Anonymous
9/15/2025, 5:49:41 PM
No.16786044
>>16786012
This, in the case of cosmological redshift. If expansion of space reduces the energy of a photon, then the lengthening of a photon's wavelength must dive the expansion of space. Essentially photons can be understood to exert pressure to spacetime
Gravitational redshift/blueshift is an exchange in the kinetic and potential energy of the photon; climbing out of a gravitational well, a photon loses energy, much like a particle with non-zero rest mass would, even if it keeps travelling at c.
Redshift/blueshift due to relative motion can be similarly explained as one explains the kinetic energy of any object
This, in the case of cosmological redshift. If expansion of space reduces the energy of a photon, then the lengthening of a photon's wavelength must dive the expansion of space. Essentially photons can be understood to exert pressure to spacetime
Gravitational redshift/blueshift is an exchange in the kinetic and potential energy of the photon; climbing out of a gravitational well, a photon loses energy, much like a particle with non-zero rest mass would, even if it keeps travelling at c.
Redshift/blueshift due to relative motion can be similarly explained as one explains the kinetic energy of any object