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Thread: Black holes, Dumb holes and accelerating EoS

  1. #1 Black holes, Dumb holes and accelerating EoS 
    Forum Professor leohopkins's Avatar
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    I have been running this through my mind as a though experiment...when considering that a dumb hole is one where the fluid is moving faster than the speed of sound, so then in a black hole space is falling inwards at faster than the speed of light. We know that gravity exists as a field and it is understood that fields have an associated particle; in which case Gravity's associated field would be the graviton. Light\Photon's cannot escape the black hole, but Graviton's must be able to escape their own effect, else there would be a point where the gravitational field would become locked and would have no further effect outside the event horizon.

    Also consider this....let's say you have a piece of soft foam and you take measurement of the surface area. If you now place a marble or some other heavy object on top, it will dent the foam, and this is the effect of a gravitational field...and although the efects of the dent will be seen to be dramatic very locally to the object, the rest of the foam will also stretch, so if you were to take measurement again the surface area would have increased.

    If you have a BH, a point where space is falling inwards constantly and more rapidly than the speed of light, then surely this is going to expand the surface area of the foam (space) to a much greater degree......add all of the BH's that are stretching the fabric of space with their gravity, then could this not account for dark energy...the explanation as to why space appears to be expanding more and more rapidly as more and more BH's are being created by dying stars. ?


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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by leohopkins View Post
    Iso then in a black hole space is falling inwards at faster than the speed of light.
    Are you thinking of this model:
    Physically, the Gullstrand-Painlevé metric describes space falling into the Schwarzschild black hole at the Newtonian escape velocity. Outside the horizon, the infall velocity is less than the speed of light. At the horizon, the velocity equals the speed of light. And inside the horizon, the velocity exceeds the speed of light.
    Waterfall

    We know that gravity exists as a field and it is understood that fields have an associated particle; in which case Gravity's associated field would be the graviton. Light\Photon's cannot escape the black hole, but Graviton's must be able to escape their own effect, else there would be a point where the gravitational field would become locked and would have no further effect outside the event horizon.
    If there are such a thing as gravitons (currently unknown as we don't have a theory of quantum gravity) then the gravitational force would be carried by virtual gravitons which are not restricted in the way you say - in the same way that a charged black hole has an electric field mediated by virtual photons.

    If you have a BH, a point where space is falling inwards constantly and more rapidly than the speed of light, then surely this is going to expand the surface area of the foam (space) to a much greater degree......add all of the BH's that are stretching the fabric of space with their gravity, then could this not account for dark energy...the explanation as to why space appears to be expanding more and more rapidly as more and more BH's are being created by dying stars. ?
    I think you are carrying the analogy of space as a material falling into a black hole, too far.


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