Production of primordial gravitational waves in a simple class of running vacuum cosmologies

Production of primordial gravitational waves in a simple class of running vacuum cosmologies

Author Tamayo, D. A. Google Scholar
Lima, J. A. S. Google Scholar
Bessada, D. F. A. Autor UNIFESP Google Scholar
Abstract The problem of cosmological production of gravitational waves (GWs) is discussed in the framework of an expanding, spatially homogeneous and isotropic FRW type universe with time-evolving vacuum energy density. The GW equation is established and its modified time-dependent part is analytically resolved for different epochs in the case of a flat geometry. Unlike the standard Lambda CDM cosmology (no interacting vacuum), we show that GWs are produced in the radiation era even in the context of general relativity. We also show that for all values of the free parameter, the high frequency modes are damped out even faster than in the standard cosmology both in the radiation and matter-vacuum dominated epoch. The formation of the stochastic background of gravitons and the remnant power spectrum generated at different cosmological eras are also explicitly evaluated. It is argued that measurements of the CMB polarization (B-modes) and its comparison with the rigid Lambda CDM model plus the inflationary paradigm may become a crucial test for dynamical dark energy models in the near future.
Keywords Cosmology
decaying vacuum
gravitational waves
Language English
Date 2017
Published in International Journal Of Modern Physics D. Singapore, v. 26, n. 9, p. -, 2017.
ISSN 0218-2718 (Sherpa/Romeo, impact factor)
Publisher World Scientific Publ Co Pte Ltd
Extent -
Access rights Closed access
Type Article
Web of Science ID WOS:000405693100008

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