%0 Journal Article
%T Shift symmetry and Higgs inflation in supergravity with observable gravitational waves
%A Lazaries, G.
%A Pallis, C.
%J Journal of High Energy Physics
%D 2015
%V 11
%N 11
%I Springer
%@ 1029-8479
%G English
%F Lazaries+Pallis2015
%O WOS:000365101200001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2467), last updated on Thu, 17 Dec 2015 14:38:33 +0000
%X We demonstrate how to realize within supergravity a novel chaotic-type inflationary scenario driven by the radial parts of a conjugate pair of Higgs superfields causing the spontaneous breaking of a grand unified gauge symmetry at a scale assuming the value of the supersymmetric grand unification scale. The superpotential is uniquely determined at the renormalizable level by the gauge symmetry and a continuous R symmetry. We select two types of Kahler potentials, which respect these symmetries as well as an approximate shift symmetry. In particular, they include in a logarithm a dominant shift-symmetric term proportional to a parameter c_ together with a small term violating this symmetry and characterized by a parameter c(+). In both cases, imposing a lower bound on c_, inflation can be attained with subplanckian values of the original inflaton, while the corresponding effective theory respects perturbative unitarity for r +/- = c(+)/c_ <= 1. These inflationary models do not lead to overproduction of cosmic defects, are largely independent of the one-loop radiative corrections and accommodate, for natural values of r +/-, observable gravitational waves consistently with all the current observational data. The inflaton mass is mostly confined in the range (3.7 – 8.1) x 10(10) GeV.
%K Cosmology of Theories beyond the SM
%K Supergravity Models
%K Supersymmetric Effective Theories
%R 10.1007/JHEP11(2015)114
%U http://arxiv.org/abs/1508.06682
%U https://doi.org/10.1007/JHEP11(2015)114
%P 114-28pp