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Thread: light orbiting the photon sphere

  1. #1
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    light orbiting the photon sphere

    Does anything happen to light as it travels in the photon sphere. Are any properties changed?
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  2. #2
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    if it were possible for light to orbit there, I would guess it would have be emitted at the photon sphere, eg by a hot piece of metal falling through it...
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  3. #3
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    Quote Originally Posted by Mudskipper View Post
    if it were possible for light to orbit there, I would guess it would have be emitted at the photon sphere, eg by a hot piece of metal falling through it...

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  4. #4
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    Mudskipper's answer is exactly correct. It almost certainly is not
    actually possible for light to make a full orbit in the photon sphere
    because the slightest deflection upward or downward would cause
    it to leave the sphere. If it *were* possible, being emitted in the
    photon sphere by matter falling through the sphere is the only
    reasonably plausible way it could be injected into the sphere.
    A Rube Goldberg arrangement of gravitational perturbations can
    be imagined in which light might be emitted outside the photon
    sphere and then maneuvered into the sphere, but is so unlikely
    that one would reasonably guess that it never actually happens.
    Of course, there is no way for anyone to know for sure.

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  5. #5
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    Theoretically, if a photon could travel through the photonsphere, would it always remain the same, or would it change?
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  6. #6
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    No reason it would change in the photon sphere any more than it would change if it spent the same amount of time in intergalactic space.

    Grant Hutchison
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  7. #7
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    Quote Originally Posted by grant hutchison View Post
    No reason it would change in the photon sphere any more than it would change if it spent the same amount of time in intergalactic space.

    Grant Hutchison
    Thanks Grant!
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