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Gravitational clustering of relic neutrinos and implications for their detection

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arxiv hep-ph/0408241 v2 pith:OKAGE4U6 submitted 2004-08-23 hep-ph astro-phhep-ex

Andreas Ringwald , Yvonne Y. Y. Wong This is my paper · ORCID
classification hep-phastro-phhep-ex
keywords clusteringdetectionneutrinosneutrinorelicgravitationaltechniquecosmic
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abstract

We study the gravitational clustering of big bang relic neutrinos onto existing cold dark matter (CDM) and baryonic structures within the flat $\Lambda$CDM model, using both numerical simulations and a semi-analytical linear technique, with the aim of understanding the neutrinos' clustering properties for direct detection purposes. In a comparative analysis, we find that the linear technique systematically underestimates the amount of clustering for a wide range of CDM halo and neutrino masses. This invalidates earlier claims of the technique's applicability. We then compute the exact phase space distribution of relic neutrinos in our neighbourhood at Earth, and estimate the large scale neutrino density contrasts within the local Greisen--Zatsepin--Kuzmin zone. With these findings, we discuss the implications of gravitational neutrino clustering for scattering-based detection methods, ranging from flux detection via Cavendish-type torsion balances, to target detection using accelerator beams and cosmic rays. For emission spectroscopy via resonant annihilation of extremely energetic cosmic neutrinos on the relic neutrino background, we give new estimates for the expected enhancement in the event rates in the direction of the Virgo cluster.

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Forward citations

Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Heavy neutral leptons beyond the BBN bound: probing the lepton asymmetry of the Universe

    hep-ph 2026-08 conditional novelty 8.0 of 10

    A Dirac heavy neutral lepton with a particle-antiparticle asymmetry can evade the hadronic BBN bound by injecting charged pions that restore the standard neutron abundance, opening sub-GeV parameter space accessible to SHiP.

  2. Pathways and impediments towards a detection of the relic neutrino wind

    hep-ph 2026-07 accept novelty 6.0 of 10

    Detecting the cosmic neutrino background's dipole anisotropy via tritium capture requires ~10^5 times the exposure needed for flux detection, with Majorana neutrinos suffering an additional (m_ν/T_ν)^2 suppression.

  3. The Cosmic Neutrino Background is within Reach of Future Neutrino Telescopes

    hep-ph 2026-01 conditional novelty 6.0 of 10

    Including deep-inelastic scattering makes cosmic-ray-boosted relic neutrinos bright enough for IceCube to bound the CνB overdensity to ~100–1000, and future networks could reach the ΛCDM value.

  4. Indirect Detection of Hot Dark Matter

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Using two clustering mechanisms, concurrent collapse and gravitational clustering, the authors derive hot dark matter density profiles and recast CDM telescope bounds into axion-photon coupling limits for 1 to 10 eV axions.

  5. Neutrino-Induced Polarization Rotation in Active Galactic Nuclei Plasmas

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Neutrino-induced polarization rotation in AGN plasmas is computed and found to produce a frequency scaling distinct from Faraday rotation, but with angles far below current polarimetric sensitivity.

  6. Probing Terrestrial Relic Neutrino Charge with Mach-Zehnder Interferometer

    hep-ph 2025-06 reject novelty 5.0 of 10

    A Mach-Zehnder interferometer with one vertical arm is proposed to probe relic neutrino charge, with claimed sensitivity down to epsilon_nu ~ 10^-22, but the signal calculation is flawed.

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