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Inflation with massive spin-2 ghosts
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DOI：10.1088/1475-7516/2022/11/049.png)
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Abstract
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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.
Keywords:
inflation
quantum gravity phenomenology
modified gravity
Journal
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5.9
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