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The Cosmology of Generalized Modified Gravity Models

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arxiv astro-ph/0410031 v2 pith:IDR2XQOX submitted 2004-10-01 astro-ph hep-phhep-th

Sean M. Carroll , Antonio De Felice , Vikram Duvvuri , Damien A. Easson , Mark Trodden , Michael S. Turner This is my paper · ORCID
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We consider general curvature-invariant modifications of the Einstein-Hilbert action that become important only in regions of extremely low space-time curvature. We investigate the far future evolution of the universe in such models, examining the possibilities for cosmic acceleration and other ultimate destinies. The models generically possess de Sitter space as an unstable solution and exhibit an interesting set of attractor solutions which, in some cases, provide alternatives to dark energy models.

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Cited by 7 Pith papers

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

  1. Unstable de Sitter inflationary solution in sixth-order gravity

    gr-qc 2026-07 conditional novelty 6.0 of 10

    For the sixth-order gravity action (2.1), the exact FLRW de Sitter solution is unstable whenever 3γ1+γ2<0, while the second-order limit admits a stable de Sitter attractor.

  2. The Regular Ricci-Inverse Cosmology with Multiple Anticurvature Scalars

    gr-qc 2025-01 conditional novelty 6.0 of 10

    A combination of Ricci and inverse-Ricci scalars is constructed that gives regular FLRW background equations, reducing the linear model to general relativity with a shifted Hubble constant.

  3. Big-Bang Nucleosynthesis and WIMP Dark Matter Freeze-Out as Probes of Yukawa Cosmology

    astro-ph.CO 2026-08 reject novelty 5.0 of 10

    Using BBN and WIMP relic density, the authors constrain the Yukawa gravity coupling α to about -0.017 to 0.018, with the lithium discrepancy still unexplained.

  4. Dynamical system analysis of the cosmological phases in Palatini $k$-essence gravity

    gr-qc 2025-11 unverdicted novelty 5.0 of 10

    Dynamical systems analysis of a Palatini k-essence model identifies fixed points for quasi-de-Sitter epochs, scaling solutions, and quintessence phases connected by heteroclinic orbits in flat FLRW cosmology.

  5. From minimal-length quantum theory to modified gravity

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    A systematic mapping is derived from GUP parameters in minimal-length quantum theory to higher-order curvature coefficients in extended gravity, with an application yielding an upper bound on the minimal measurable le...

  6. Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    Two phenomenological dark matter creation rates can reproduce the accelerated expansion of the universe and fit current background data as well as or slightly better than LambdaCDM for some DESI-based data combinations.

  7. Information--Theoretic Black Hole Entropy II: Infrared Gravity and Charged/Rotating Extensions

    hep-th 2026-08 conditional novelty 4.0 of 10

    A perturbative infrared deformation of general relativity, with coefficients fixed by matching, reproduces the proposed third-law-compatible black hole entropy, and the same formula extends to Kerr-Newman black holes ...

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