Relic gravitational waves in the expanding Universe

Details Relic gravitational waves in the expanding Universe Relic gravitational waves in the expanding Universe

2006-01-12

arxiv.org/abs/gr-qc/0601050v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

98 pages, 14 figures, PhD thesis (Autonomus University of Barcelona)

Scientific paper

In this thesis, we have reviewed how the expansion of the Universe amplifies the quantum vacuum fluctuations, and how the relic GWs spectrum is related with the scale factor. We have evaluated the spectrum in different scenarios: a model of expanding universe with an era dominated by mini black holes and radiation right after the inflation and a model with an era of accelerated expansion right after the radiation era. Next, we have applied the generalized second law of thermodynamics to the latter model. Finally, we have extended the GSL study to a single stage universe model dominated by dark energy (either phantom or not).

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