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Inflation in Weyl-invariant Einstein-Cartan gravity

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arxiv 2410.16364 v2 pith:MJCSQ7F5 submitted 2024-10-21 gr-qc astro-ph.COhep-th

Ioannis D. Gialamas , Kyriakos Tamvakis This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords fieldcoupledeinstein-cartangravityinflationscalarvaluesweyl-invariant
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We consider Weyl-invariant quadratic Einstein-Cartan gravity coupled to a scalar field and study the inflationary behaviour of the coupled system of the scalar field and the pseudoscalar associated with the Holst invariant. We find that the model is characterized by effective single-field inflation occurring at small field values and analyze its predictions which are in comfortable agreement with existing observations for a range of parameter values.

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Cited by 12 Pith papers

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

  1. On the Gravitational Origin of the QCD Axion

    hep-th 2025-06 accept novelty 7.0 of 10

    Derivative-coupled gravitational axions cannot solve the strong CP problem; Weyl-invariant Einstein-Cartan gravity is identified as the only promising framework for a gravitational QCD axion.

  2. Inflation with Nieh-Yan-like terms in metric-affine gravity

    gr-qc 2026-08 conditional novelty 6.0 of 10

    A generalized Nieh-Yan coupling in metric-affine gravity can restore the consistency of Palatini inflation with CMB observations and produce testable tensor-to-scalar ratios.

  3. Weyl-invariant Einstein-Cartan gravity with a heavy ALP: Higgs Inflation and $\alpha$-attractors

    hep-ph 2025-07 conditional novelty 6.0 of 10

    In a Weyl-invariant Einstein-Cartan gravity theory with the SM Higgs and a heavy gravitational ALP, tuning two nonminimal couplings reproduces metric Higgs inflation and α-attractor-like inflation with ns≈1−2/N and r≈12/N^2.

  4. The particle spectra of parity-violating theories: A less radical approach and an upgrade of PSALTer

    hep-th 2025-06 conditional novelty 6.0 of 10

    The authors derive a simpler no-ghost condition based on a kinetic matrix and release a parity-violating upgrade of PSALTer, demonstrating it on Einstein-Cartan gravity with two scalar modes.

  5. Ephemeral Oscillons in Scalar-Tensor Theories: The Higgs-like case

    hep-ph 2025-01 conditional novelty 6.0 of 10

    In a Higgs-like Einstein-Cartan inflation model, oscillons formed after inflation are short-lived and their decay drives radiation domination within about four e-folds.

  6. Torsional pseudo-inflation beyond Einstein-Cartan

    gr-qc 2026-08 conditional novelty 5.0 of 10

    Spin-fluid torsion cannot sustain inflation beyond about 0.46 e-folds, but a coupling-fed axial torsion condensate can hold an exact de Sitter background with an algebraic exit.

  7. Atomic clocks and gravitational waves as probes of non-metricity

    gr-qc 2026-01 reject novelty 5.0 of 10

    The paper claims existing gravitational-wave data already bound Weyl non-metricity, α²ω̄0<10⁻⁶⁹ GeV, via backreaction of a Planck-scale Weyl field, but a dropped kinetic term numerically exceeds the assumed sensitivity.

  8. Inflationary assessment of $F(\mathcal{R},\tilde{\mathcal{R}})$ Einstein-Cartan models

    gr-qc 2025-12 conditional novelty 5.0 of 10

    Adding cubic Holst-invariant terms to F(R,R̃) Einstein-Cartan inflation models systematically lowers the predicted spectral index n_s and tensor-to-scalar ratio r, restoring data compatibility in parameter regions whe...

  9. Symmetry-breaking inflation in non-minimal metric-affine gravity

    gr-qc 2024-12 conditional novelty 5.0 of 10

    A Holst-invariant coupling to the inflaton makes symmetry-breaking inflation viable, including the previously unattainable sub-Planckian vacuum expectation value case.

  10. Modified gravity from Weyl connection and the $f(R,\cal{A})$ extension

    gr-qc 2024-11 reject novelty 5.0 of 10

    Weyl-connection gravity with a dynamical vector field produces an effective dark energy sector, recovering Lambda-CDM in one class and dynamical dark energy in others.

  11. $\tilde\xi$-attractors in metric-affine gravity

    gr-qc 2024-11 conditional novelty 5.0 of 10

    A new class of metric-affine inflationary models, the ξ-tilde-attractors, reproduces Starobinsky inflation as a universal attractor in two strong-coupling limits.

  12. Geometrical origin of inflation in Weyl-invariant Einstein-Cartan gravity

    gr-qc 2025-01 conditional novelty 4.0 of 10

    The scalar mode of Weyl-invariant Einstein-Cartan quadratic gravity yields the same inflationary potential as pseudoscalaron inflation and can fit CMB data for large parameter q.

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