TY  - JOUR
AU  - Lazaries, G.
AU  - Pallis, C.
PY  - 2015
DA  - 2015//
TI  - Shift symmetry and Higgs inflation in supergravity with observable gravitational waves
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 114
EP  - 28pp
VL  - 11
IS  - 11
PB  - Springer
KW  - Cosmology of Theories beyond the SM
KW  - Supergravity Models
KW  - Supersymmetric Effective Theories
AB  - 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.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1508.06682
UR  - https://doi.org/10.1007/JHEP11(2015)114
DO  - 10.1007/JHEP11(2015)114
LA  - English
N1  - WOS:000365101200001
ID  - Lazaries+Pallis2015
ER  -