DBI Inflation in N=1 Supergravity
arXiv:1208.0752 · doi:10.1103/PhysRevD.86.123510
Abstract
It was recently demonstrated that, when coupled to N=1 supergravity, the Dirac-Born-Infeld (DBI) action constructed from a single chiral superfield has the property that when the higher-derivative terms become important, the potential becomes negative. Thus, DBI inflation cannot occur in its most interesting, relativistic regime. In this paper, it is shown how to overcome this problem by coupling the model to one or more additional chiral supermultiplets. In this way, one obtains effective single real scalar field DBI models with arbitrary positive potentials, as well as multiple real scalar field DBI inflation models with hybrid potentials.
23 pages, 1 figure, v2: references added
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- On the Starobinsky Model of Inflation from Supergravity
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- The Ghost Condensate in N=1 Supergravity
- The Imaginary Starobinsky Model and Higher Curvature Corrections
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- Higher-Derivative Supergravity and Moduli Stabilization
- Higher-derivative supersymmetric effective field theories