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Nearly scale-invariant curvature modes from entropy perturbations during graceful exit

MPG-Autoren
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Ijjas,  Anna
Lise Meitner Excellence Group: Gravitational Theory and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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2102.03818.pdf
(Preprint), 459KB

PhysRevD.103.L101302.pdf
(Verlagsversion), 313KB

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Zitation

Ijjas, A., & Kolevatov, R. (2021). Nearly scale-invariant curvature modes from entropy perturbations during graceful exit. Physical Review D, 103(10): L101302. doi:10.1103/PhysRevD.103.L101302.


Zitierlink: https://hdl.handle.net/21.11116/0000-0008-16FC-4
Zusammenfassung
In this Letter, we describe how a spectrum of entropic perturbations
generated during a period of slow contraction can source a nearly
scale-invariant spectrum of curvature perturbations on length scales larger
than the Hubble radius during the transition from slow contraction to a
classical non-singular bounce (the `graceful exit' phase). The sourcing occurs
naturally through higher-order scalar field kinetic terms common to classical
(non-singular) bounce mechanisms. We present a concrete example in which, by
the end of the graceful exit phase, the initial entropic fluctuations have
become negligible and the curvature fluctuations have a nearly scale-invariant
spectrum with an amplitude consistent with observations.