New inflation in supergravity after Planck and LHC

作者：Takahashi Fuminobu^*

来源：Physics Letters B, 2013, 727(1-3): 21-26.

DOI：10.1016/j.physletb.2013.10.026

We revisit a single-field new inflation model based on a discrete R symmetry. Interestingly, the inflaton dynamics naturally leads to a heavy gravitino of mass m(3/2) = O(1-100) TeV, which is consistent with the standard-model like Higgs boson of mass m(h) similar or equal to 126 GeV. However, the predicted spectral index n(s) approximate to 0.94 is in tension with the Planck result, n(s) = 0.9603 +/- 0.073. We show that the spectral index can be increased by allowing a small constant term in the superpotential during inflation. The required size of the constant is close to the largest allowed, value for successful inflation, and it may be a result of a pressure toward larger values in the landscape. Alternatively, such constant term may arise in association with supersymmetry breaking required to cancel the negative cosmological constant from the inflaton sector.

• 出版日期2013-11