Anisotropy in a non-singular bounce - Archive ouverte HAL
Article Dans Une Revue Classical and Quantum Gravity Année : 2013

Anisotropy in a non-singular bounce

Yi-Fu Cai
  • Fonction : Auteur
Robert Brandenberger
  • Fonction : Auteur

Résumé

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.

Communicated by P Singh

Dates et versions

hal-03645579 , version 1 (19-04-2022)

Identifiants

Citer

Yi-Fu Cai, Robert Brandenberger, Patrick Peter. Anisotropy in a non-singular bounce. Classical and Quantum Gravity, 2013, 30, ⟨10.1088/0264-9381/30/7/075019⟩. ⟨hal-03645579⟩
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