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arxiv: 0802.1634 · v1 · submitted 2008-02-12 · 🌌 astro-ph · gr-qc· hep-ph· hep-th

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Bouncing Cosmologies

M. Novello , S.E.Perez Bergliaffa
Authors on Pith no claims yet
classification 🌌 astro-ph gr-qchep-phhep-th
keywords cosmologiesmechanismsuniversesacceleratedanalyzebehaviorbehindbounce
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We review the general features of nonsingular universes ({\em i.e.} those that go from an era of accelerated collapse to an expanding era without displaying a singularity) as well as cyclic universes. We discuss the mechanisms behind the bounce, and analyze examples of solutions that implement these mechanisms. Observational consequences of such regular cosmologies are also considered, with emphasis in the behavior of the perturbations.

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Cited by 5 Pith papers

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

  1. Phase-resolved field-space distance bounds in ekpyrotic, bouncing and cyclic cosmologies

    gr-qc 2026-05 unverdicted novelty 7.0

    Phase-resolved field-space distance bounds for non-inflationary smoothing yield a master lower bound on ε_ek and imply ultra-fast-roll ekpyrosis or modified bounces to match observed red-tilted perturbations.

  2. Phase-resolved field-space distance bounds in ekpyrotic, bouncing and cyclic cosmologies

    gr-qc 2026-05 unverdicted novelty 7.0

    Phase-resolved scalar distance bounds are derived for ekpyrotic, bouncing, and cyclic cosmologies, yielding a master condition that lower-bounds ε_ek from remaining distance after conversion and bounce.

  3. Geodesically Complete Curvature-Bounce Inflation

    astro-ph.CO 2026-04 unverdicted novelty 5.0

    A closed k=+1 FRW universe with curvature-driven bounce and canonical scalar inflation remains sub-Planckian, satisfies the null energy condition, and produces ns=0.9617-0.9650 and r=0.0037-0.0045 consistent with data.

  4. Energy conditions of bouncing solutions in quadratic curvature gravity coupled with a scalar field

    gr-qc 2026-03 unverdicted novelty 4.0

    Bouncing solutions in quadratic curvature gravity with a scalar field satisfy null, weak, and dominant energy conditions but violate the strong one when using the scalar-field energy-momentum tensor, while all four co...

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

    gr-qc 2017-05 accept novelty 2.0

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