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Classically Stable Nonsingular Cosmological Bounces

Author(s): Ijjas, Anna; Steinhardt, Paul J.

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Abstract: One of the fundamental questions of theoretical cosmology is whether the Universe can undergo a nonsingular bounce, i.e., smoothly transit from a period of contraction to a period of expansion through violation of the null energy condition (NEC) at energies well below the Planck scale and at finite values of the scale factor such that the entire evolution remains classical. A common claim has been that a nonsingular bounce either leads to ghost or gradient instabilities or a cosmological singularity. In this Letter, we consider a well-motivated class of theories based on the cubic Galileon action and present a procedure for explicitly constructing examples of a nonsingular cosmological bounce without encountering any pathologies and maintaining a subluminal sound speed for comoving curvature modes throughout the NEC violating phase. We also discuss the relation between our procedure and earlier work.
Publication Date: 16-Sep-2016
Electronic Publication Date: 16-Sep-2016
Citation: Ijjas, Anna, Steinhardt, Paul J. (2016). Classically Stable Nonsingular Cosmological Bounces. PHYSICAL REVIEW LETTERS, 117, doi:10.1103/PhysRevLett.117.121304
DOI: doi:10.1103/PhysRevLett.117.121304
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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