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DBI Inflation in N=1 Supergravity

MPG-Autoren
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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Volltexte (frei zugänglich)

1208.0752
(Preprint), 538KB

PRD86_123510.pdf
(beliebiger Volltext), 371KB

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Zitation

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.


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