Cosmological consequences of exponential gravity in Palatini formalism

被引：14

作者：

Campista, M. ^{[1
]}

Santos, B. ^{[1
]}

Santos, J. ^{[2
]}

Alcaniz, J. S. ^{[1
]}

机构：

[1] Observ Nacl, BR-20921400 Rio De Janeiro, Brazil

[2] Univ Fed Rio G Norte, Dept Fis, BR-59072970 Natal, RN, Brazil

来源：

PHYSICS LETTERS B | 2011年 / 699卷 / 05期

关键词：

Cosmology; Modified gravity; Cosmological parameters; F(R) GRAVITY; ENERGY CONDITIONS; CONSTRAINTS; VIABILITY; GALAXY; FORMULATION; SUPERNOVAE; MODELS; JORDAN;

D O I：

10.1016/j.physletb.2011.04.032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate cosmological consequences of a class of exponential f (R) gravity in the Palatini formalism. By using the current largest type la Supernova sample along with determinations of the cosmic expansion at intermediary and high-z we impose tight constraints on the model parameters. Differently from other f (R) models, we find solutions of transient acceleration, in which the large-scale modification of gravity will drive the Universe to a new decelerated era in the future. We also show that a viable cosmological history with the usual matter-dominated era followed by an accelerating phase is predicted for some intervals of model parameters. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：320 / 324

页数：5

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