Phasing out of Darkness: From Sterile Neutrino Dark Matter to Neutrino Masses via Time-Dependent Mixing

Abstract

Sterile neutrinos are a compelling candidate for generating neutrino masses and for elucidating the nature of dark matter. Astrophysical X-ray constraints on sterile neutrino dark matter decays, however, largely exclude the active-sterile mixing required to produce simultaneously the correct left-handed neutrino spectrum and keV-scale right-handed neutrino dark matter within a type-I seesaw framework. In this study, we demonstrate how these X-ray constraints can be circumvented through a time-dependent approach, thereby reviving a broad range of active-sterile mixing scenarios. Our minimal model incorporates two right-handed neutrinos, which form a two-component dark matter candidate, and an auxiliary scalar field that experiences a very late and still ongoing phase transition, leading to the spontaneous breaking of a global $U(1{)}_N$ symmetry. Prior to this phase transition, only the right-handed neutrinos are massive, while the left-handed neutrinos remain massless because of the scalar field's vanishing expectation value. As the phase transition develops, the growing expectation value of the scalar field increases the active-sterile mixing, thereby opening dark matter decay channels and inducing neutrino masses. The time dependence allows the scenario to be consistent with X-ray constraints as well as current measurements of left-handed neutrino masses. The anticipated level of active-sterile mixing today is within the detection capabilities of the forthcoming TRISTAN (KATRIN) tritium-beta decay project. Additionally, cosmological surveys such as DESI or EUCLID and supernova neutrino observations can test the prediction of massless left-handed neutrinos prior to the phase transition.

16+4 pages, 3 figures, matches published version

References in corpus (38)

• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• The Unity of Cosmological Attractors
• Particle Physics Implications of a Recent Test of the Gravitational Inverse Square Law
• Environmental Dependence of Masses and Coupling Constants
• Light Sterile Neutrinos: Models and Phenomenology
• Discovery of a 3.5 keV line in the Galactic Center and a Critical Look at the Origin of the Line Across Astronomical Targets
• Growing neutrinos and cosmological selection
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter
• Improved limits on the coupling of ultralight bosonic dark matter to photons from optical atomic clock comparisons
• Constraints on the parameters of radiatively decaying dark matter from the dark matter halo of the Milky Way and Ursa Minor
• Constraining DM properties with SPI
• A deep search for decaying dark matter with XMM-Newton blank-sky observations
• Restrictions on parameters of sterile neutrino dark matter from observations of galaxy clusters
• Limits on the Radiative Decay of Sterile Neutrino Dark Matter from the Unresolved Cosmic and Soft X-ray Backgrounds
• Strong Upper Limits on Sterile Neutrino Warm Dark Matter
• Search for the light dark matter with an X-ray spectrometer
• An X-ray Spectroscopic Search for Dark Matter in the Perseus Cluster with Suzaku
• Decaying dark matter search with NuSTAR deep sky observations
• RES-NOVA: A new neutrino observatory based on archaeological lead
• Inflation from Nilpotent Kähler Corrections
• Hubble-induced phase transitions on the lattice with applications to Ricci reheating
• Time-varying neutrino mass from a supercooled phase transition: current cosmological constraints and impact on the ${\Omega }_m$-${\sigma }_8$ plane
• Probing the nature of dark matter with Cosmic X-rays: Constraints from "Dark blobs" and grating spectra of galaxy clusters
• Quintessential inflation: A tale of emergent and broken symmetries
• Sterile neutrinos and right-handed currents in KATRIN
• Reconstruction of the neutrino mass as a function of redshift
• Towards Probing the Diffuse Supernova Neutrino Background in All Flavors
• Cosmology-friendly time-varying neutrino masses via the sterile neutrino portal
• Hubble-induced phase transitions: Walls are not forever
• The XMM Cluster Survey: new evidence for the 3.5 keV feature in clusters is inconsistent with a dark matter origin
• Endlessly flat scalar potentials and $\alpha$-attractors
• Strong limits on keV-scale galactic sterile neutrino dark matter with stray light from NuSTAR after 11 years of operation
• The diffuse supernova neutrino background as a probe of late-time neutrino mass generation
• Constraining dynamical neutrino mass generation with cosmological data
• Reviving keV sterile Neutrino Dark Matter
• Rocks, Water and Noble Liquids: Unfolding the Flavor Contents of Supernova Neutrinos
• From Hubble to Bubble

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