Ultraviolet-protected inflation

Germani, C; Kehagias, A

dc.contributor.author	Germani, C	en
dc.contributor.author	Kehagias, A	en
dc.date.accessioned	2014-03-01T01:37:30Z
dc.date.available	2014-03-01T01:37:30Z
dc.date.issued	2011	en
dc.identifier.issn	0031-9007	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21531
dc.subject.classification	Physics, Multidisciplinary	en
dc.subject.other	Field values	en
dc.subject.other	Global shift	en
dc.subject.other	Radiative corrections	en
dc.subject.other	Shift invariance	en
dc.subject.other	Bosons	en
dc.title	Ultraviolet-protected inflation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevLett.106.161302	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevLett.106.161302	en
heal.identifier.secondary	161302	en
heal.language	English	en
heal.publicationDate	2011	en
heal.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 fMp, 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 fMp 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. © 2011 American Physical Society.	en
heal.publisher	AMER PHYSICAL SOC	en
heal.journalName	Physical Review Letters	en
dc.identifier.doi	10.1103/PhysRevLett.106.161302	en
dc.identifier.isi	ISI:000290096400003	en
dc.identifier.volume	106	en
dc.identifier.issue	16	en