Cosmological gravitational particle production of stable spin-3/2 raritrons yields the observed dark matter abundance across wide ranges of mass relative to the Hubble scale at the end of inflation.
Gravitino Production After Inflation
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abstract
We investigate the production of gravitinos in a cosmological background. Gravitinos can be produced during preheating after inflation due to a combined effect of interactions with an oscillating inflaton field and absence of conformal invariance. In order to get insight on conformal properties of gravitino we reformulate phenomenological supergravity in SU(2,2|1)-symmetric way. The Planck mass and F- and D-terms appear via the gauge-fixed value of a superfield that we call conformon. We find that in general the probability of gravitino production is not suppressed by the small gravitational coupling. This may lead to a copious production of gravitinos after inflation. Efficiency of the new non-thermal mechanism of gravitino production is very sensitive to the choice of the underlying theory. This may put strong constraints on certain classes of inflationary models.
representative citing papers
A no-go theorem establishes that only the composite spin-1/2 Dirac fermion propagates as dark matter in the quadratic spinor Lagrangian, ruling out spin-3/2.
citing papers explorer
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Creation of spin-3/2 dark matter via cosmological gravitational particle production
Cosmological gravitational particle production of stable spin-3/2 raritrons yields the observed dark matter abundance across wide ranges of mass relative to the Hubble scale at the end of inflation.
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Dark matter from the quadratic spinor Lagrangian II: A spin-3/2 no-go and the uniqueness of the spin-1/2 candidate
A no-go theorem establishes that only the composite spin-1/2 Dirac fermion propagates as dark matter in the quadratic spinor Lagrangian, ruling out spin-3/2.