The goldstone and goldstino of supersymmetric inflation

Kahn, Yonatan; Roberts, Daniel A.; Thaler, Jesse

doi:10.1007/JHEP10(2015)001

Title: The goldstone and goldstino of supersymmetric inflation

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP10(2015)001· OSTI ID:1253894

Kahn, Yonatan ^[1]; Roberts, Daniel A. ^[1]; Thaler, Jesse ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, 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 X²_NL = 0, and a real superfield B_NL containing both the goldstino and the goldstone, satisfying X_NL B_NL = B³_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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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012567

OSTI ID:: 1253894

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 10; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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