Eddington-Born-Infeld gravity and the large scale structure of the Universe
Eddington-Born-Infeld gravity and the large scale structure of the Universe
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DOI：
10.1103/physrevd.79.063511
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发表时间：
2009-03-01
影响因子：
5
通讯作者：
Skordis, C.
中科院分区：
文献类型：
--
作者：
Banados, M.;Ferreira, P. G.;Skordis, C.
有人认为，由爱丁顿-玻恩-因费尔德引力控制的宇宙可以与当前的宇宙学约束兼容。这一理论中引入的额外场可以表现为暗物质和暗能量，将暗区统一在一个连贯的框架中。我们展示了额外场在宇宙膨胀中可以发挥的各种作用，并研究了各种状态下线性扰动的演化。我们发现，作为暗区统一理论，爱丁顿-玻恩-因费尔德引力会导致宇宙微波背景在大尺度上过度波动。然而，在存在宇宙学常数的情况下，额外的场可以表现为非粒子暗物质的一种形式，并且可以导致与当前对大尺度结构的观测完全兼容的宇宙学。我们讨论对这种形式的暗物质的解释以及它与标准的颗粒暗物质的不同之处。
It has been argued that a Universe governed by Eddington-Born-Infeld gravity can be compatible with current cosmological constraints. The extra fields introduced in this theory can behave as both dark matter and dark energy, unifying the dark sector in one coherent framework. We show the various roles the extra fields can play in the expansion of the Universe and study the evolution of linear perturbations in the various regimes. We find that, as a unified theory of the dark sector, Eddington-Born-Infeld gravity will lead to excessive fluctuations in the cosmic microwave background on large scales. In the presence of a cosmological constant, however, the extra fields can behave as a form of nonparticulate dark matter and can lead to a cosmology which is entirely compatible with current observations of large scale structure. We discuss the interpretation of this form of dark matter and how it can differ from standard, particulate dark matter.