Primordial universe with the running cosmological constant

Agudelo Ruiz, Jhonny A.1,4; Netto, Tiberio de Paula3; Fabris, Julio C.1,2; Shapiro, Ilya L.4

2020-09-14

10.1140/epjc/s10052-020-8226-x

EUROPEAN PHYSICAL JOURNAL C   影响因子和分区

1434-6044

1434-6052

Theoretically, the running of the cosmological constant in the IR region is not ruled out. On the other hand, from the QFT viewpoint, the energy released due to the variation of the cosmological constant in the late Universe cannot go to the matter sector. For this reason, the phenomenological bounds on such a running are not sufficiently restrictive. The situation can be different in the early Universe when the gravitational field was sufficiently strong to provide an efficient creation of particles from the vacuum. We develop a framework for systematically exploring this possibility. It is supposed that the running occurs in the epoch when the Dark Matter already decoupled and is expanding adiabatically, while the usual matter should be regarded approximately massless and can be abundantly created from vacuum due to the decay of vacuum energy. By using the handy model of Reduced Relativistic Gas for describing the warm Dark Matter, we consider the dynamics of both cosmic background and linear perturbations and evaluate the impact of the vacuum decay on the matter power spectrum and to the first CMB peak. Additionally, using the combined SNIa+BAO data, we find the best-fit values for the free parameters of the model.

SCI

英语

NI期刊

其他

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq[303635/2018-5] ; Fundacao de Amparo a Pesquisa de Minas Gerais-FAPEMIG[APQ-01205-16]

Physics

Physics, Particles & Fields

WOS:000573095800005

SPRINGER

PHYSICS

Web of Science

1.Univ Fed Espirito Santo, Nucleo Cosmo Ufes & PPGCosmo, Dept Fis, BR-29075910 Vitoria, ES, Brazil
2.Natl Res Nucl Univ MEPhI, Kashirskoe Sh 31, Moscow 115409, Russia
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Univ Fed Juiz de Fora, Dept Fis, ICE, BR-36036100 Juiz De Fora, MG, Brazil

Agudelo Ruiz, Jhonny A.,Netto, Tiberio de Paula,Fabris, Julio C.,et al. Primordial universe with the running cosmological constant[J]. EUROPEAN PHYSICAL JOURNAL C,2020,80(9).

Agudelo Ruiz, Jhonny A.,Netto, Tiberio de Paula,Fabris, Julio C.,&Shapiro, Ilya L..(2020).Primordial universe with the running cosmological constant.EUROPEAN PHYSICAL JOURNAL C,80(9).

Agudelo Ruiz, Jhonny A.,et al."Primordial universe with the running cosmological constant".EUROPEAN PHYSICAL JOURNAL C 80.9(2020).