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2018

Gauss-Bonnet inflation and swampland

Yi, Zhu, Gong, Yungui

Understand

The two swampland criteria are generically in tension with the single field slow-roll inflation because the first swampland criterion requires small tensor to scalar ratio while the second swampland criterion requires large tensor to scalar ratio.

The challenge to the single field slow-roll inflation imposed by the swampland criteria can be avoided by modifying the relationship between the tensor to scalar ratio and the slow-roll parameter.
We show that the Gauss-Bonnet inflation with the coupling function inversely proportional to the potential overcomes the challenge by adding a constant factor in the relationship between the tensor to scalar ratio and the slow-roll parameter.
For the Gauss-Bonnet inflation, while the swampland criteria are satisfied, the slow-roll conditions are also fulfilled, so the scalar spectral tilt and the tensor to scalar ratio are consistent with the observations.

Built on

A. A. Starobinsky, Phys. Lett. B. 91
1980
Earlier work this paper cites.
A. H. Guth, Phys. Rev. D 23
1981
Earlier work this paper cites.
K. Sato, Mon. Not. Roy. Astron. Soc. 195
1981
Earlier work this paper cites.
A. D. Linde, Phys. Lett. B 108
1982
Earlier work this paper cites.
A. Albrecht and P. J. Steinhardt, Phys. Rev. Lett. 48
1982
Earlier work this paper cites.
A. D. Linde, Phys. Lett. B 129
1983
Earlier work this paper cites.
J. Rizos and K. Tamvakis, Phys. Lett. B 326
1994
Earlier work this paper cites.
A. Berera, Phys. Rev. Lett. 75
1995
Earlier work this paper cites.
D. H. Lyth, Phys. Rev. Lett. 78
1997
Earlier work this paper cites.
P. Kanti, J. Rizos, and K. Tamvakis, Phys. Rev. D 59
1999
Earlier work this paper cites.
D. J. Schwarz, C. A. Terrero-Escalante, and A. A. Garcia, Phys. Lett. B 517
2001
Earlier work this paper cites.
C. Vafa, (2005), arXiv:hep-th/0509212 [hep-th]
2005
Earlier work this paper cites.
S. Nojiri, S. D. Odintsov, and M. Sasaki, Phys. Rev. D 71
2005
Earlier work this paper cites.
H. Ooguri and C. Vafa, Nucl. Phys. B 766
2007
Earlier work this paper cites.
Z.-K. Guo and D. J. Schwarz, Phys. Rev. D 81
Original
2010
Earlier work this paper cites.
R. Kallosh and A. Linde, JCAP 1310
Original
2013
Earlier work this paper cites.