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Ghost Condensate 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)

1212.2185
(Preprint), 353KB

PRD87_065022.pdf
(beliebiger Volltext), 312KB

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Zitation

Koehn, M., Lehners, J.-L., & Ovrut, B. (2013). Ghost Condensate in N=1 Supergravity. Physical Review D, 87(6): 065022. doi:10.1103/PhysRevD.87.065022.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000E-74B7-D
Zusammenfassung
We present the theory of a supersymmetric ghost condensate coupled to N=1 supergravity. This is accomplished using a general formalism for constructing locally supersymmetric higher-derivative chiral superfield actions. The theory admits a ghost condensate vacuum in de Sitter spacetime. Expanded around this vacuum, the scalar sector of the theory is shown to be ghost-free with no spatial gradient instabilities. By direct calculation, the fermion sector is found to consist of a massless chiral fermion and a massless gravitino. By analyzing the supersymmetry transformations, we find that the chiral fermion transforms inhomogeneously, indicating that the ghost condensate vacuum spontaneously breaks local supersymmetry with this field as the Goldstone fermion. Although potentially able to get a mass through the super-Higgs effect, the vanishing superpotential in the ghost condensate theory renders the gravitino massless. Thus local supersymmetry is broken without the super-Higgs effect taking place. This is in agreement with, and gives an explanation for, the direct calculation.