Probing sub-eV Dark Matter decays with PTOLEMY

Abstract

When the Dark Matter mass is below the eV-scale, its cosmological occupation number exceeds the ones of photons from the cosmic microwave background as well as of relic neutrinos. If such Dark Matter decays to pairs of neutrinos, it implies that experiments that seek the detection of the cosmic neutrino background may as well be sensitive to this additional form of "dark radiation". Here we study the prospects for detection taking into account various options for the forecasted performance of the future PTOLEMY experiment. From a detailed profile likelihood analysis we find that Dark Matter decays with lifetime as large as $10^4$ Gyr or a sub-% Dark Matter fraction decaying today can be discovered. The prospects are facilitated by the distinct spectral event shape that is introduced from galactic and cosmological neutrino dark radiation fluxes. In the process we also clarify the importance of Pauli-blocking in the Dark Matter decay. The scenarios presented in this work can be considered early physics targets in the development of these instruments with relaxed demands on performance and energy resolution.

References in corpus (33)

• Cold dark matter haloes in the Planck era: evolution of structural parameters for Einasto and NFW profiles
• Dark matter annihilation at the galactic center
• Implication of neutrino backgrounds on the reach of next generation dark matter direct detection experiments
• A Dark-Matter Spike at the Galactic Center?
• A lower bound on the mass of Dark Matter particles
• Gravitational clustering of relic neutrinos and implications for their detection
• A fresh look at linear cosmological constraints on a decaying dark matter component
• Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case
• Directional Detection of Dark Matter with Two-Dimensional Targets
• Grand Unified Neutrino Spectrum at Earth: Sources and Spectral Components
• Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential
• Small neutrino masses from gravitational $\theta$-term
• Decaying dark matter and the tension in ${\sigma }_8$
• Model-Independent Bound on the Dark Matter Lifetime
• Neutrino Lines from Majoron Dark Matter
• Testing MeV dark matter with neutrino detectors
• Development of a Relic Neutrino Detection Experiment at PTOLEMY: Princeton Tritium Observatory for Light, Early-Universe, Massive-Neutrino Yield
• Expected Signals in Relic Neutrino Detectors
• Absorption of Fermionic Dark Matter by Nuclear Targets
• New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
• Signatures of Dark Radiation in Neutrino and Dark Matter Detectors
• Possible Capture of keV Sterile Neutrino Dark Matter on Radioactive beta-decaying Nuclei
• Detection prospects for the Cosmic Neutrino Background using laser interferometers
• Stellar Basins of Gravitationally Bound Particles
• On How Neutrino Protects the Axion
• KATRIN: A next generation tritium beta decay experiment with sub-eV sensitivity for the electron neutrino mass
• Probing Low Energy Neutrino Backgrounds with Neutrino Capture on Beta Decaying Nuclei
• Direct Detection of the Cosmic Neutrino Background Including Light Sterile Neutrinos
• Solar neutrino flux at keV energies
• Cosmic neutrino background search experiments as decaying dark matter detectors
• Detecting a Secondary Cosmic Neutrino Background from Majoron Decays in Neutrino Capture Experiments
• Precise Capture Rates of Cosmic Neutrinos and Their Implications on Cosmology
• The neutrino-floor in the presence of dark radation

Cited by in corpus (5)

• Unstable Cosmic Neutrino Capture
• Neutrino astronomy as a probe of physics beyond the Standard Model: decay of sub-MeV $B$-$L$ gauge boson dark matter
• Terrestrial Probes of Electromagnetically Interacting Dark Radiation
• Probing sterile neutrino dark matter in the PTOLEMY-like experiment
• Shining Light on Cosmogenic Axions with Neutrino Experiments