Tachyonic instabilities from post-inflation curvature reorganization via quadratic Gauss-Bonnet coupling produce the observed dark matter relic density across wide mass and scale ranges, backed by lattice simulations and a fitting function.
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Stiff-fluid reheating in Starobinsky inflation fits CMB+BAO at 1 sigma only if excluded by BBN radiation bounds, with remaining 2 sigma space testable by LISA, ET, DECIGO and BBO via blue-tilted GW spectrum.
Gravity-mediated production of scalar and vector dark radiation yields Planck 2018 constraints on reheating temperature T_RH and background equation of state w_Φ, with comparisons to right-handed neutrinos, ALPs, and a generic spin-2 mediator.
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Tachyonic gravitational dark matter production after inflation
Tachyonic instabilities from post-inflation curvature reorganization via quadratic Gauss-Bonnet coupling produce the observed dark matter relic density across wide mass and scale ranges, backed by lattice simulations and a fitting function.
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Reheating matters: Starobinsky inflation in light of joint CMB+BAO results and gravitational-wave forecasts
Stiff-fluid reheating in Starobinsky inflation fits CMB+BAO at 1 sigma only if excluded by BBN radiation bounds, with remaining 2 sigma space testable by LISA, ET, DECIGO and BBO via blue-tilted GW spectrum.