@Article{TamayoLimaAlveAraú:2017:PrGrWa,
author = "Tamayo, D. A. and Lima, J. A. S. and Alves, M{\'a}rcio E. S. and
Ara{\'u}jo, Jos{\'e} Carlos Neves de",
affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)} and {Universidade Estadual Paulista (UNESP)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Primordial gravitational waves in running vacuum cosmologies",
journal = "Astroparticle Physics",
year = "2017",
volume = "87",
pages = "18--22",
keywords = "Cosmology, Gravitational waves, Relativity and gravitation, Wave
generation and sources.",
abstract = "We investigate the cosmological production of gravitational waves
in a nonsingular flat cosmology powered by a running vacuum energy
density described by \ρ\Λ \≡
\ρ\Λ(H), a phenomenological expression potentially
linked with the renormalization group approach in quantum field
theory in curved spacetimes. The model can be interpreted as a
particular case of the class recently discussed by Perico et al.
(2013) [25] which is termed complete in the sense that the cosmic
evolution occurs between two extreme de Sitter stages (early and
late time de Sitter phases). The gravitational wave equation is
derived and its time-dependent part numerically integrated since
the primordial de Sitter stage. The generated spectrum of
gravitons is also compared with the standard calculations where an
abrupt transition, from the early de Sitter to the radiation
phase, is usually assumed. It is found that the stochastic
background of gravitons is very similar to the one predicted by
the cosmic concordance model plus inflation except at higher
frequencies (\ν \≳ 100 kHz). This remarkable
signature of a running vacuum cosmology combined with the proposed
high frequency gravitational wave detectors and measurements of
the CMB polarization (B-modes) may provide a new window to
confront more conventional models of inflation.",
doi = "10.1016/j.astropartphys.2016.11.007",
url = "http://dx.doi.org/10.1016/j.astropartphys.2016.11.007",
issn = "0927-6505",
language = "en",
targetfile = "tamayo_primordial.pdf",
urlaccessdate = "27 abr. 2024"
}