%0 Journal Article
%T Upper bound on the tensor-to-scalar ratio in GUT-scale supersymmetric hybrid inflation
%A Civiletti, M.
%A Pallis, C.
%A Shafi, Q.
%J Physics Letters B
%D 2014
%V 733
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F Civiletti_etal2014
%O WOS:000336430400048
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1805), last updated on Thu, 26 Jun 2014 10:18:22 +0000
%X We explore the upper bound on the tensor-to-scalar ratio r in supersymmetric (F-term) hybrid inflation models with the gauge symmetry breaking scale set equal to the value 2.86 . 10(16) GeV, as dictated by the unification of the MSSM gauge couplings. We employ a unique renormalizable superpotential and a quasi-canonical Kahler potential, and the scalar spectral index n(s) is required to lie within the two-sigma interval from the central value found by the Planck satellite. In a sizable region of the parameter space the potential along the inflationary trajectory is a monotonically increasing function of the inflaton, and for this case, r less than or similar to 2.9.10(-4), while the spectral index running, vertical bar dn(s)/d ln k vertical bar, can be as large as 0.01. Ignoring higher order terms which ensure the boundedness of the potential for large values of the inflaton, the upper bound on r is significantly larger, of order 0.01, for subplanckian values of the inflaton, and vertical bar dn(s)/dlnk vertical bar similar or equal to 0.006.
%R 10.1016/j.physletb.2014.04.060
%U http://arxiv.org/abs/1402.6254
%U https://doi.org/10.1016/j.physletb.2014.04.060
%P 276-282