Neutrino Direct Simulation Monte Carlo: Accurate modeling of out-of-equilibrium decaying cosmological relics

arXiv:2609.31833 · hep-ph, astro-ph.CO · Submitted 2026-09-25 · Read on arXiv

hep-ph, astro-ph.CO

Submitted: 2026-09-25

Updated: 2026-09-25

Code: https://github.com/maksymovchynnikov/nuDSMC

Terminology

• Abundance — 67× in this paper · explained in 1 episode
• Decoupling — 43× in this paper · explained in 2 episodes
• Reheating — 41× in this paper · explained in 2 episodes
• Benchmark — 22× in this paper · explained in 2 episodes
• Accuracy — 8× in this paper · explained in 1 episode
• Trace — 7× in this paper · explained in 2 episodes
• Boltzmann Equation — 4× in this paper · explained in 2 episodes
• Consistency — 3× in this paper · explained in 3 episodes
• Majorant Collision Frequency — 3× in this paper
• Spectral Distortions — 2× in this paper · explained in 2 episodes
• Adiabatic Transfer of Averaged Oscillations — 1× in this paper
• Conservation Laws — 1× in this paper · explained in 3 episodes

Sources

• Primordial neutrino asymmetry evolution with full mean-field effects and collisions
• Constraints on primordial lepton asymmetries with full neutrino transport
• Lepton Flavor Asymmetries: from the early Universe to BBN
• A Limit on the Total Lepton Number in the Universe from BBN and the CMB
• Updated constraints on non-standard neutrino interactions from Planck
• Constraints on secret neutrino interactions after Planck
• Cosmological radiation density with non-standard neutrino-electron interactions
• Neutrino non-standard interactions meet precision measurements of $N_{\rm eff}$
• Big Bang Nucleosynthesis as a probe of non-standard neutrino interactions and non-unitary three-neutrino mixing
• Impact of non-standard neutrino-electron interactions on Big Bang Nucleosynthesis
• Metastable GeV-scale particles as a solution to the cosmological lithium problem
• Cosmological beam dump: constraints on dark scalars mixed with the Higgs boson
• Big Bang Nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe
• An Extended Analysis of Heavy Neutral Leptons during Big Bang Nucleosynthesis
• Improved BBN constraints on Heavy Neutral Leptons
• When FIMPs Decay into Neutrinos: The $N_\mathrm{eff}$ Story
• Massive sterile neutrinos in the early universe: From thermal decoupling to cosmological constraints
• Effects of an Intermediate Mass Sterile Neutrino Population on the Early Universe
• New physics decaying into metastable particles: impact on cosmic neutrinos
• Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma

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