Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction

Autor:	Amendola, L., Gasperini, M., Ungarelli, C.
Rok vydání:	2007
Předmět:	General Relativity and Quantum Cosmology Astrophysics High Energy Physics - Theory
Zdroj:	Phys.Rev.D77:123526,2008
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.77.123526
Popis:	A model of non-local dilaton interactions, motivated by string duality symmetries, is applied to a scenario of "coupled quintessence" in which the dilaton dark energy is non-locally coupled to the dark-matter sources. It is shown that the non-local effects tend to generate a backreaction which -- for strong enough coupling -- can automatically compensate the acceleration due to the negative pressure of the dilaton potential, thus asymptotically restoring the standard (dust-dominated) decelerated regime. This result is illustrated by analytical computations and numerical examples. Comment: 11 pages, 1 figure eps
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0711.5022 Zobrazit plný text záznamu View this record from Arxiv