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Gravity Leaking = Dark energy increasing

  1. Jan 12, 2009 #1
    Hello everybody, I am new to this forum and cosmology in general.

    My knowledge about cosmology and astro-physics is rudimentary :shy: so guys cut me some slack.

    From the limited information I know , I feel that phenomenon of gravity leaking might be related to the phenomenon of the expanding universe i.e Increase in dark energy.

    As the laws of Thermodynamics state that energy can neither be created nor destroyed , it can be converted into one form or the other and the total amount of energy in A universe always remains constant, combined with the fact that several scientists believe in the existence of parallel universes, can it be that since gravity in our universe is leaking ( or in my understanding getting weaker) that in an another parallel universe, gravity might be getting stronger or dark energy might be decreasing?

    So guys am i interpreting this correctly or even asking the right questions or am i totally offbase?
  2. jcsd
  3. Jan 12, 2009 #2

    Vanadium 50

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    I have a feeling it's the latter, I'm afraid. I've never heard of gravity leaking, and you can have an expanding universe without dark energy.
  4. Jan 13, 2009 #3


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    There is no inmediate - or intuitive - link between leaking of gravity and accelerated expansion. Leaking of gravity will arise in models of a 3D-brane embedded in 5D spacetime, with afaik some general assumptions about the quantum behavior of gravity. However, for cosmological models derived from those models, there are several mathematical conditions that must met in order to have accelerated expansion - that basically depend on how the 3D brane is embedded in 5D spacetime, the relation between Planck scales on 4 and 5 spacetime dimensions, and the late-time Hubble parameter. See for example hep-th/0010186.
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