We consider models of chaotic inflation driven by the real parts of a conjugate pair of Higgs superfields involved in the spontaneous breaking of a grand unification symmetry at a scale assuming its Supersymmetric ( SUSY ) value .
Employing Kähler potentials with a prominent shift-symmetric part proportional to c _ { - } and a tiny violation , proportional to c _ { + } , included in a logarithm we show that the inflationary observables provide an excellent match to the recent Planck and Bicep2 / Keck Array results setting , e.g. , 6.4 \cdot 10 ^ { -3 } \lesssim r _ { \pm } = c _ { + } / c _ { - } \lesssim 1 / N where N = 2 or 3 is the prefactor of the logarithm .
Deviations of these prefactors from their integer values above are also explored and a region where hilltop inflation occurs is localized .
Moreover , we analyze two distinct possible stabilization mechanisms for the non-inflaton accompanying superfield , one tied to higher order terms and one with just quadratic terms within the argument of a logarithm with positive prefactor N _ { S } < 6 .
In all cases , inflation can be attained for subplanckian inflaton values with the corresponding effective theories retaining the perturbative unitarity up to the Planck scale . Keywords : Cosmology of Theories Beyond the Standard Model , Supergravity Models ; PACS codes : 98.80.Cq , 11.30.Qc , 12.60.Jv , 04.65.+e Published in J. Cosmol .
Astropart .
Phys . 10 , 037 , no .
10 , ( 2016 )