Running kinetic inflation

By K. Nakayama, F. Takahashi. 2010

137 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8fe1f58349c6c707ca9108be3dbf536e01652c91

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Citations in the corpus

Flaxion: a minimal extension to solve puzzles in the standard model (2016, background): “The idea is to extend the flavon kinetic term to effectively flatten the potential at large field value [67, 68].”
Violent preheating in inflation with nonminimal coupling (2016, methodology): “As an example, let us consider the following action as assumed in the running kinetic inflation model [42, 43]:”
Simple exercises to flatten your potential (2010, background): “The backreaction of the inflationary potential on the geometry can also affect the kinetic term, realizing the “running kinetic term” mechanism described in [34].”
Cosmology with nilpotent superfields (2014, methodology): “in [38–52] can be now modified and used in the new construction with the nilpotent superfield.”