Supergravity modification of D-term hybrid inflation: Solving the cosmic string and spectral index problems via a right-handed sneutrino

Chia-Min Lin and John McDonald
Phys. Rev. D 74, 063510 – Published 13 September 2006

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=0.9510.019+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.

  • Figure
  • Figure
  • Received 1 June 2006

DOI:https://doi.org/10.1103/PhysRevD.74.063510

©2006 American Physical Society

Authors & Affiliations

Chia-Min Lin* and John McDonald

  • Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB, Unnited Kingdom

  • *c.lin3@lancaster.ac.uk
  • j.mcdonald@lancaster.ac.uk

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 74, Iss. 6 — 15 September 2006

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×