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Primordial perturbations in a non singular bouncing universe model

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arxiv hep-th/0203013 v1 pith:66OQMDWN submitted 2002-03-01 hep-th astro-phgr-qchep-ph

Patrick Peter (IAP) , Nelson Pinto-Neto (CBPF) This is my paper · ORCID
classification hep-thastro-phgr-qchep-ph
keywords modelbouncingfieldfindperturbationsphasepowerscalar
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We construct a simple non singular cosmological model in which the currently observed expansion phase was preceded by a contraction. This is achieved, in the framework of pure general relativity, by means of a radiation fluid and a free scalar field having negative energy. We calculate the power spectrum of the scalar perturbations that are produced in such a bouncing model and find that, under the assumption of initial vacuum state for the quantum field associated with the hydrodynamical perturbation, this leads to a spectral index n=-1. The matching conditions applying to this bouncing model are derived and shown to be different from those in the case of a sharp transition. We find that if our bounce transition can be smoothly connected to a slowly contracting phase, then the resulting power spectrum will be scale invariant.

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Cited by 5 Pith papers

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

  1. Non-singular bounce solutions in Myrzakulov $f(R,T)$ gravity

    gr-qc 2025-01 reject novelty 4.0 of 10

    In Myrzakulov F(R,T) gravity, free connection functions can be chosen to produce matter-bounce backgrounds with a scale-invariant scalar power spectrum.

  2. Bouncing Cosmological Models and Energy Conditions in $f(Q, L_m)$ gravity

    gr-qc 2026-03 unverdicted novelty 3.0 of 10

    Bouncing solutions in f(Q, L_m) gravity for symmetric, super, oscillatory and matter bounce models are supported by Hubble and scale-factor dynamics with null energy condition violation at the bounce.

  3. Bouncing Cosmology in Interacting Scalar-Torsion Gravity

    gr-qc 2025-08 conditional novelty 3.0 of 10

    Two interacting scalar-torsion models are shown, by tuned numerical construction, to host a matter bounce with phantom equation of state and NEC violation at the bounce epoch.

  4. The Quintom theory of dark energy after DESI DR2

    astro-ph.CO 2025-05 unverdicted novelty 3.0 of 10

    This review traces the history of dynamical dark energy, presents the no-go theorem against single-field crossing of w = -1, and surveys viable Quintom constructions including multi-field models and modified gravity i...

  5. 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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