The Cosmic Neutrino Background anisotropy — linear theory

Hannestad, Steen; Brandbyge, Jacob

doi:10.1088/1475-7516/2010/03/020

Cited by 17 publications

(21 citation statements)

References 57 publications

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“…[3] and resolves one of the main disagreements between Refs. [4] and [3]. The amplification of CνB angular power spectrum at low multipoles is shown in Fig.…”

Section: Cνb Anisotropy Calculationssupporting

confidence: 66%

Multi-Messenger Astrophysics with the Cosmic Neutrino Background

Tully,

Zhang

2021

Preprint

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The massive neutrinos of the Cosmic Neutrino Background (CνB) are fundamental ingredients of the radiation-dominated early universe and are important non-relativistic probes of the large-scale structure formation in the late universe. The dominant source of anisotropies in the neutrino flux distribution on the sky are highly amplified integrals of metric perturbations encountered during the non-relativistic phase of the CνB. This paper numerically compares the line-of-sight methods for computing CνB anisotropies with the Einstein-Boltzmann hierarchy solutions in linear theory for a range of neutrino masses. Angular power spectra are computed that are relevant to a future polarized tritium target run of the PTOLEMY experiment. Correlations between the CνB sky maps and galactic survey data are derived using line-of-sight techniques and discussed in the context of multi-messenger astrophysics.

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“…[3] and resolves one of the main disagreements between Refs. [4] and [3]. The amplification of CνB angular power spectrum at low multipoles is shown in Fig.…”

Section: Cνb Anisotropy Calculationssupporting

confidence: 66%

Multi-Messenger Astrophysics with the Cosmic Neutrino Background

Tully,

Zhang

2021

Preprint

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“…All energy components of the ΛCDM model except for dark energy (i.e., photons, neutrinos, baryons and cold dark matter), have inhomogeneities, making them potentially useful sources of information about the initial fluctuations. Out of these, we can exclude the perturbations of the neutrino background: while in principle a good probe of the primordial power spectrum [316], cosmic background neutrinos are elusive creatures and although their direct detection may be within reach with current technology [317][318][319], a detection of their anisotropies is unlikely in the foreseeable future. This leaves us with photon and matter perturbations.…”

Section: Observables: Measuring Spatial Fluctuationsmentioning

confidence: 99%

Features and new physical scales in primordial observables: Theory and observation

Chluba

Hamann

Patil

2015

Int. J. Mod. Phys. D

212

233

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June 22, 20152 All cosmological observations to date are consistent with adiabatic, Gaussian and nearly scale invariant initial conditions. These findings provide strong evidence for a particular symmetry breaking pattern in the very early universe (with a close to vanishing order parameter, ), widely accepted as conforming to the predictions of the simplest realizations of the inflationary paradigm. However, given that our observations are only privy to perturbations, in inferring something about the background that gave rise to them, it should be clear that many different underlying constructions project onto the same set of cosmological observables. Features in the primordial correlation functions, if present, would offer a unique and discriminating window onto the parent theory in which the mechanism that generated the initial conditions is embedded. In certain contexts, simple linear response theory allows us to infer new characteristic scales from the presence of features that can break the aforementioned degeneracies among different background models, and in some cases can even offer a limited spectroscopy of the heavier degrees of freedom that couple to the inflaton. In this review, we offer a pedagogical survey of the diverse, theoretically well grounded mechanisms which can imprint features into primordial correlation functions in addition to reviewing the techniques one can employ to probe observations. These observations include cosmic microwave background anisotropies and spectral distortions as well as the matter two and three point functions as inferred from large-scale structure and potentially, 21 cm surveys.

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“…Interestingly, for massive particles the cosmic background anisotropy becomes markedly different from the massless case. This was studied in [74] for the case of light neutrinos. For neutrinos with average thermal velocity larger than v ∼ 1000 km/s, very few neutrinos are bound, even in massive halos.…”

Section: Anisotropies In the Cosmic Neutrino Backgroundmentioning

confidence: 99%

Neutrino physics from precision cosmology

Hannestad

2010

Progress in Particle and Nuclear Physics

Self Cite

100

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Cosmology provides an excellent laboratory for testing various aspects of neutrino physics. Here, I review the current status of cosmological searches for neutrino mass, as well as other properties of neutrinos. Future cosmological probes of neutrino properties are also discussed in detail.Comment: 30 pages, 10 figures, Review article for Progress in Particle and Nuclear Physics, references update

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The Cosmic Neutrino Background anisotropy — linear theory

Cited by 17 publications

References 57 publications

Multi-Messenger Astrophysics with the Cosmic Neutrino Background

Multi-Messenger Astrophysics with the Cosmic Neutrino Background

Features and new physical scales in primordial observables: Theory and observation

Neutrino physics from precision cosmology

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