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The goldstone and goldstino of supersymmetric inflation

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  • Published: 01 October 2015
  • Volume 2015, article number 1, (2015)
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The goldstone and goldstino of supersymmetric inflation
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  • Yonatan Kahn1,
  • Daniel A. Roberts1 &
  • Jesse Thaler1 

  • 690 Accesses

  • 37 Citations

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A preprint version of the article is available at arXiv.

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 NL containing the goldstino and satisfying X 2 NL  = 0, and a real superfield B NL containing both the goldstino and the goldstone, satisfying X NL B NL  = B 3 NL  = 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.

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  1. Center for Theoretical Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, U.S.A.

    Yonatan Kahn, Daniel A. Roberts & Jesse Thaler

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  1. Yonatan Kahn
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Correspondence to Yonatan Kahn.

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ArXiv ePrint: 1504.05958

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Kahn, Y., Roberts, D.A. & Thaler, J. The goldstone and goldstino of supersymmetric inflation. J. High Energ. Phys. 2015, 1 (2015). https://doi.org/10.1007/JHEP10(2015)001

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  • Received: 05 May 2015

  • Accepted: 12 September 2015

  • Published: 01 October 2015

  • DOI: https://doi.org/10.1007/JHEP10(2015)001

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Keywords

  • Supersymmetric Effective Theories
  • Cosmology of Theories beyond the SM
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