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Dynamical breaking of shift-symmetry in supergravity-based inflation · Around

2014

Dynamical breaking of shift-symmetry in supergravity-based inflation

Mazumdar, Anupam, Noumi, Toshifumi, Yamaguchi, Masahide

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Shift-symmetry is essential to protect the flatness of the potential, even beyond the super-Planckian vacuum expectation value (VEV) for an inflaton field.

The breaking of the shift-symmetry can yield potentials suitable for super-Planckian excursion of the inflaton.
The aim of this paper is to illustrate that it is indeed possible to break the shift-symmetry dynamically within 4 dimensional supergravity prior to a long phase of inflation.
Thanks to the shift-symmetry, the leading contribu- tion to the inflaton potential is free from the dangerous exponential factor even after its breaking, which is the main obstacle to realizing the super-Planckian inflation in supergravity.

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