Non-supersymmetric spin-3/2 dark matter with baryon-violating portals can explain the relic abundance through UV and Boltzmann-suppressed freeze-in, with viable parameter space constrained by indirect detection, direct detection, and LHC monojet searches.
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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.
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.
The QSL framework generates a geometric Dirac mass M_eff = (1/√6)|χ̇/χ| for spin-1/2 fermions from gravitational freeze-in, locked to H_* so that relic abundance depends on essentially one scale.
citing papers explorer
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Decaying spin-3/2 dark matter from baryon number violation
Non-supersymmetric spin-3/2 dark matter with baryon-violating portals can explain the relic abundance through UV and Boltzmann-suppressed freeze-in, with viable parameter space constrained by indirect detection, direct detection, and LHC monojet searches.
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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.
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Dark matter from the quadratic spinor Lagrangian I: Geometric mass for a gravitationally produced spin-1/2 fermion
The QSL framework generates a geometric Dirac mass M_eff = (1/√6)|χ̇/χ| for spin-1/2 fermions from gravitational freeze-in, locked to H_* so that relic abundance depends on essentially one scale.