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Starobinsky inflation beyond the leading order

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arxiv 2407.21349 v3 pith:UELJRT4H submitted 2024-07-31 gr-qc hep-th

Shunsuke Toyama , Sergei V. Ketov This is my paper · ORCID
classification gr-qchep-th
keywords starobinskycorrectionsinflationquantumcurvatureeffectivefoundmodel
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The Starobinsky model of cosmological inflation in four spacetime dimensions is reviewed with the emphasis on impact of quantum gravity corrections. As a specific example of the quantum corrections, the Grisaru-Zanon quartic curvature terms in the gravitational effective action of closed superstrings are chosen. Those quartic curvature terms are compared to the Bel-Robinson tensor squared in a flat Friedman universe, and the upper bound on the effective string coupling constant is found by demanding unitarity (causality) and the absence of ghosts. It is found that the quantum corrections to the observables (tilts) of the cosmic microwave background radiation in the Starobinsky inflation may be of the same order of magnitude as the next-to-next-to-next classical contributions in the Starobinsky model with respect to the inverse powers of the e-folding number at the horizon crossing.

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Cited by 4 Pith papers

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

  1. Higgs boson mass and thermal wino dark matter from Starobinsky supergravity with the MSSM

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Starobinsky supergravity coupled to the MSSM links the CMB inflationary scale to the Higgs boson mass (~125 GeV) and predicts thermal wino dark matter at ~3 TeV, testable at future colliders and direct detection experiments.

  2. The effective phase space and $e$-folding of the Starobinsky and extended Starobinsky model of inflation

    gr-qc 2025-01 conditional novelty 6.0 of 10

    Under the Remmen-Carroll measure, the expected total e-folds for Starobinsky inflation are only about 3.5 to 4 for observationally allowed field values.

  3. 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...

  4. The Preheating Stage on The Starobinsky Inflation after ACT

    gr-qc 2025-07 reject novelty 4.0 of 10

    Starobinsky inflation needs an extra spectator scalar to preheat efficiently, and the paper fits its mass, coupling, and momentum to reach a reheating temperature near 10^14 GeV after ACT.

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