Cosmology with orthogonal nilpotent superfields
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PhysRevD.93.043516.pdf
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Author(s)
Ferrara, Sergio
Kallosh, Renata
Thaler, Jesse
Date Issued
February 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Ferrara, Sergio, Renata Kallosh, and Jesse Thaler. "Cosmology with orthogonal nilpotent superfields." Phys. Rev. D 93, 043516 (February 2016).
Version
Final published version
Abstract
We study the application of a supersymmetric model with two constrained supermultiplets to inflationary cosmology. The first superfield S is a stabilizer chiral superfield satisfying a nilpotency condition of degree 2, S[superscript 2] = 0. The second superfield Φ is the inflaton chiral superfield, which can be combined into a real superfield B ≡ 1/2i(Φ - [bar over Φ). The real superfield B is orthogonal to S, SB = 0, and satisfies a nilpotency condition of degree 3, B[superscript 3] = 0. We show that these constraints remove from the spectrum the complex scalar sgoldstino, the real scalar inflaton partner (i.e. the “sinflaton”), and the fermionic inflatino. The corresponding supergravity model with de Sitter vacua describes a graviton, a massive gravitino, and one real scalar inflaton, with both the goldstino and inflatino being absent in unitary gauge. We also discuss relaxed superfield constraints where S[superscript 2] = 0 and S[bar over Φ] is chiral, which removes the sgoldstino and inflatino, but leaves the sinflaton in the spectrum. The cosmological model building in both of these inflatino-less models offers some advantages over existing constructions.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.043516
