Neutrino Interactions in the Late Universe

Abstract

The cosmic neutrino background is both a dramatic prediction of the hot Big Bang and a compelling target for current and future observations. The impact of relativistic neutrinos in the early universe has been observed at high significance in a number of cosmological probes. In addition, the non-zero mass of neutrinos alters the growth of structure at late times, and this signature is a target for a number of upcoming surveys. These measurements are sensitive to the physics of the neutrino and could be used to probe physics beyond the standard model in the neutrino sector. We explore an intriguing possibility where light right-handed neutrinos are coupled to all, or a fraction of, the dark matter through a mediator. In a wide range of parameter space, this interaction only becomes important at late times and is uniquely probed by late-time cosmological observables. Due to this coupling, the dark matter and neutrinos behave as a single fluid with a non-trivial sound speed, leading to a suppression of power on small scales. In current and near-term cosmological surveys, this signature is equivalent to an increase in the sum of the neutrino masses. Given current limits, we show that at most 0.5% of the dark matter could be coupled to neutrinos in this way.

arXiv comment24 pages, 3 figures

References in corpus (62)

• The NumPy array: a structure for efficient numerical computation
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Massive neutrinos and cosmology
• Big Bang Nucleosynthesis: 2015
• Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
• LSST Science Book, Version 2.0
• Cosmological Non-Linearities as an Effective Fluid
• Theory of Neutrinos: A White Paper
• Light Sterile Neutrinos: A White Paper
• Weighing Neutrinos with Galaxy Surveys
• CMB-S4 Science Case, Reference Design, and Project Plan
• Signatures of Relativistic Neutrinos in CMB Anisotropy and Matter Clustering
• CMB-S4 Science Book, First Edition
• The Phenomenology of Right Handed Neutrinos
• Constraining Dark Matter-Baryon Scattering with Linear Cosmology
• DESI and other dark energy experiments in the era of neutrino mass measurements
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in Fourier-space
• Neutrino mass from Cosmology
• Determining Neutrino Mass from the CMB Alone
• Towards a cosmological neutrino mass detection
• Planck 2018 results. VI. Cosmological parameters
• Reducing the $H_0$ and ${\sigma }_8$ tensions with Dark Matter-neutrino interactions
• Phases of New Physics in the CMB
• A First Detection of the Acoustic Oscillation Phase Shift Expected from the Cosmic Neutrino Background
• Limits on Neutrino-Neutrino Scattering in the Early Universe
• Constraints on scattering of keV--TeV dark matter with protons in the early Universe
• Constraining Dark Matter-Neutrino Interactions using the CMB and Large-Scale Structure
• Neutrino mass in cosmology: status and prospects
• The LiteBIRD Satellite Mission - Sub-Kelvin Instrument
• Neutrino Portals to Dark Matter
• Solving the Hierarchy Problem Discretely
• Are small neutrino masses unveiling the missing mass problem of the Universe?
• Cosmology with self-interacting sterile neutrinos and dark matter - A pseudoscalar model
• Light and Superlight Sterile Neutrinos in the Minimal Radiative Inverse Seesaw Model
• Thermal Dark Matter Through the Dirac Neutrino Portal
• Cosmological Limits on the Neutrino Mass and Lifetime
• Phases of New Physics in the BAO Spectrum
• The Cosmology Large Angular Scale Surveyor
• Cosmological constraints on neutrino self-interactions with a light mediator
• First Constraint on the Neutrino-Induced Phase Shift in the BAO Spectrum
• Cosmological Constraints on Interacting Light Particles
• Matter Power Spectrum in Hidden Neutrino Interacting Dark Matter Models: A Closer Look at the Collision Term
• Cosmological constraints on multi-interacting dark matter
• $\Lambda$CDM or self-interacting neutrinos? - how CMB data can tell the two models apart
• Flavor-specific Interaction Favors Strong Neutrino Self-coupling in the Early Universe
• Detecting patchy reionization in the CMB
• Dark Neutrino interactions phase out the Hubble tension
• Neutrino masses and beyond-$\Lambda$CDM cosmology with LSST and future CMB experiments
• Fundamental Physics from Future Weak-Lensing Calibrated Sunyaev-Zel'dovich Galaxy Cluster Counts
• Dark Energy Radiation
• Determining the Neutrino Lifetime from Cosmology
• The full Boltzmann hierarchy for dark matter-massive neutrino interactions
• Relaxation of the Cosmological Constant
• Neutrino Mass from Cosmology: Probing Physics Beyond the Standard Model
• Comprehensive Study of Neutrino-Dark Matter Mixed Damping
• Dark Matter Interactions, Helium, and the CMB
• Born Again Universe
• Status of neutrino properties and future prospects - Cosmological and astrophysical constraints
• The Phase of the BAO on Observable Scales
• Reducing cosmological small scale structure via a large dark matter-neutrino interaction: constraints and consequences
• Is it Mixed dark matter or neutrino masses?
• Phenomenology of a Neutrino-DM Coupling: The Scalar Case

Cited by in corpus (6)

• Probing neutrino interactions and dark radiation with gravitational waves
• Neutrino bound states and bound systems
• X-ray morphology of cluster-mass haloes in self-interacting dark matter
• Dark matter produced from neutrinos
• Characterising Dark Matter-induced neutrino potentials
• Cosmological Implications of a Neutrino Mass Detection