TY - JOUR

T1 - Higgs chaotic inflation and the primordial B-mode polarization discovered by BICEP2

AU - Nakayama, Kazunori

AU - Takahashi, Fuminobu

N1 - Funding Information:
This work was supported by the Grant-in-Aid for Scientific Research on Innovative Areas (No. 21111006 [K.N. and F.T.], No. 23104008 [F.T.], No. 24111702 [F.T.]), Scientific Research (A) (No. 22244030 [K.N. and F.T.], 21244033 [F.T.]), JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 ) [F.T.], and Inoue Foundation for Science [F.T.]. This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan.

PY - 2014/6/27

Y1 - 2014/6/27

N2 - We show that the standard model Higgs field can realize the quadratic chaotic inflation, if the kinetic term is significantly modified at large field values. This is a simple realization of the so-called running kinetic inflation. The point is that the Higgs field respects an approximate shift symmetry at high energy scale. The tensor-to-scalar ratio is predicted to be r ≃ 0.13-0.16, which nicely explains the primordial B-mode polarization, r=0.20-0.05+0.07, recently discovered by the BICEP2 experiment. In particular, allowing small modulations induced by the shift symmetry breaking, the negative running spectral index can also be induced. The reheating temperature is expected to be so high that successful thermal leptogenesis is possible. The suppressed quartic coupling of the Higgs field at high energy scales may be related to the Higgs chaotic inflation.

AB - We show that the standard model Higgs field can realize the quadratic chaotic inflation, if the kinetic term is significantly modified at large field values. This is a simple realization of the so-called running kinetic inflation. The point is that the Higgs field respects an approximate shift symmetry at high energy scale. The tensor-to-scalar ratio is predicted to be r ≃ 0.13-0.16, which nicely explains the primordial B-mode polarization, r=0.20-0.05+0.07, recently discovered by the BICEP2 experiment. In particular, allowing small modulations induced by the shift symmetry breaking, the negative running spectral index can also be induced. The reheating temperature is expected to be so high that successful thermal leptogenesis is possible. The suppressed quartic coupling of the Higgs field at high energy scales may be related to the Higgs chaotic inflation.

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U2 - 10.1016/j.physletb.2014.05.034

DO - 10.1016/j.physletb.2014.05.034

M3 - Article

AN - SCOPUS:84901461689

VL - 734

SP - 96

EP - 99

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -