Dilaton and modified gravity

被引：177

作者：

Brax, Philippe ^{[1
]}

van de Bruck, Carsten ^{[2
]}

Davis, Anne-Christine ^{[3
]}

Shaw, Douglas ^{[4
]}

机构：

[1] CEA, Inst Phys Theor, IPhT, CNRS,URA 2306, F-91191 Gif Sur Yvette, France

[2] Univ Sheffield, Dept Appl Math, Sheffield S3 7RH, S Yorkshire, England

[3] Ctr Math Sci, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England

[4] Queen Mary Univ London, Astron Unit, London E1 4NS, England

来源：

PHYSICAL REVIEW D | 2010年 / 82卷 / 06期

关键词：

D O I：

10.1103/PhysRevD.82.063519

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the dilaton in the strong string-coupling limit and elaborate on the original idea of Damour and Polyakov whereby the dilaton coupling to matter is minimized and vanishes at a finite value of the dilaton field. Combining this type of coupling with an exponential potential, the effective potential of the dilaton becomes matter density dependent. We study the background cosmology, showing that the dilaton can play the role of dark energy. We also analyze the constraints imposed by the absence of violation of the equivalence principle. Imposing these constraints and assuming that the dilaton plays the role of dark energy, we consider the consequences of the dilaton on large scale structures and, in particular, the behavior of the slip functions and the growth index at low redshift.

引用

页数：14

共 33 条

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