TY - JOUR
T1 - Multi-natural inflation in supergravity and BICEP2
AU - Czerny, Michael
AU - Higaki, Tetsutaro
AU - Takahashi, Fuminobu
N1 - Funding Information:
We thank Takeshi Kobayashi for useful discussion. This work was supported by JSPS Grant-in-Aid for Scientific Research on Innovative Areas (No. 24111702 , No. 21111006 , and No. 23104008 ) [F.T.], Scientific Research (A) (No. 22244030 and No. 21244033 ) [F.T.], and JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 [F.T.] and No. 25800169 [T.H.]), and Inoue Foundation for Science . This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan [F.T.].
PY - 2014/6/27
Y1 - 2014/6/27
N2 - We revisit the recently proposed multi-natural inflation and its realization in supergravity in light of the BICEP2 results. Multi-natural inflation is a single-field inflation model where the inflaton potential consists of multiple sinusoidal functions, and it is known that a sizable running spectral index can be generated, which relaxes the tension between the BICEP2 and the Planck results. In this paper we show that multi-natural inflation can accommodate a wide range of values of (n s, r), including the spectral index close to or even above unity. This will be favored if the tension is resolved by other sources such as dark radiation, hot dark matter, or non-zero neutrino mass. We also discuss the implications for the implementation in string theory.
AB - We revisit the recently proposed multi-natural inflation and its realization in supergravity in light of the BICEP2 results. Multi-natural inflation is a single-field inflation model where the inflaton potential consists of multiple sinusoidal functions, and it is known that a sizable running spectral index can be generated, which relaxes the tension between the BICEP2 and the Planck results. In this paper we show that multi-natural inflation can accommodate a wide range of values of (n s, r), including the spectral index close to or even above unity. This will be favored if the tension is resolved by other sources such as dark radiation, hot dark matter, or non-zero neutrino mass. We also discuss the implications for the implementation in string theory.
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U2 - 10.1016/j.physletb.2014.05.041
DO - 10.1016/j.physletb.2014.05.041
M3 - Article
AN - SCOPUS:84901764297
SN - 0370-2693
VL - 734
SP - 167
EP - 172
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -