No-Go Theorem for Gauss-Bonnet Inflation without Inflaton Potential

Autor:	Hikmawan, Getbogi, Soda, Jiro, Suroso, Agus, Zen, Freddy P.
Rok vydání:	2015
Předmět:	High Energy Physics - Theory Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
Zdroj:	Phys. Rev. D 93, 068301 (2016)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.93.068301
Popis:	Recently, an interesting inflationary scenario, named Gauss-Bonnet inflation, is proposed by Kanti et al.~\cite{Kanti:2015pda,Kanti:2015dra}. 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 graceful exit. The scenario is attractive because of the natural set-up. However, we show there exists the gradient instability in the tensor perturbations in this inflationary model. We further prove the no-go theorem for the Gauss-Bonnet inflation without an inflaton potential. Comment: 6 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1512.00222 Zobrazit plný text záznamu View this record from Arxiv