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A UNIFIED DARK ENERGY MODEL FROM A VANISHING SPEED OF SOUND WITH EMERGENT COSMOLOGICAL CONSTANT

ORLANDO LUONGO

Dipartimento di Scienze Fisiche, Università di Napoli "Federico II", Via Cinthia, I-80126, Napoli, Italy

Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70543, México DF 04510, Mexico

INFN Sezione di Napoli, Complesso Universitario di Monte S. Angelo Edificio, N Via Cinthia, I-80126, Napoli, Italy

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and

HERNANDO QUEVEDO

Dipartimento di Fisica and Icra, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, I-00185, Roma, Italy

Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70543, México DF 04510, Mexico

Instituto de Cosmologia, Relatividade e Astrofisica Icra-CBPF Rua, Dr. Xavier Sigaud, 150, CEP 22290-180, Rio de Janeiro, Brazil

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https://doi.org/10.1142/S0218271814500126Cited by:55 (Source: Crossref)

Abstract

The problem of the cosmic acceleration is here revisited by using the fact that the adiabatic speed of sound can be assumed to be negligible small. Within the context of general relativity, the total energy budget is recovered under the hypothesis of a vanishing speed of sound by assuming the existence of one fluid only. We find a cosmological model which reproduces the main results of the ΛCDM paradigm at late-times, showing an emergent cosmological constant, which is not at all related with the vacuum energy term. As a consequence, the model presented here behaves as a unified dark energy (DE) model.

Keywords:

PACS: 98.80.-k, 98.80.Jk, 98.80.Es

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