Realizations of hybrid inflation in supergravity with natural initial conditions

Journal Article · Tue Mar 15 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.063516· OSTI ID:20706183

Panagiotakopoulos, C ^[1]

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1. Physics Division, School of Technology, Aristotle University of Thessaloniki, 54124 Thessaloniki (Greece)

We present viable F-term realizations of the hybrid inflationary scenario in the context of supergravity addressing at the same time the well-known problems of the initial conditions and of the adequate suppression of the inflaton mass. An essential role in our construction is played by decoupled superheavy fields without superpotential acquiring large vacuum expectation values due to D terms associated with anomalous U(1) gauge symmetries. The naturalness of the initial conditions is achieved through a chaotic inflation starting at energies close to the Planck scale and driven by the anomalous D terms. We discuss two distinct mechanisms leading to such an early chaotic D-term inflation which depend on the choice of the Kaehler potential involving the superheavy fields. The one relies on a choice of the Kaehler potential of the SU(1,1)/U(1) Kaehler manifold of the type encountered in no-scale supergravity whereas the other employs a more conventional choice for the Kaehler potential of the SU(1,1)/U(1) or SU(2)/U(1) Kaehler manifold but invokes rather specific values of the Fayet-Iliopoulos {xi} term. For such specific values of the {xi} term we exploit the existence of special classical nonoscillatory solutions describing inflationary expansion at both large and small inflaton field values. In the scenarios considered the superpotential is linear in the inflaton field associated with the observable inflation on account of a R symmetry and the suppression of the inflaton mass is a result of a cancellation between the always positive contribution of the decoupled superheavy fields and a negative contribution originating from the part of the Kaehler potential involving the inflaton.

• OSTI ID: 20706183
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHAOS THEORY
GAUGE INVARIANCE
INFLATIONARY UNIVERSE
MASS
MATHEMATICAL SOLUTIONS
POTENTIALS
SU GROUPS
SUPERGRAVITY
SYMMETRY
U-1 GROUPS