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New inflation in supergravity after Planck and LHC
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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 mh = 126 GeV. However, the predicted spectral index n_s = 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.
Forward citations
Cited by 2 Pith papers
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Stochastic inflation with an extremely large number of $e$-folds
A shallow local minimum added to a hilltop inflation potential can make the typical number of e-folds as large as 10^(10^10), enough for light scalars to reach Bunch-Davies equilibrium.
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QCD Axion on Hilltop by a Phase Shift of $\pi$
A heavy axion inflaton can shift the QCD axion potential by π, placing the QCD axion at the hilltop and allowing f_a ≳ 3×10^9 GeV to explain all dark matter.
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