2007/10/31 by Chia-Min Lin, John McDonald, J. McDonald · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.77.063529
published as Phys.Rev.D77:063529,2008 · 22 pages LaTeX, 14 eps figures, to be published in Physical Review D
arxiv created 2008/03/13 · openalex publication_date 2008/03/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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\ensuremath≤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 m_\ensuremathΦ>0.1H. The running spectral index is \ensuremathα\ensuremath≈\ensuremath-0.0002 when m_\ensuremathΦ<0.1H but increases to positive values as m_\ensuremathΦ/H increases, with \ensuremathα>0.008 for m_\ensuremathΦ>1.0H.