The goldstone and goldstino of supersymmetric inflation
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JHEP10(2015)001_pdfa.pdf
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Author(s)
Kahn, Yonatan Frederick
Thaler, Jesse
Roberts, Daniel Adam
Date Issued
October 2015
Journal
Journal of High Energy Physics
Publisher
Springer/SISSA
Citation
Kahn, Yonatan, Daniel A. Roberts, and Jesse Thaler. “The Goldstone and Goldstino of Supersymmetric Inflation.” J. High Energ. Phys. 2015, no. 10 (October 2015).
Version
Final published version
Abstract
We construct the minimal effective field theory (EFT) of supersymmetric inflation, whose field content is a real scalar, the goldstone for time-translation breaking, and a Weyl fermion, the goldstino for supersymmetry (SUSY) breaking. The inflating background can be viewed as a single SUSY-breaking sector, and the degrees of freedom can be efficiently parameterized using constrained superfields. Our EFT is comprised of a chiral superfield X [subscript NL] containing the goldstino and satisfying X [subscript NL] 2 = 0, and a real superfield B [subscript NL] containing both the goldstino and the goldstone, satisfying X [subscript NL] B [subscript NL] = B [subscript NL] 3 = 0. We match results from our EFT formalism to existing results for SUSY broken by a fluid background, showing that the goldstino propagates with subluminal velocities. The same effect can also be derived from the unitary gauge gravitino action after embedding our EFT in supergravity. If the gravitino mass is comparable to the Hubble scale during inflation, we identify a new parameter in the EFT related to a time-dependent phase of the gravitino mass parameter. We briefly comment on the leading contributions of goldstino loops to inflationary observables.
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/10.1007/JHEP10(2015)001
