Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-06-25
Nucl.Phys. B549 (1999) 391-406
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, Latex, 4 eps new figures included; an improved no-scale SUGRA model is presented; section 3 and 5 are new; accepted
Scientific paper
10.1016/S0550-3213(99)00177-7
We show that a particular class of effective low energy supergravity theories motivated by string theory can provide a promising framework for models of hybrid inflation in which the potential energy which drives inflation originates from the F-term of the effective supergravity theory. In the class of models considered the inflaton is protected from receiving mass during inflation by a generalisation of the Heisenberg symmetry present in no-scale supergravity models. The potential during inflation takes the positive definite form $V\sim |F_S|^2 + |F_T|^2 -3$, which allows the possibility that $V\ll m_{3/2}^2 M_P^2$ through the cancellation of the positive dilaton and moduli contribution against the negative term. We discuss a toy example where this is realised, then describe the application of this result to realistic models focusing on a particular example in which the $\mu$ problem and the strong CP-problem are addressed.
Bastero-Gil Mar
King Stephen F.
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