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Inflation with Massive Spin-2 Ghosts

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arxiv 2207.14329 v2 pith:M63KYZAD submitted 2022-07-28 astro-ph.CO gr-qchep-phhep-th

Jisuke Kubo , Jeffrey Kuntz , Jonas Rezacek , Philipp Saake This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords inflationaryfindinflationmassiveparametersscalarspin-2additional
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We consider a generic model of quadratic gravity coupled to a single scalar and investigate the effects of gravitational degrees of freedom on inflationary parameters. We find that quantum corrections arising from the massive spin-2 ghost generate significant contributions to the effective inflationary potential and allow for a realization of the spontaneous breakdown of global scale invariance without the need for additional scalar fields. We compute inflationary parameters, compare the resulting predictions to well-known inflationary models, and find that they fit well within the Planck and BICEP/Keck collaboration's constraints on inflation.

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  1. Primordial Gravitational Waves in Quadratic Gravity

    gr-qc 2025-02 unverdicted novelty 6.0 of 10

    In quadratic gravity, the inflationary tensor power spectrum is suppressed by (1 + 2H_*^2/m_gh^2)^{-1}, which restores the standard consistency relation r = -8n_t.

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