Cosmic Neutrino Background Detection in Large-Neutrino-Mass Cosmologies

Abstract

The Cosmic Neutrino Background (CNB) is a definite prediction of the standard cosmological model and its direct discovery would represent a milestone in cosmology and neutrino physics. In this work, we consider the capture of relic neutrinos on a tritium target as a possible way to detect the CNB, as aimed for by the PTOLEMY project. Crucial parameters for this measurement are the absolute neutrino mass $m_{\nu }$ and the local neutrino number density $n_{\nu }^{\mathrm{loc}}$. Within the $\Lambda$CDM model, cosmology provides a stringent upper limit on the sum of neutrino masses of $\sum m_{\nu }<0.12\mathrm{eV}$, with further improvements expected soon from galaxy surveys by DESI and EUCLID. This makes the prospects for a CNB detection and a neutrino mass measurement in the laboratory very difficult. In this context, we consider a set of non-standard cosmological models that allow for large neutrino masses ($m_{\nu }\sim 1\mathrm{eV}$), potentially in reach of the KATRIN neutrino mass experiment or upcoming neutrinoless double-beta decay searches. We show that the CNB detection prospects could be much higher in some of these models compared to those in $\Lambda$CDM, and discuss the potential for such a detection to discriminate between cosmological scenarios. Moreover, we provide a simple rule to estimate the required values of energy resolution, exposure, and background rate for a PTOLEMY-like experiment to cover a certain region in the $(m_{\nu },n_{\nu }^{\mathrm{loc}})$ parameter space. Alongside this paper, we publicly release a code to calculate the CNB sensitivity in a given cosmological model.

16 pages, 4 figures, 1 table. Code available at https://github.com/james-alvey-42/DistNuAndPtolemy. Minor modifications, some references added. Matches published version in PRD

References in corpus (22)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Relic neutrino decoupling with flavour oscillations revisited
• A precision calculation of relic neutrino decoupling
• Growing Matter
• Growing neutrinos and cosmological selection
• Determining the neutrino mass with Cyclotron Radiation Emission Spectroscopy - Project 8
• On the most constraining cosmological neutrino mass bounds
• Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• Primordial Deuterium after LUNA: concordances and error budget
• Direct Measurements of Neutrino Mass
• Invisible neutrino decay in precision cosmology
• Time-varying neutrino mass from a supercooled phase transition: current cosmological constraints and impact on the ${\Omega }_m$-${\sigma }_8$ plane
• Calculation of the local density of relic neutrinos
• Prospects for cosmic neutrino detection in tritium experiments in the case of hierarchical neutrino masses
• How to relax the cosmological neutrino mass bound
• Reconstruction of the neutrino mass as a function of redshift
• What can CMB observations tell us about the neutrino distribution function?
• Neutrino lumps and the Cosmic Microwave Background
• Neutrino clustering in the Milky Way and beyond
• Dynamics of neutrino lumps in growing neutrino quintessence
• First direct neutrino-mass measurement with sub-eV sensitivity

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• Quantifying the tension between cosmological and terrestrial constraints on neutrino masses
• Influence of local structure on relic neutrino abundances and anisotropies
• Neutrino mass tension or suppressed growth rate of matter perturbations?
• Upper Limits on the Cosmic Neutrino Background from Cosmic Rays
• A review of neutrino decoupling from the early universe to the current universe
• Impact of the damping tail on neutrino mass constraints
• Large neutrino mass in cosmology and keV sterile neutrino dark matter from a dark sector
• New physics decaying into metastable particles: impact on cosmic neutrinos
• How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach
• Unveiling Neutrino Halos with CMB Lensing
• Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
• Inference of neutrino nature and Majorana CP phases from $0\nu \beta \beta$ decays with inverted mass ordering
• Scale and redshift dependent limits on cosmic neutrino properties
• Probing sterile neutrino dark matter in the PTOLEMY-like experiment
• Updated neutrino mass constraints from galaxy clustering and CMB lensing-galaxy cross-correlation measurements
• A self-consistent wave description of axion miniclusters and their survival in the galaxy