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Title: Ultraviolet-Protected Inflation
Author: Germani, Cristiano
Kehagias, Alex
Keywords: Radiació ultraviolada
Ultraviolet radiation
Issue Date: 20-Apr-2011
Publisher: American Physical Society
Abstract: 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. This new unique interaction (a) keeps the theory perturbative in the whole inflationary trajectory, (b) preserves the tree-level shift invariance of the pseudo-Nambu-Goldstone boson, and (c) avoids the introduction of any new degrees of freedom with respect to standard natural inflation.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2011, vol. 106, num. 16, p. 161302
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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