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Re: Light And Gravity

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Posted by Need power? on March 2, 2000 20:36:42 UTC

: : : : : : One week ago, Pranov said:"There will be a redshift due : : : to the gravitational field, but the photon cannot lose : : : speed as it travels with the speed of light.

: : That's only true in special relativity. In general relativity that's only true when measured locally i.e. when the light is close to the clock which is timing it.

: : : First of all, I will say that I'm not an expert on this field, and my knowledge of general relativity is limited, though I know special relativity. : According to that theory velocity of light is constant, and should therefore be able to escape.

: I was given an answer to my question, which stated that an external observer would not see anything escape, because of timedilation in the gravitational field, and that explanation, although a bit abstract from a physical point of view, is correct in general relativity. : But i still can't imagine how the situation will be from the photons (or particle with sufficiently high energy) point of view, as it travels through the event horizon and back during a (measured by the photon) finite time.

If something moves, it need some starting-power.

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