Eddington-Born-Infeld引力与宇宙的大尺度结构
Eddington-Born-Infeld gravity and the large scale structure of the Universe
摘要：
有人认为，由爱丁顿-玻恩-因菲尔德引力支配的宇宙可以与当前的宇宙学约束相容。这个理论中引入的额外场可以同时表现为暗物质和暗能量，将暗区统一在一个连贯的框架中。我们展示了额外的领域可以在宇宙的膨胀中发挥的各种作用，并研究了各种制度中的线性扰动的演变。我们发现，作为暗区的统一理论，Eddington-Born-Infeld引力在大尺度上会导致宇宙微波背景的过度起伏。然而，在宇宙学常数存在的情况下，额外的场可以表现为非粒子暗物质的形式，并可以导致与当前大尺度结构的观测完全兼容的宇宙学。我们讨论这种形式的暗物质的解释，以及它如何可以不同于标准的，颗粒状的暗物质。
英文摘要：
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 both as 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 non-particulate 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.
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