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Annual modulation of cosmic relic neutrinos

Author(s): Safdi, Benjamin R; Lisanti, Mariangela; Spitz, Joshua; Formaggio, Joseph A

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Abstract: The cosmic neutrino background (C nu B), produced about one second after the big bang, permeates the Universe today. New technological advancements make neutrino capture on beta-decaying nuclei (NCB) a clear path forward towards the detection of the C nu B. We show that gravitational focusing by the Sun causes the expected neutrino capture rate to modulate annually. The amplitude and phase of the modulation depend on the phase-space distribution of the local neutrino background, which is perturbed by structure formation. These results also apply to searches for sterile neutrinos at NCB experiments. Gravitational focusing is the only source of modulation for neutrino capture experiments, in contrast to dark-matter direct-detection searches where the Earth’s time-dependent velocity relative to the Sun also plays a role.
Publication Date: 15-Aug-2014
Electronic Publication Date: 1-Aug-2014
Citation: Safdi, Benjamin R, Lisanti, Mariangela, Spitz, Joshua, Formaggio, Joseph A. (2014). Annual modulation of cosmic relic neutrinos. PHYSICAL REVIEW D, 90 (10.1103/PhysRevD.90.043001
DOI: doi:10.1103/PhysRevD.90.043001
ISSN: 2470-0010
EISSN: 2470-0029
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW D
Version: Final published version. This is an open access article.

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