12,000

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

93%

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

Home > Research > Publications & Outputs > Supergravity and two-field inflation effects in...
View graph of relations

« Back

Supergravity and two-field inflation effects in right-handed sneutrino modified D-term inflation.

Research output: Contribution to journalJournal article

Published

???articleNumber???063529
Journal publication date25/03/2008
JournalPhysical Review D
Journal number6
Volume77
Number of pages9
Original languageEnglish

Abstract

We extend previous work on the minimal D-term inflation model modified by right-handed (RH) sneutrino fields to include additional inflaton-sector supergravity corrections and two-field inflation effects. We show that supergravity corrections simultaneously allow ns to be within 3-year Wilkinson Microwave Anisotropy Probe limits and the cosmic string contribution to the cosmic microwave background (CMB) power spectrum to be less than 5%. For gauge coupling g<=1, the CMB contribution from cosmic strings is predicted to be at least 1% while the spectral index is predicted to be less than 0.968 for a CMB string contribution less than 5%. Treating the inflaton-RH sneutrino system as a two-field inflation model, we show that the time-dependence of the RH sneutrino field strongly modifies the single-field results for values of RH sneutrino mass mPhi>0.1H. The running spectral index is alpha[approximate]-0.0002 when mPhi<0.1H but increases to positive values as mPhi/H increases, with alpha>0.008 for mPhi>1.0H.

Bibliographic note

©2008 The American Physical Society