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Thread: Energy and Gravity?

  1. #1 Energy and Gravity? 
    Forum Senior Booms's Avatar
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    Mass has gravity, as far as we know completely unhindered by anything and everything, each electron has a nonzero gravitational pull on every other electron in the universe


    does Energy (light/radio waves etc) have a similar gravitational force?


    It's not how many questions you ask, but the answers you get - Booms

    This is the Acadamy of Science! we don't need to 'prove' anything!
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  3. #2  
    Forum Radioactive Isotope MagiMaster's Avatar
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    Yes. AFAIK, light and energy do curve space as well. E=mc^2 and all that.


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  4. #3  
    Reptile Dysfunction drowsy turtle's Avatar
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    Energy and mass are interchangable, so if a particle has energy, it also has mass. Electromagnetic radiation is affected by gravity, which is why a black hole has an event horizon.
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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  5. #4 Re: Energy and Gravity? 
    . DrRocket's Avatar
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    Quote Originally Posted by Booms
    Mass has gravity, as far as we know completely unhindered by anything and everything, each electron has a nonzero gravitational pull on every other electron in the universe


    does Energy (light/radio waves etc) have a similar gravitational force?
    Yes, but you need to be careful.

    In GR gravity is the result of curvature of spacetime and that curvature is determined by the stress-energy tensor.

    Elements of that tensor include density of mass/energy, momentum and pressure, This tensor is an invariant, and is independent of the observer, so it is a bit more complicated than just finding mass from and plugging it into the Newonian .

    Not only does energy cause curvature, gravitational energy also causes curvature, and hence gravity gravitates.

    http://en.wikipedia.org/wiki/Stress-energy_tensor
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