Dissipation of small-scale primordial perturbations after neutrino decoupling cools relic neutrinos and reduces their abundance, enabling PTOLEMY to constrain the primordial curvature power spectrum to O(0.1) on scales k ≲ 3×10^5 Mpc^{-1}.
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Updated bounds on constant and redshift-dependent neutrino degeneracy parameters are derived from Planck+SPT+ACT CMB, DESI BAO, and BBN data, with a reported 95% CL preference for non-zero positive ξ_νe at BBN in the non-degenerate scenario.
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Probing the small-scale primordial power spectrum via relic neutrinos and acoustic reheating
Dissipation of small-scale primordial perturbations after neutrino decoupling cools relic neutrinos and reduces their abundance, enabling PTOLEMY to constrain the primordial curvature power spectrum to O(0.1) on scales k ≲ 3×10^5 Mpc^{-1}.
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Probing the neutrino chemical potential with cosmological observations
Updated bounds on constant and redshift-dependent neutrino degeneracy parameters are derived from Planck+SPT+ACT CMB, DESI BAO, and BBN data, with a reported 95% CL preference for non-zero positive ξ_νe at BBN in the non-degenerate scenario.