期刊
CLASSICAL AND QUANTUM GRAVITY
卷 30, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/30/7/075019
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资金
- NSERC Discovery Grant
- Canada Research Chair program
- CNRS
- PICS [05893]
Following recent claims relative to the question of large anisotropy production in regular bouncing scenarios, we study the evolution of such anisotropies in a model where an ekpyrotic phase of contraction is followed by domination of a Galileon-type Lagrangian which generates a non-singular bounce. We show that the anisotropies decrease during the phase of ekpyrotic contraction (as expected) and that they can be constrained to remain small during the non-singular bounce phase (a non-trivial result). Specifically, we derive the e-folding number of the phase of ekpyrotic contraction which leads to a present-day anisotropy in agreement with current observational bounds.
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