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2014

Simple realization of inflaton potential on a Riemann surface

Harigaya, Keisuke, Ibe, Masahiro

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The observation of the B-mode in the cosmic microwave background radiation combined with the so-called Lyth bound suggests the trans-Planckian variation of the inflaton field during inflation.

Such a large variation generates concerns over inflation models in terms of the effective field theory below the Planck scale.
If the inflaton resides in a Riemann surface and the inflaton potential is a multivalued function of the inflaton field when it is viewed as a function on a complex plane, the Lyth bound can be satisfied while keeping field values in the effective field theory within the Planck scale.
We show that a multivalued inflaton potential can be realized starting from a single-valued Lagrangian of the effective field theory below the Planck scale.

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