- #1
phoenix-anna
- 11
- 6
- TL;DR Summary
- Looking for an explanation of the curved path of light as it passes the sum
Trying to understand how Einstein predicted the appearance of stars during the solar eclipse around the turn of the 20th century (the first experimental confirmation of General Relativity, I believe). My impression, which is not physically correct, is that the sun attracts the photons as they pass by, causing their trajectory to bend. Actually, in GR there is no such thing as gravitational force, right? It is a matter of curvature. I understand that particles with mass follow geodesics, paths where the length (using the relativistic metric, I assume) is minimal. HOwever, I don't believe that GR treats photons as particles having mass but rather treats light as electromagnetic radiation. So that brings me to my question: what is relativity's explanation for the shift in the apparent position of these stars? What is the status of electromagnetic radiation in GR?
My confusion is amplified by my impression that in relativity, light always travels a light-like path where the length is zero: s^2=c^2 t^2-x^2=0
My confusion is amplified by my impression that in relativity, light always travels a light-like path where the length is zero: s^2=c^2 t^2-x^2=0