Comment on “Gauss-Bonnet inflation”

Recently, an interesting inflationary scenario, named Gauss-Bonnet inflation, was proposed by Kanti et al.[Phys. Rev. D 92, 041302 (2015); Phys. Rev. D 92, 083524 (2015)]. In the model, there is no inflaton potential, but the inflaton couples to the Guass-Bonnet term. In the case of quadratic coupli...

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Bibliographic Details
Published in:Physical review. D 2016-03, Vol.93 (6), Article 068301
Main Authors: Hikmawan, Getbogi, Soda, Jiro, Suroso, Agus, Zen, Freddy P.
Format: Article
Language:English
Subjects:
Cosmology
Couples
Coupling
Gravitation
Inflation
Instability
Mathematical analysis
Perturbation methods
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Summary:Recently, an interesting inflationary scenario, named Gauss-Bonnet inflation, was proposed by Kanti et al.[Phys. Rev. D 92, 041302 (2015); Phys. Rev. D 92, 083524 (2015)]. In the model, there is no inflaton potential, but the inflaton couples to the Guass-Bonnet term. In the case of quadratic coupling, they find inflation occurs with a graceful exit. The scenario is attractive because of the natural setup. However, we show there exists a gradient instability in the tensor perturbations in this inflationary model. We further prove the no-go theorem for Gauss-Bonnet inflation without an inflaton potential.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.068301