Gravitational clustering of relic neutrinos and implications for their detection

Details Gravitational clustering of relic neutrinos and implications for their detection Gravitational clustering of relic neutrinos and implications for their detection

2004-08-23

arxiv.org/abs/hep-ph/0408241v2

JCAP 0412 (2004) 005

Physics

High Energy Physics

High Energy Physics - Phenomenology

38 pages, 8 embedded figures, iopart.cls; v2: references added, minor changes in text, to appear in JCAP

Scientific paper

10.1088/1475-7516/2004/12/005

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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