randy@utcsri.UUCP (Randall S. Becker) (11/10/85)
I am looking for the (a) formula which relates the gravitational intensity about a photon emitting object with the shift in the photons' frequency. Randy -- Randall S. Becker Usenet: ..!utcsri!randy CSNET: randy@toronto
gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) (11/15/85)
> I am looking for the (a) formula which relates the gravitational intensity > about a photon emitting object with the shift in the photons' frequency. Last I heard, the frequency of an emitted photon is independent of the gravitational field at the site of emission, so long as it does not affect the structure of the emitting material, etc. Perhaps you are really interested in the "gravitational red shift"? This describes how the frequency of light that a distant observer sees is affected by the lights travel through an extended gravitational field. That depends very much on the situation. For a very distant observer of light emitted at the surface of, say, a star of radius R and mass m, the observed frequency will be emitted_frequency * sqrt( 1 - 2*k*m/R ), where k is the Newtonian gravtitational constant divided by the square of the speed of light.