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.

arXiv commentVersion accepted for the publication in PRL

References in corpus (43)

• The Simons Observatory: Science goals and forecasts
• The $\nu$MSM, Dark Matter and Baryon Asymmetry of the Universe
• The $\nu$MSM, Dark Matter and Neutrino Masses
• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• What is the lowest possible reheating temperature?
• Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
• Cosmological bounds on neutrino degeneracy improved by flavor oscillations
• MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles
• Serendipity in dark photon searches
• Neutrino decoupling including flavour oscillations and primordial nucleosynthesis
• A precision calculation of relic neutrino decoupling
• Analytical treatment of neutrino asymmetry equilibration from flavour oscillations in the early universe
• Neutrino decoupling in the early Universe
• Precision Early Universe Thermodynamics made simple: $N_{\mathrm{eff}}$ and Neutrino Decoupling in the Standard Model and beyond
• Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A
• Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise $N_{\mathrm{eff}}$ evaluation
• Updated constraints on non-standard neutrino interactions from Planck
• Neutrino energy transport in weak decoupling and big bang nucleosynthesis
• BBN for the LHC: constraints on lifetimes of the Higgs portal scalars
• Improved BBN constraints on Heavy Neutral Leptons
• Restrictions on the lifetime of sterile neutrinos from primordial nucleosynthesis
• Thermalisation of sterile neutrinos in the early Universe in the 3+1 scheme with full mixing matrix
• An Extended Analysis of Heavy Neutral Leptons during Big Bang Nucleosynthesis
• Phenomenology of GeV-scale scalar portal
• Mono-Neutrino at DUNE: New Signals From Neutrinophilic Thermal Dark Matter
• Metastable GeV-scale particles as a solution to the cosmological lithium problem
• Constraints on secret neutrino interactions after Planck
• Big Bang Nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe
• Cosmological beam dump: constraints on dark scalars mixed with the Higgs boson
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model III: Improved estimate of NLO contributions to the collision integral
• Cosmological Constraints on Neutrino Injection
• Primordial lepton asymmetries in the precision cosmology era: Current status and future sensitivities from BBN and the CMB
• Primordial neutrino asymmetry evolution with full mean-field effects and collisions
• What can CMB observations tell us about the neutrino distribution function?
• Sensitivities to feebly interacting particles: public and unified calculations
• Massive sterile neutrinos in the early universe: From thermal decoupling to cosmological constraints
• Constraints on primordial lepton asymmetries with full neutrino transport
• Lepton asymmetry, neutrino spectral distortions, and big bang nucleosynthesis
• Updated Constraints and Future Prospects on Majoron Dark Matter
• When FIMPs Decay into Neutrinos: The $N_{\mathrm{eff}}$ Story
• Cosmological radiation density with non-standard neutrino-electron interactions
• Effects of an Intermediate Mass Sterile Neutrino Population on the Early Universe
• How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach

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• 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