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Thread: Holographic universe/black hole

  1. #1 Holographic universe/black hole 
    Forum Junior
    Join Date
    Feb 2014
    Hi everyone,
    It is my understanding that the theory of the holographic universe is based on black holes physics. So in that theory, is the univers a black hole?
    If that's the case, is our universe supposed to evaporate like a normal black hole in a larger space-time?
    I don't think the horizon considered in the holographic universe theory is the cosmological horizon ( sphere where space is receding at the speed of light ), but really a black hole horizon.
    I am a bit confused about that.
    I don't know if anyone would have understood that better than me.
    Thank you.

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  3. #2  
    Forum Professor Daecon's Avatar
    Join Date
    Jul 2013
    New Zealand
    Almost, but not quite.

    The holographic principle is based on Black Hole Thermodynamics, which is a subtly different.

    Personally, while I also know very little about it, I found this Wikipedia article on the Holographic Principle very informative.

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  4. #3  
    Forum Junior
    Join Date
    Feb 2014
    Hi Daecon,
    Thanks for the link. The holographic universe theory seems to be only inspired by BH physics.
    The holographic principle states that the entropy of ordinary mass (not just black holes) is also proportional to surface area and not volume; that volume itself is illusory and the universe is really a hologram which is isomorphic to the information "inscribed" on the surface of its boundary.
    The surface seems to be the cosmological horizon:
    In a larger sense, the theory suggests that the entire universe can be seen as a two-dimensional information structure "painted" on the cosmological horizon, such that the three dimensions we observe are an effective description only at macroscopic scales and at low energies. Cosmological holography has not been made mathematically precise, partly because the cosmological horizon has a finite area and grows with time
    What I don't understand with that is that each point in the universe has its own cosmological horizon, so how could the entire universe be the hologram of a single surface?
    Also, each point of the universe is on the cosmological horizons of all the points located on a surface on its own cosmological horizon, so how can that point encode the information of another single point??
    I don't get it...
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