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Thread: Fabric of Spacetime Is Gravity

  1. #1 Fabric of Spacetime Is Gravity 
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    Since Einstein wrote:
    "this requirement of general covariance... takes away from space and time the last remnant of physical objectivity" - The Foundation of the GTR
    And:
    "In a consistent theory of relativity there can be no inertia relatively to "space" but only an inertia of masses relatively to one another." - Cosmological Considerations of the GTR

    Why is everyone talking about Einstein explaining gravity by "distortions" and "curvature" of "the spacetime fabric"? Where did he do this?

    Now, ordinarily, it is gravity that pulls a ball down an ordinary slope. Here gravity is a force. When, extraordinarily as in words, the gravity of a heavy object causes the "sloping" of the "spacetime fabric", what force causes the lighter object to go "down" the "slope"? Unless, there is a force that causes the lighter object to go down the "slope", then the analogy of a "trampoline-like" "space fabric" is useless.

    The retrogression of the idea of "the fabric of spacetime" is that it reasserts the Absolute Space and Absolute Time of Newton's philosophy/theology as the twin Absolute SpaceTime, a fabric, no less. (And all this after the demise of the ether!) Newton, himself, promptly dropped Absolute Space and Absolute Time at the outset of his science! He stated that only Relative Time and Relative Space were important to his science and all practical measurements.

    Now if there is no time, space, or spacetime that exists physically, not counting the radiation of stars, what is the nature of inter-galactic regions, for example? Here, one needs to extend the concept of matter beyond Einstein's. For Einstein, matter is everything apart from gravity. However, this distinction appears suspicious as gravity, like all forms of Einsteinian matter (including light), has energy that acts gravitatively. So gravity by all accounts is a "type" of Einsteinian matter.

    Thus, there is no space and there is no spacetime, there is gravity always. This gravity is not isotropic, but may be described, as all smoothly continuous extended objects, by its internal (Ricci) curvature and metric.

    Gravity determines geodetic world lines which are the 4D loci of bodies that are freely falling. (This imagery of lines are of course analogies as in magnetic lines of force and are useful in visualizing the anisotropy and directionality of energetic fields. ) There is no "bending" of "the spacetime fabric".

    Next time, about "time".


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  3. #2 Re: Fabric of Spacetime Is Gravity 
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    Quote Originally Posted by caredwood
    Since Einstein wrote:
    "this requirement of general covariance... takes away from space and time the last remnant of physical objectivity" - The Foundation of the GTR
    And:
    "In a consistent theory of relativity there can be no inertia relatively to "space" but only an inertia of masses relatively to one another." - Cosmological Considerations of the GTR

    Why is everyone talking about Einstein explaining gravity by "distortions" and "curvature" of "the spacetime fabric"? Where did he do this?
    He did it in the formulation of general relativity which relates the stress-momentum tensor to the Einstein curvature tensor.

    That is pretty much what general relativity is all about.


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  4. #3  
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    This would be true if you could exit the universe, is Null at the end of the universe or outside of it?
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  5. #4  
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    You can’t exit the universe, why do you think we’re on earth.
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  6. #5  
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    didn't Einstein change his views later on regarding the composition of the universe???

    recently IIRC some physicists have concluded that the universe is a solid? Is this true? I will find a reference if anyone needs it i wouldn't mind finding out more....

    The thing that gets me is in the standard model of matter and void the problem with void is that it is both infinite as well as finite - so it is in effect equidistant at all points - quite a paradox!!!
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  7. #6  
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    As late as 1952 Einstein wrote: "[In GTR,] Space-time does not claim existence on its own, but only as a structural quality of the [gravitational] field." Relativity and the Problem of Space, Albert Einstein (1952).

    So, how and when did a "quality" become a "fabric". Quality -> Thing as in Heat -> Fluid?

    Does the concept of 'spacetime fabric' advance or retard scientific understanding?
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