No-Scale Ripple Inflation Revisited

Abstract

We revisit the no-scale ripple inflation model, where no-scale supergravity is modified by an additional term for the inflaton field in the Kahler potential. This term not only breaks one SU(N,1) symmetry explicitly, but also plays an important role for inflation. We generalize the superpotential in the no-scale ripple inflation model slightly. There exists a discrete Z_2 symmetry/parity in the scalar potential in general, which can be preserved or violated by the non-canonical nomalized inflaton kinetic term. Thus, there are three inflation paths: one parity invariant path, and the left and right paths for parity violating scenario. We show that the inflations along the parity invariant path and right path are consistent with the Planck results. However, the gavitino mass for the parity invariant path is so large that the inflation results will be invalid if we consider the inflaton supersymmetry breaking soft mass term. Thus, only the inflation along the right path gives the correct and consistent results. Notably, the tensor-to-scalar ratio in such case can be large, with a value around 0.05, which may be probed by the future Planck experiment.

Revtex4, 16 pages, 6 figures, version to appear in JCAP

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• Keeping the relation between the Starobinsky model and no-scale supergravity ACTive
• Supergravity Inflation with Broken Shift Symmetry and Large Tensor-to-Scalar Ratio
• Unified No-Scale Attractors
• Starobinsky-Like Inflation and Neutrino Masses in a No-Scale SO(10) Model
• Helical Phase Inflation
• Modified Lyth bound and implications of BICEP2 results
• Phenomenology and Cosmology of No-Scale Attractor Models of Inflation
• From $R^2$ Gravity to No-Scale Supergravity
• The Simple Single Field Inflation Models and the Running of Spectral Index
• From Minkowski to de Sitter in Multifield No-Scale Models
• Multi-field inflation and the field-space metric
• A note on supergravity inflation in braneworld