2019/12/10 by Jaime Mendoza Hernández, Hernández, Jaime Mendoza, Mauricio Bellini +3
Physics and Astronomy · #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #gr-qc
paper · pdf · doi:10.48550/arxiv.1912.04790
11 pages, 4 figures
arxiv created 2019/12/10 · arxiv updated 2019/12/11
We study the emission of space-time waves produced by back-reaction effects during a collapse of a spherically symmetric universe with a time dependent cosmological parameter, which is driven by a scalar field. As in a previous work the final state avoids the final singularity due to the fact the co-moving relativistic observer never reaches the center, because the physical time evolution dτ=U0 dx0, decelerates for a co-moving observer which falls with the collapse. The equation of state of the system depends on the rate of the collapse, but always is positive: 0 < ω(p) < 0.25.