# photon domination

26 May 2021Can you show that the energy-momentum-tensor of the Maxwell-field is traceless? What does this imply for the Ricci-scalar? Can you show from that the condition \(q=1\) of the deceleration in the radiation epoch?

Can you show that the energy-momentum-tensor of the Maxwell-field is traceless? What does this imply for the Ricci-scalar? Can you show from that the condition \(q=1\) of the deceleration in the radiation epoch?