Matter bispectrum in cubic Galileon cosmologies

被引：40

作者：

Bartolo, Nicola ^{[1
,2
]}

Bellini, Emilio ^{[1
,2
]}

Bertacca, Daniele ^{[3
]}

Matarrese, Sabino ^{[1
,2
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[3] Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2013年 / 03期

关键词：

modified gravity; power spectrum; dark energy theory; UNIVERSE;

D O I：

10.1088/1475-7516/2013/03/034

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we obtain the bispectrum of dark matter density perturbations in the frame of covariant cubic Galileon theories. This result is obtained by means of a semi-analytic approach to second-order perturbations in Galileon cosmologies, assuming Gaussian initial conditions. In particular, we show that, even in the presence of large deviations of the linear growth-rate w.r.t. the Lambda CDM one, at the bispectrum level such deviations are reduced to a few percent.

引用

页数：39

共 78 条

[1] Modified gravity a la Galileon: Late time cosmic acceleration and observational constraints [J].