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2010

UV-Protected Inflation

Germani, Cristiano, Kehagias, Alex

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In Natural Inflation, the Inflaton is a pseudo-Nambu-Goldstone boson which acquires a mass by explicit breaking of a global shift symmetry at scale f.

In this case, for small field values, the potential is flat and stable under radiative corrections.
Nevertheless, slow roll conditions enforce f>>M_p making the validity of the whole scenario questionable.
In this letter, we show that a coupling of the Inflaton kinetic term to the Einstein tensor allows f<<M_p by enhancing the gravitational friction acting on the Inflaton during inflation.

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