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extradimension

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    What if spacetime has an extra spatial dimension that is large?

    in Trash Can

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    Would physics break?
    It would allow separate frames of reference to scale ..we know it is doing this because the speed of light is the same in time dilation volumes. Gravitational waves fluctuate the scale of reality as they pass. It could make cosmic voids expand and black holes contract.
     
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    Four LARGE spatial dimensions means anything that spreads out 'spherically' will follow an inverse cube law, not an inverse square law.

     

    This is interesting because I think it explains how a black hole is started. A giant star collapses in on itself into the 4th dimension using the inverse cube law. You would need the force of a collapsing star to interact with the fourth dimension.
     
    What does the information paradox say about matter being sent to a 4th dimension? If a black hole is partially 4D ..that would be hard evidence that it is there. Do cosmic voids have something to do with 4D? It seems when a volume doesn't have mass ..the 4d spatial spacetime is collapsing in on itself to cause voids to expand?
     
    Is gravity considered weak because mass from 3D objects that we can interact with and see is barely anything to a 4D spatial spacetime fabric? A black hole would be 4D mass and spacetime would do the opposite of cosmic voids.
     
    Is Dark Matter, 4D mass?
    If Dark Matter is in the 4th dimension ..how was it distributed? Were supermassive black holes involved?
    Were galaxy volumes predetermined by 4D mass?
     
    I think gravitational waves occur in the 4th dimension, so that means there are two ways for us to interact with it. The force of a collapsing star and events that produce gravitational waves. Gravitational waves warp spacetime in the same way time dilation happens.
    Would this extra dimension give us a different view of the big bang?
     
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    The gravitational force of a point mass drops off as 1/r2 . As Sean stated above, this becomes 1/r{2+N} where N is the number of extra dimensions you are adding to a theory. In layman's terms this is because there are now more dimensions for the force to operate in, so the amount of force is more "spread out" for a given distance away.

     

    The gravitational force originates from the extra dimension ..it was already "spread out" before the test.
     
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    Doesn't matter, we already know that since the inverse-square law holds for masses we can test here (down to ~1mm) then there can't be another large dimension similar to ours holding other matter influencing us.

     

    No, it doesn't say that.
    Inverse-square is for 3D masses. 4D mass is dark matter ..it isn't influencing us except bending spacetime.
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