Late-times asymptotic equation of state for a class of nonlocal theories of gravity

被引：1

作者：

Giani, Leonardo ^{[1
,2
,3
]}

Piattella, Oliver F. ^{[1
,2
,3
]}

机构：

[1] Univ Fed Espirito Santo, Dept Phys, Ave Fernando Ferrari 514, BR-29075910 Vitoria, ES, Brazil

[2] Univ Fed Espirito Santo, Nucleo Cosmoufes & PPGCosmo, Ave Fernando Ferrari 514, BR-29075910 Vitoria, ES, Brazil

[3] Heidelberg Univ, Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany

来源：

PHYSICAL REVIEW D | 2019年 / 100卷 / 12期

关键词：

COSMOLOGICAL CONSTANT; DARK-MATTER; ENERGY;

D O I：

10.1103/PhysRevD.100.123508

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the behavior of the asymptotic late-times effective equation of state for a class of nonlocal theories of gravity. These theories modify the Einstein-Hilbert Lagrangian introducing terms containing negative powers of the d'Alembert operator acting on the Ricci scalar. We find that imposing vanishing initial conditions for the nonlocal content during the radiation-dominated epoch implies the same asymptotic late-times behavior for most of these models. In terms of the effective equation of state of the Universe, we find that asymptotically omega(eff) -> -1, approaching the value given by a cosmological constant. On the other hand, unlike in the case of Lambda CDM, the Hubble factor is a monotonic growing function that diverges asymptotically. We argue that this behavior is not a coincidence and discuss under which conditions this is to be expected in these nonlocal models.

引用

页数：10