- #1
binbagsss
- 1,266
- 11
I'm looking at 'Lecture Notes on General Relativity, Sean M. Carroll, 1997'
Link here:http://arxiv.org/pdf/gr-qc/9712019.pdf
Page 221 (on the actual lecture notes not the pdf), where it generalizes that the energy-momentum tensor for radiation - massive particles with velocities tending to the speed of light and EM radiation- can be expressed in terms of the field strength.
So it says that at such speeds , the particles become indistinguishable from the speed of light as far as the equation of state is concerned.
My Question:
How are the energy-momentum tensor and equation of state related? How does it follow from this fact that the energy-momentum tensor of the particles takes the same form as photons do?
Thanks in advance.
Link here:http://arxiv.org/pdf/gr-qc/9712019.pdf
Page 221 (on the actual lecture notes not the pdf), where it generalizes that the energy-momentum tensor for radiation - massive particles with velocities tending to the speed of light and EM radiation- can be expressed in terms of the field strength.
So it says that at such speeds , the particles become indistinguishable from the speed of light as far as the equation of state is concerned.
My Question:
How are the energy-momentum tensor and equation of state related? How does it follow from this fact that the energy-momentum tensor of the particles takes the same form as photons do?
Thanks in advance.