Running Kinetic Inflation

Abstract

We study a recently proposed running kinetic inflation model in which the inflaton potential becomes flat due to rapid growth of the kinetic term at large inflaton field values. As concrete examples, we build a variety of chaotic inflation models in supergravity with e.g. quadratic, linear, and fractional-power potentials. The power of the potential generically increases after inflation, and the inflaton is often massless at the potential minimum in the supersymmetric limit, which leads to many interesting phenomena. First, the light inflaton mass greatly relaxes severe thermal and non-thermal gravitino problems. Secondly, the kination epoch is naturally present after inflation, which may enhance the gravity waves. Thirdly, since the inflaton is light, it is likely coupled to the Higgs sector for successful reheating. The inflaton and its superpartner, inflatino, may be produced at the LHC. Interestingly, the inflatino can be dark matter, if it is the lightest supersymmetric particle.

30 pages, 7 figures. v2: references added

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• Inflationary cosmology and the standard model Higgs with a small Hubble induced mass
• Multi-Natural Inflation in Supergravity
• Resurrecting Quadratic Inflation in No-Scale Supergravity in Light of BICEP2
• Potential-driven Galileon inflation
• Two-Field Analysis of No-Scale Supergravity Inflation
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• General Analysis of Inflation in the Jordan frame Supergravity
• Higgs inflation and suppression of axion isocurvature perturbation
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• Nonthermal Gravitino Production after Large Field Inflation
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• Chaotic inflation and unitarity problem
• Preheating from target space curvature and unitarity violation: Analysis in field space
• Why have supersymmetric particles not been observed?
• Dark Matter Chaotic Inflation in Light of BICEP2
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• Gravitino Problem in Supergravity Chaotic Inflation and SUSY Breaking Scale after BICEP2
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• Introduction to the number of $e$-folds in slow-roll inflation
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• Resolving primordial physics through correlated signatures
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• Towards a realistic solution of the cosmological constant fine-tuning problem by Higgs inflation
• Neutrino Mass, Vacuum Stability and Higgs Inflation with Vector-Like Quarks and a Single Right-Handed Neutrino
• Intermediate inflation in generalized non-minimal derivative coupling model