We consider the radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare our results with those obtained previously by using the matter-dominated Friedmann model.
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Wang, T. C. (2011). Perturbations in the f(R) Cosmology [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2011.00884