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Classically Stable Nonsingular Cosmological Bounces

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

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dc.contributor.authorIjjas, Anna-
dc.contributor.authorSteinhardt, Paul J.-
dc.identifier.citationIjjas, Anna, Steinhardt, Paul J. (2016). Classically Stable Nonsingular Cosmological Bounces. PHYSICAL REVIEW LETTERS, 117, doi:10.1103/PhysRevLett.117.121304en_US
dc.description.abstractOne 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.en_US
dc.relation.ispartofPHYSICAL REVIEW LETTERSen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleClassically Stable Nonsingular Cosmological Bouncesen_US
dc.typeJournal Articleen_US

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