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Journal Article

DBI Inflation in N=1 Supergravity

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons26307

Koehn,  Michael
String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons16239

Lehners,  Jean-Luc
String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1208.0752
(Preprint), 538KB

PRD86_123510.pdf
(Any fulltext), 371KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Koehn, M., Lehners, J.-L., & Ovrut, B. A. (2012). DBI Inflation in N=1 Supergravity. Physical Review D, 86(12): 123510. doi:10.1103/PhysRevD.86.123510.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-0D13-F
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.