- #1
SteveDC
- 39
- 0
As I understand a photon has zero rest mass (as far as we can tell) but it does have a passive gravitational mass in order for it to be able to respond to gravity.
But I've been shown that passive gravitational mass should be equal to active gravitational mass, and if this is true and photons have active gravitational mass then is it the case that a beam of light will have its own gravitational field? So would two beams of parallel light in an empty Universe (i.e. no gravity from other objects) be drawn to each other?
But I've been shown that passive gravitational mass should be equal to active gravitational mass, and if this is true and photons have active gravitational mass then is it the case that a beam of light will have its own gravitational field? So would two beams of parallel light in an empty Universe (i.e. no gravity from other objects) be drawn to each other?