Linking Starobinsky-type inflation in no-scale supergravity to MSSM

Journal Article · Tue Apr 01 04:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/04/024· OSTI ID:22373640

A novel realization of the Starobinsky inflationary model within a moderate extension of the Minimal Supersymmetric Standard Model (MSSM) is presented. The proposed superpotential is uniquely determined by applying a continuous R and a Z{sub 2} discrete symmetry, whereas the Kähler potential is associated with a no-scale-type SU(54,1)/SU(54) × U(1){sub R} × Z{sub 2} Kähler manifold. The inflaton is identified with a Higgs-like modulus whose the vacuum expectation value controls the gravitational strength. Thanks to a strong enough coupling (with a parameter c{sub T} involved) between the inflaton and the Ricci scalar curvature, inflation can be attained even for subplanckian values of the inflaton with c{sub T} ≥ 76 and the corresponding effective theory being valid up to the Planck scale. The inflationary observables turn out to be in agreement with the current data and the inflaton mass is predicted to be 3·10{sup 13}GeV. At the cost of a relatively small superpotential coupling constant, the model offers also a resolution of the μ problem of MSSM for c{sub T} ≤ 4500 and gravitino heavier than about 10{sup 4}GeV. Supplementing MSSM by three right-handed neutrinos we show that spontaneously arising couplings between the inflaton and the particle content of MSSM not only ensure a sufficiently low reheating temperature but also support a scenario of non-thermal leptogenesis consistently with the neutrino oscillation parameters.

• OSTI ID: 22373640
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2014; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL INFLATION
COUPLING CONSTANTS
COUPLINGS
HIGGS BOSONS
HIGGS MODEL
NEUTRINO OSCILLATION
STANDARD MODEL
SUPERGRAVITY
SUPERSYMMETRY