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2014

The challenge for single field inflation with BICEP2 result

Gao, Qing, Gong, Yungui

Understand

The detection of B-mode power spectrum by the BICEP2 collaboration constrains the tensor-to-scalar ratio $r=0.20^{+0.07}_{-0.05}$ for the lensed-$\Lambda$CDM model.

The consistency of this big value with the {\em Planck} results requires a large running of the spectral index.
The large values of the tensor-to-scalar ratio and the running of the spectral index put a challenge to single field inflation.
For the chaotic inflation, the larger the value of the tensor-to-scalar ratio is, the smaller the value of the running of the spectral index is.

Built on

A. Albrecht and P.J. Steinhardt, Phys. Rev. Lett. 48 (1982) 1220
1982
Earlier work this paper cites.
A.D. Linde, Phys. Lett. B 129 (1983) 177
1983
Earlier work this paper cites.
K. Freese, J.A. Frieman, and A.V. Olinto, Phys. Rev. Lett. 65 (1990) 3233
1990
Earlier work this paper cites.
L. Boubekeur and D. Lyth, J. Cosmol. Astropart. Phys. 0507 (2005) 010
2005
Earlier work this paper cites.
I. Ben-Dayan and R. Brustein, J. Cosmol. Astropart. Phys. 1009 (2010) 007
2010
Earlier work this paper cites.
S. Hotchkiss, A. Mazumdar, and S. Nadathur, J. Cosmol. Astropart. Phys. 1202 (2012) 008
2012
Earlier work this paper cites.
P. Ade et al
Original
2013
Earlier work this paper cites.
P. Ade et al
Original
2013
Earlier work this paper cites.
P. Ade et al
Original
2014
Earlier work this paper cites.
R. Kallosh, A. Linde, and D. Roest, Phys. Rev. Lett. 112 (2014) 011303
2014
Earlier work this paper cites.
J. Lizarraga et al
Original
2014
Earlier work this paper cites.