Cosmology from a running vacuum model driven by a scalar field

Author(s)

Santos, J. R. L. ^[1] ; Moraes, P. H. R. S. ^{[2, 3]}

Affiliation

^[1] Univ Fed Campina Grande, Unidade Acad Fis, BR-58429900 Campina Grande, PB - Brazil

^[2] ITA, Dept Fis, BR-2228900 Sao Jose Dos Campos, SP - Brazil

^[3] Univ Napoli Federico II UNINA, Dept Phys, I-80126 Naples - Italy

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS; v. 17, n. 1 JAN 2020.
• Web of Science Citations: 0

Abstract

The possibility that the vacuum energy density rho(Lambda) is, indeed, varying in time, has been investigated lately from the running vacuum models perspective. Motivated by such models, in this work, we relate the decaying vacuum energy rho(Lambda) (t) with a scalar field (phi). We derive the equations of motion from such a premise and implement the first-order formalism in order to obtain analytical solutions to the cosmological parameters. We show that these are in agreement with recent Planck observational data. We discuss the physical consequences of having rho(Lambda) (t) related to phi. (AU)

• FAPESP's process: 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources
• Grantee: Pedro Henrique Ribeiro da Silva Moraes
• Support type: Scholarships in Brazil - Post-Doctorate