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A Cosmological Super-Bounce

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arxiv 1310.7577 v3 pith:YL5WQP62 submitted 2013-10-28 hep-th gr-qc

Michael Koehn , Jean-Luc Lehners , Burt A. Ovrut This is my paper · ORCID
classification hep-thgr-qc
keywords bouncemodelsupergravityconditionscosmologicalghostnon-singularphase
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We study a model for a non-singular cosmic bounce in N=1 supergravity, based on supergravity versions of the ghost condensate and cubic Galileon scalar field theories. The bounce is preceded by an ekpyrotic contracting phase which prevents the growth of anisotropies in the approach to the bounce, and allows for the generation of scale-invariant density perturbations that carry over into the expanding phase of the universe. We present the conditions required for the bounce to be free of ghost excitations, as well as the tunings that are necessary in order for the model to be in agreement with cosmological observations. All of these conditions can be met. Our model thus provides a proof-of-principle that non-singular bounces are viable in supergravity, despite the fact that during the bounce the null energy condition is violated.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Strong coupling and instabilities in singularity-free inflation from an infinite sum of curvature corrections

    gr-qc 2025-05 conditional novelty 6.0 of 10

    The infinite-sum Lovelock inflation solution is ruled out by strong scalar coupling and tensor Laplacian instabilities.

  2. Non-Gaussianity and Strong-Coupling Problem in a Two-Field DHOST Bouncing Model

    hep-th 2026-06 unverdicted novelty 4.0 of 10

    Refines two-field DHOST bouncing model to match observed f_NL and keep strong-coupling scale above background energy, claiming full viability at linear and non-linear levels.

  3. Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution

    gr-qc 2017-05 accept novelty 2.0 of 10

    Modified gravity theories supply viable mathematical frameworks for inflation, bounces, and dark energy eras that match observational data.

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