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Cosmological perfect-fluids in f(R) gravity

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arxiv 1810.03204 v2 pith:NNOBHIKW submitted 2018-10-07 gr-qc astro-ph.COhep-th

Cosmological perfect-fluids in f(R) gravity

Salvatore Capozziello , Carlo Alberto Mantica , Luca Guido Molinari This is my paper
classification gr-qc astro-ph.COhep-th
keywords gravitycurvaturefluidperfectspace-timetensorconformalconformally
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show that an n-dimensional generalized Robertson-Walker (GRW) space-time with divergence-free conformal curvature tensor exhibits a perfect fluid stress-energy tensor for any f(R) gravity model. Furthermore we prove that a conformally flat GRW space-time is still a perfect fluid in both f(R) and quadratic gravity where other curvature invariants are considered.

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Cited by 2 Pith papers

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

  1. ACT Data and Positive Running of the Spectral Index for Scalar Theory and Modified Gravity

    gr-qc 2026-05 unverdicted novelty 5.0

    Positive running of the spectral index is achievable in Einstein-Gauss-Bonnet gravity with viable inflation, unlike standard scalar field and F(R) models which face challenges.

  2. ACT Data and Positive Running of the Spectral Index for Scalar Theory and Modified Gravity

    gr-qc 2026-05 unverdicted novelty 4.0

    Einstein-Gauss-Bonnet inflation can yield positive spectral-index running with a viable era under ACT-like hints, while scalar-field and F(R) models largely cannot.