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http://hdl.handle.net/2445/132841
Title: | Ultraviolet-Protected Inflation |
Author: | Germani, Cristiano Kehagias, Alex |
Keywords: | Radiació ultraviolada Bosons Ultraviolet radiation Bosons |
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: https://doi.org/10.1103/PhysRevLett.106.161302 |
It is part of: | Physical Review Letters, 2011, vol. 106, num. 16, p. 161302 |
URI: | http://hdl.handle.net/2445/132841 |
Related resource: | https://doi.org/10.1103/PhysRevLett.106.161302 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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660017.pdf | 108.55 kB | Adobe PDF | View/Open |
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