Sgoldstino inflation

We discuss the possibility that inflation is driven by the sgoldstino, the superpartner of the goldstino. Unlike in generic supergravity scenarios, the sgoldstino decouples from all other fields in the theory, which allows for a simple and robust inflationary model. We argue that the two-field model...

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Published inJournal of cosmology and astroparticle physics Vol. 2012; no. 8; p. 13
Main Authors Achúcarro, Ana, Mooij, Sander, Ortiz, Pablo, Postma, Marieke
Format Journal Article
LanguageEnglish
Published United States 01.08.2012
Subjects
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CAPTURE
COSMOLOGY
Inflation
INFLATIONARY UNIVERSE
INFLATONS
Parents
Phenomenology
SCALARS
SPARTICLES
Stability
SUPERGRAVITY
SUPERSYMMETRY
Trajectories
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Summary:We discuss the possibility that inflation is driven by the sgoldstino, the superpartner of the goldstino. Unlike in generic supergravity scenarios, the sgoldstino decouples from all other fields in the theory, which allows for a simple and robust inflationary model. We argue that the two-field model given by this single complex scalar correctly captures the full multifield inflationary phenomenology. On the other hand, the assumption of stability, along the entire inflationary trajectory, of the supersymmetry-preserving sector that is integrated out leads to supplementary constraints on the parent supergravity. We investigate small field, large field and hybrid sgoldstino inflation scenarios and provide some working examples. They are subject to the usual fine-tuning issues that are common to all supergravity models of inflation. We comment on some other recently proposed sgoldstino inflation models.
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/08/013