long distances. The model, which is ...
  4 days ago

• Scientific American about Hořava gravity

  
  The Reference Frame — Authority: 616
  As I learned from seeing hundreds of visitors to various articles about Hořava-Lifshitz gravity  on this blog, Zeeya Merali wrote an article for Scientific American , Splitting time from space — new quantum theory topples Einsteins spacetime. Holy crap, the title sounds bad, doesnt it? And the rest of the ...
  6 days ago

• Holography: unitarity implies chronology protection

  
  The Reference Frame — Authority: 616
  Previous article about the topic: Time travel: reality and myths Closed time-like curves lead to all kinds of problems with causality: no one knows whether you can kill your grandparents before they met and what should happen if you kill them. Remotely related: 30 neat new hi-res pictures from the LHC However, ...
  1 week ago

• An anti-inflation paper by Brian Greene et al.

  
  The Reference Frame — Authority: 616
  The world must be coming to an end, indeed. :-) Brian Greene, Kurt Hinterbichler, Simon Judes, and Maulik K. Parikh wrote a preprint called Smooth initial conditions from weak gravity ( PDF ) which claims that inflation doesnt solve the smoothness problem and that offers an extremely awkward solution - more ...
  4 weeks ago

• Chasing the Dragon, by Justina Robson

  
  Adventures in Reading — Authority: 461
  Chasing the Dragon Justina Robson Pyr: 2009 Chasing the Dragon has that “middle book” feel to it that even the second and third Quantum Gravity books did not have. Each of the previous volumes had complete stories which also built upon the one before it. Chasing the Dragon has a story entirely dependant ...
  4 weeks ago

• News on Garrett Lisi’s E8 theory

  
  Theorema Egregium — Authority: 93
  Lisi posted this yesterday over at Physics Forums; I reproduce here:Hello PF folk.If you believe the Dirac equation in curved spacetime, and you believe Spin(10) grand unification, then a Spin(3,11) GraviGUT, acting on one generation of fermions as a 64 spinor, seems… inevitable.Also, it’s pretty.And it’s up to ...
  5 weeks ago

• Nature, NYT report the demise of Lorentz-violating theories

  
  The Reference Frame — Authority: 616
  In August 2009, we discussed the preprint by the GBM/LAT collaborations working for Fermi, formerly known as GLAST: Fermi kills all Lorentz violating theories , which has ruled out all existing non-stringy theories of quantum gravity by confirming the rules of special relativity at a huge, trans-Planckian accuracy - ...
  5 weeks ago

• A small Hodge three-generation Calabi-Yau

  
  The Reference Frame — Authority: 616
  I think that the most interesting - and visually attractive - hep-th paper today is the last one, Volker Braun, Philip Candelas, Rhys Davies : A three-generation Calabi-Yau manifold with small Hodge numbers ( PDF ). They construct Calabi-Yau manifolds with very small Hodge numbers. If you look at the picture ...
  5 weeks ago

• A composite image of GRB 090423

  
  Ars Technica — Authority: 740
  One of the awkward aspects of modern physics is that its two most successful fields, relativity and quantum mechanics, are fundamentally incompatible, as things happen in the quantum world that relativity says should not be possible. Thats left physicists looking for a way to harmonize the two, with two primary ...
  5 weeks ago

• What if we unassume?

  
  scotchneat.ca — Authority: 114
  My last (and the final) lecture at Q2C: Fotini Markopoulou ’s “ Creating Spacetime “. (And yes, I wonder how many times she’s heard a Marco Polo joke…). Maropoulou is a founding member of PI, and a theoretical physicist whose current interest in quantum gravity, and more particularly, how can we get out ...
  5 weeks ago

• Quantum Gravity quote

  
  Theorema Egregium — Authority: 93
  A pessimist might say that combining string theory and loop quantum gravity is like combining epicycles and aether. (John Baez, TWF281)
  5 weeks ago

• Guardian: interview with Michael Green

  
  The Reference Frame — Authority: 616
  Aida Edemariam of The Guardian just published an interesting albeit imperfect interview with the new Lucasian professor  of mathematics in Cambridge: Michael Green: Master of the universe (click) It argues that Green, who has been focused on theoretical physics since the age of 13, used to be a Harrison Fords ...
  5 weeks ago

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