Supergravity Modification of D-term Hybrid Inflation: Solving the Cosmic String and Spectral Index Problem via a Right-Handed Sneutrino.

McDonald, John and Lin, C. M. (2006) Supergravity Modification of D-term Hybrid Inflation: Solving the Cosmic String and Spectral Index Problem via a Right-Handed Sneutrino. Physical Review D, 74 (6). 063510. ISSN 1550-2368

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Abstract

Supergravity corrections due to the energy density of a right-handed sneutrino can generate a negative mass squared for the inflaton, flattening the inflaton potential and reducing the spectral index and inflaton energy density. For the case of D-term hybrid inflation, we show that the spectral index can be lowered from the conventional value n=0.98 to a value within the range favored by the latest WMAP analysis, n=0.951-0.019+0.015. The modified energy density is consistent with nonobservation of cosmic strings in the CMB if n<0.946. The WMAP lower bound on the spectral index implies that the D-term cosmic string contribution may be very close present CMB limits, contributing at least 5% to the CMB multipoles.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
One of the first papers to discuss the implications for inflation models of the latest 3-year WMAP CMB observations. It has generated new research on SUSY inflation models and cosmic strings. Basis of a new RTN collaboration with the Helsinki Institute of Physics (Ferrantelli and Enqvist). 14 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
2305
Deposited By:
Deposited On:
03 Apr 2008 15:01
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Mar 2020 02:23