Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

*Hidden Phase Space* at the Holo Cosmo corral (Verlinde video)

  1. Jun 27, 2011 #1

    marcus

    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    Erik Verlinde gave this great talk at Perimeter on Wednesday last week, which is online as video. It was at a recent Holo Cosmo workshop they had there
    http://pirsa.org/C11010

    It is a very exciting talk. He is actively grasping for what many people dream about: a concrete way to think of geometry and matter as the same thing---just different aspects of "it".
    Geometry and matter growing up from the same hidden phase space roots.

    And he has ideas of how both inertia and the gravitational force arise.

    http://pirsa.org/11060065/
    The Hidden Phase Space of our Universe
    Erik Verlinde
    By combining insights from black holes and string theory we argue for the existence of a hidden phase space associated with an underlying fast dynamical system, which is largely invisible from a macroscopic point of view. The dynamical system is influenced by slow macroscopic observables, such as positions of objects. This leads to a collection of reaction forces, whose leading order Born Oppenheimer force is determined by the general principle that the phase space volume of the underlying system is preserved. We propose that this adiabatic force is responsible for inertia and gravity. This fact allows us to calculate the hidden phase space volume from the known laws of inertia and gravity. We find that in a cosmological setting the appearance of dark energy is naturally explained by the finite temperature of the underlying system. The adiabatic approximation that leads to the usual laws of inertia and gravity breaks down in the neighborhood of horizons. In this regime the reaction force degenerates into an entropic force, and the laws of inertia and gravity receive corrections due to thermal effects. A simple estimate of these effects leads to the conclusion that they coincide with observed phenomena attributed to dark matter.
    Date: 22/06/2011 - 9:00 am
     
    Last edited: Jun 27, 2011
  2. jcsd
  3. Jun 30, 2011 #2
    I'm bandwidth disadvantaged and can't watch this video, which indeed sounds interesting, if not provocative. Can someone who has watched it (or even someone who hasn't) clarify for me what could be meant by:

    .

    It's interesting to see a tool of physical chemistry (Born-Oppennheimer approximation stuff) making an appearance here.

    Or, in the opinion of the knowledgable folk who post in this forum, is this all just microverse madness, perhaps a bit like the "multiverse madness" often denigrated by Peter Woit?

    Of course, once the door has been opened to using the tool of curved spacetime to successfully describe macroscopic gravity, there is no knowing what in the way of strange geometries described by non-Riemannian distortions could lurk in the microverse now described by the Standard Model. Moibus topologies and Volterra disclinations, perhaps. Perhaps geometry is a more a multi-tool than we think.
     
    Last edited: Jun 30, 2011
  4. Jul 1, 2011 #3
    Last edited by a moderator: Apr 26, 2017
  5. Jul 1, 2011 #4

    MTd2

    User Avatar
    Gold Member

    Gravity is a diabetic force.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: *Hidden Phase Space* at the Holo Cosmo corral (Verlinde video)
  1. Verlinde's gravity basics (Replies: 104)

Loading...