Cosmological dynamics and double screening of DBI-Galileon gravity

Sirachak Panpanich, Supakchai Ponglertsakul, Kei Ichi Maeda

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate cosmological dynamics and screening mechanism of the Dirac-Born-Infeld (DBI) Galileon model. The model has been divided into two regimes, one has positive signs in front of scalar field kinetic terms so-called the DBI Galileon, another one has negative signs and it is dubbed as the DBIonic Galileon. We find de Sitter solution and evolution of the Universe starting from radiation dominated era to late-time accelerated expansion in the DBI Galileon model without the presence of potential term. In one of the attractors, the ghost and Laplacian instabilities vanishes for the whole evolution. We find mixing of screening mechanisms between the Vainshtein mechanism and the DBIonic screening mechanism in the DBIonic Galileon model, in which a scale changing between these two mechanisms depends on a mass of a source.

Original languageEnglish
Article number044038
JournalPhysical Review D
Volume100
Issue number4
DOIs
Publication statusPublished - 2019 Aug 20

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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