Multi-messenger astrophysics with the cosmic neutrino background

Tully, C.; Zhang, Gemma

doi:10.1088/1475-7516/2021/06/053

Cited by 8 publications

(17 citation statements)

References 22 publications

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“…As described in Ref. [2], the CνB anisotropies for massive neutrinos grow rapidly during the non-relativistic phase of their motion. With directionality, as proposed by the PTOLEMY experiment with a polarized tritium target, the CνB neutrino capture rate variation provides a map of the anisotropies on the neutrino sky as seen on Earth.…”

Section: Introductionmentioning

confidence: 80%

“…The cosmic variance uncertainties impose a limitation on the expected fluctuations in C , but it may be possible to reduce these effects for the CνB using the multi-messenger approach described in Ref. [2]. By correlating CνB anisotropies to luminous tracers that track the matter power spectrum, cosmic variance can be replaced by data-derived predictions for the CνB anisotropies using optical data.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…The procedure was to generate a temperature map, as in Ref. [2], and to interpret the map as a count rate map for neutrino captures, without folding in the angular smearing from the polarized tritium target. The expected count per pixel on the sky is then smeared using Poisson statistics.…”

Section: Cνb Angular Power Spectramentioning

confidence: 99%

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Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Tully

Zhang

2022

Universe

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The Cosmic Neutrino Background (CνB) anisotropies for massive neutrinos are a unique probe of large-scale structure formation. The redshift-distance measure is completely different for massive neutrinos as compared to electromagnetic radiation. The CνB anisotropies in massive neutrinos grow in response to non-relativistic motion in gravitational potentials seeded by relatively high k-modes. Differences in the early phases of large-scale structure formation in warm dark matter (WDM) versus cold dark matter (CDM) cosmologies have an impact on the magnitude of the CνB anisotropies for contributions to the angular power spectrum that peak at high k-modes. We take the examples of WDM consisting of 2, 3, or 7 keV sterile neutrinos and show that the CνB anisotropies for 0.05 eV neutrinos drop off at high-l multipole moment in the angular power spectrum relative to CDM. At the same angular scales that one can observe baryonic acoustical oscillations in the CMB, the CνB anisotropies begin to become sensitive to differences in WDM and CDM cosmologies. The precision measurement of high-l multipoles in the CνB neutrino sky map is a potential possibility for the PTOLEMY experiment with thin film targets of spin-polarized atomic tritium superfluid that exhibit significant quantum liquid amplification for non-relativistic relic neutrino capture.

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Section: Introductionmentioning

confidence: 80%

Section: Results and Conclusionmentioning

confidence: 99%

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Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Tully

Zhang

2022

Universe

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“…The multi-messenger approach described in Ref. [2] to correlating CνB anisotropies to luminous tracers that track the matter power spectrum is relevant to testing models of warm dark matter. The CνB massive neutrinos due to their finite velocities probe relatively high redshift matter power spectra in advance of the largest non-linear contributions.…”

Section: Results and Conclusionmentioning

confidence: 99%

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Tully¹,

Zhang²

2022

Preprint

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The Cosmic Neutrino Background (CνB) anisotropies for massive neutrinos are a unique probe of large-scale structure formation. The redshift-distance measure is completely different for massive neutrinos as compared to electromagnetic radiation. The CνB anisotropies in massive neutrinos grow in response to non-relativistic motion in gravitational potentials seeded by relatively high k-modes. Differences in the early phases of large-scale structure formation in Warm Dark Matter (WDM) versus Cold Dark Matter (CDM) cosmologies have an impact on the magnitude of the CνB anisotropies for contributions to the angular power spectrum that peak at high k-modes. We take the example of WDM consisting of 2 keV sterile neutrinos and show that the CνB anisotropies for 0.05 eV neutrinos drop off at high-l multipole moment in the angular power spectrum relative to CDM. At the same angular scales that one can observe baryonic acoustical oscillations in the CMB, the CνB anisotropies begin to become sensitive to differences in WDM and CDM cosmologies. The precision measurement of high-l multipoles in the CνB neutrino sky map is a potential possibility for the PTOLEMY experiment with thin film targets of spin-polarized atomic tritium superfluid that exhibit significant quantum liquid amplification for non-relativistic relic neutrino capture.

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“…Till now there is no detail knowledge about the anisotropy of CνB, but even if the anisotropy is small before the neutrino becomes non-relativistic, the finite mass of neutrinos amplifies the anisotropy in the low multipole moments after the nonrelativistic transition. The anisotropies for a neutrino mass of 0.01 eV are amplified by more than 100 times compared to the massless case [55]. If we assume that the anisotropy of CνB takes a value 1 for estimation, the resulting strength of the gravitational wave memory due to CνB is about…”

mentioning

confidence: 96%

Gravitational wave memory produced by cosmic background radiation

Cao¹,

He²,

Zhao³

2022

Preprint

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It is well known that energy fluxes will produce gravitational wave memory. The gravitational wave memory produced by background including cosmic microwave background (CMB), cosmic neutrino background (CνB), and gravitational wave background is investigated in this work. We construct a theory relating the gravitational wave memory strength to the energy flux of a stochastic background. We find that the resulted gravitational wave memory behaves as a constantly varying metric tensor. Such a varying metric tensor will introduce a quadrupole structure to the universe expansion. The gravitational wave memory due to the CMB is too small to be detected. But the gravitational wave memory due to the CνB and the gravitational wave background is marginally detectable. Interestingly, such detection can be used to estimate the neutrino masses and the properties of the gravitational wave background.

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Multi-messenger astrophysics with the cosmic neutrino background

Cited by 8 publications

References 22 publications

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Gravitational wave memory produced by cosmic background radiation

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