TY - JOUR
T1 - Slow and safe gravitinos
AU - Dudas, Emilian
AU - Garcia, Marcos A.G.
AU - Mambrini, Yann
AU - Olive, Keith A.
AU - Peloso, Marco
AU - Verner, Sarunas
N1 - Publisher Copyright:
© 2021 authors.
PY - 2021/6/9
Y1 - 2021/6/9
N2 - It has been argued that supergravity models of inflation with vanishing sound speeds, cs, lead to an unbounded growth in the production rate of gravitinos. We consider several models of inflation to delineate the conditions for which cs=0. In models with unconstrained superfields, we argue that the mixing of the Goldstino and inflatino in a time-varying background prevents the uncontrolled production of the longitudinal modes. This conclusion is unchanged if there is a nilpotent field associated with supersymmetry breaking with constraint S2=0, i.e., (s)Goldstino-less models. Models with a second orthogonal constraint, S(φ-φ¯)=0, where φ is the inflaton superfield, which eliminates the inflatino, may suffer from the overproduction of gravitinos. However, we point out that these models may be problematic if this constraint originates from a UV Lagrangian, as this may require using higher derivative operators. These models may also exhibit other pathologies, such as cs>1, which are absent in theories with the single constraint or unconstrained fields.
AB - It has been argued that supergravity models of inflation with vanishing sound speeds, cs, lead to an unbounded growth in the production rate of gravitinos. We consider several models of inflation to delineate the conditions for which cs=0. In models with unconstrained superfields, we argue that the mixing of the Goldstino and inflatino in a time-varying background prevents the uncontrolled production of the longitudinal modes. This conclusion is unchanged if there is a nilpotent field associated with supersymmetry breaking with constraint S2=0, i.e., (s)Goldstino-less models. Models with a second orthogonal constraint, S(φ-φ¯)=0, where φ is the inflaton superfield, which eliminates the inflatino, may suffer from the overproduction of gravitinos. However, we point out that these models may be problematic if this constraint originates from a UV Lagrangian, as this may require using higher derivative operators. These models may also exhibit other pathologies, such as cs>1, which are absent in theories with the single constraint or unconstrained fields.
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U2 - 10.1103/PhysRevD.103.123519
DO - 10.1103/PhysRevD.103.123519
M3 - Article
AN - SCOPUS:85108292918
SN - 2470-0010
VL - 103
JO - Physical Review D
JF - Physical Review D
IS - 12
M1 - 123519
ER -