We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Particle Production of Vector Fields: Scale Inv...
View graph of relations

« Back

Particle Production of Vector Fields: Scale Invariance is Attractive

Research output: Contribution to journalJournal article


Article number023523
Journal publication date25/01/2011
JournalPhysical Review D
Number of pages33
Original languageEnglish


In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared it is demonstrated that, under fairly general conditions during inflation, a scale-invariant spectrum of perturbations for the components of a vector field, massive or not, whose kinetic function (and mass) is modulated by the inflaton field is an attractor solution. If the field is massless, or if it remains light until the end of inflation, this attractor solution also generates anisotropic stress, which can render inflation weakly anisotropic. The above two characteristics of the attractor solution can source (independently or combined together) significant statistical anisotropy in the curvature perturbation, which may well be observable in the near future.

Bibliographic note

arXiv:1011.2517 [hep-ph] © 2011 American Physical Society

Related research outputs