2004/01/19 by M. Sharif
Physics and Astronomy · #gr-qc
published as Chin.J.Phys. 40 (2002) 590-593
arxiv created 2004/01/19 · arxiv updated 2009/12/01
We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dominated Friedmann model. It turns out that the results are physically acceptable.