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Journal Article

Inflation with Massive Spin-2 Ghosts

MPS-Authors
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Kubo,  Jisuke
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Kuntz,  Jeffrey
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Rezacek,  Jonas
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Saake,  Philipp
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

External Resource

https://iopscience.iop.org/article/10.1088/1475-7516/2022/11/049/pdf
(Publisher version)

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Fulltext (public)

2207.14329.pdf
(Preprint), 822KB

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Citation

Kubo, J., Kuntz, J., Rezacek, J., & Saake, P. (2022). Inflation with Massive Spin-2 Ghosts. Journal of Cosmology and Astroparticle Physics, 2022(11): 049. doi:10.1088/1475-7516/2022/11/049.


Cite as: https://hdl.handle.net/21.11116/0000-000B-3182-A
Abstract
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
collaboration's constraints on inflation.