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2011-04-20

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/132841

Ultraviolet-Protected Inflation

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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.

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https://doi.org/10.1103/PhysRevLett.106.161302

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Radiació ultraviolada, Bosons

Subject (English)

Ultraviolet radiation, Bosons

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Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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GERMANI, Cristiano and KEHAGIAS, Alex. Ultraviolet-Protected Inflation. Physical Review Letters. 2011. Vol. 106, num. 16, pags. 161302. ISSN 0031-9007. [consulted: 9 of October of 2026]. Available at: https://hdl.handle.net/2445/132841

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