Cosmology with orthogonal nilpotent superfields
Author(s)Ferrara, Sergio; Kallosh, Renata; Thaler, Jesse
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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.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
Ferrara, Sergio, Renata Kallosh, and Jesse Thaler. "Cosmology with orthogonal nilpotent superfields." Phys. Rev. D 93, 043516 (February 2016).
Final published version