Constancy of speed of light in GR
67127
Does the speed of light vary in non-inertial frames?
47242
Time dilation due to change in speed
132106
Why does the speed of light $c$ have the value it does?
96456
General Relativity Equivalence
45953
How can I explain the scientific basis of the constant speed of light to a $c$-decay proponent?
37024
Textbook on the Geometry of Special Relativity
23729
Four-velocity in General-relativistic geodesic equation
7618
What is the speed of light relative to?
57773
About the speed of light and gravity
81350
Is there a Cosmic Gravitational Background Radiation (CGBR)?
81663
Why does gravity travel at the speed of light?
94782
General relativity (gravitation) in time and one spatial dimension
54857
The wave equation in general relativity, special relativity, and Cartesian coordinates
112264
Cosmological constant doubts
149674
Kinetic energy of a photon and Schwarzschild radius
17218
Open problems in General Relativity
19850
Why is the speed of light defined as 299792458 m/s?