Dilaton and modified gravity
Dilaton and modified gravity
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DOI：
10.1103/physrevd.82.063519
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发表时间：
2010-09-15
影响因子：
5
通讯作者：
Shaw, Douglas
中科院分区：
文献类型：
--
作者：
Brax, Philippe;van de Bruck, Carsten;Shaw, Douglas
我们认为，在强弦耦合限制和Damour和Polyakov的原始想法，从而使耦合到物质的介子最小化，消失在一个有限值的介子场的介子。将这种类型的耦合与指数势相结合，电子子的有效势变得依赖于物质密度。我们研究了背景宇宙学，证明了光子可以扮演暗能量的角色。我们还分析了所施加的限制的情况下违反等效原则。施加这些限制，并假设的介子发挥暗能量的作用，我们考虑的后果的介子上的大尺度结构，特别是在低红移的滑移函数和增长指数的行为。
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.