Palatini NMDC gravity: cosmological scalar field phase portraits in exponential potential

Autor:	Muhammad, Candrasyah, Saichaemchan, Somphoach, Gumjudpai, Burin
Rok vydání:	2018
Předmět:	General Relativity and Quantum Cosmology High Energy Physics - Theory
Zdroj:	Journal of Physics: Conference Series (2018) 1144:012128
Druh dokumentu:	Working Paper
Popis:	We consider cosmological scalar field evolving under exponential potential of the Non-minimal Derivative Coupling (NMDC) gravity model in Palatini formalism. Slow-roll regime is assumed. GR and metric formalism NMDC cases are compared in this study. Phase portraits show that Palatini NMDC effect restricts acceleration phase into smaller region in the phase space. NMDC effect of the Palatini case suppresses expansion rate than that of the GR while the metric NMDC enhances rate of expansion of the GR case. Comment: 4 pages, 2 figures, SPC 2018 Conference Paper, to appear in Jour. of Phys. Conf. Series
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1808.10686 Zobrazit plný text záznamu View this record from Arxiv