Primordial neutrinos and new physics: novel approach to solving neutrino Boltzmann equation

Abstract

Understanding how new physics influences the dynamics of cosmic neutrinos during their decoupling is crucial in light of upcoming precise cosmological observations and the need to reconcile cosmological and laboratory probes. Existing approaches to solving the neutrino Boltzmann equation are often model-dependent, computationally inefficient, and yield contradictory results. To solve this problem, we introduce a novel method to comprehensively study neutrino dynamics. We apply this method to several case studies, resolving the discrepancy in the literature about the impact of non-thermal neutrinos on $N_{\mathrm{eff}}$ and providing important insights about the role of decaying new physics particles on MeV plasma.

Version accepted for the publication in PRL

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Cited by in corpus (12)

• Lepton Flavor Asymmetries: from the early Universe to BBN
• How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach
• Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
• Fast and Flexible Neutrino Decoupling Part I: The Standard Model
• Primordial Black Holes Evaporating before Big Bang Nucleosynthesis
• No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
• Primordial neutrinos fade to gray: constraints from cosmological observables
• Precision calculation of $N_{\text{eff}}$ with Neutrino Direct Simulation Monte Carlo
• Neutrino Emission and Plasma Heating from Primordial Black Holes: An Improved Approach to $N_{\mathrm{eff}}$ Constraints
• Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look
• Boltzmann Equation Solver for Thermalization
• Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features