Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Tully, C.; Zhang, Gemma

doi:10.3390/universe8020118

Cited by 3 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure 8, we plot the averaged ∆j/j z for only 200 compact and 200 scarce halos in each selected cube, and handle them as what we do in Figure 7. The mean ∆j/j z of compact and scarce cells in dense cubes are −0.0077 (17) and −0.0056 (11), while for the two groups in sparse cubes they are −0.0051 (16) and −0.0042 (13). The error bars in the dense cube are more exclusive and distinct.…”

Section: Discussionmentioning

confidence: 95%

“…In Figure 7, we plot the averaged ∆j/j z (the variation of mass-reduce angular momentum modulus, and j = J/ M, M is the CDM-particle group number of each halo, namely the mass divided by its mass resolution) for all halos in each selected cube, and present the mean and stand deviation of all averaged ∆j/j z . The mean ∆j/j z of dense cubes is −0.0067 (11), while for sparse cubes it is −0.0053 (13). Although their error bars do not touch the other mean values, they overlap with the other bar in most areas.…”

Section: Discussionmentioning

confidence: 99%

“…They emerged soon after the Big Bang. Cosmologists constrain the mass hierarchy of neutrinos by observing their effects on the Cosmic Neutrino Background (CNB) [10,11], Cosmic Microwave Background (CMB) [12,13], and Large-Scale Structure (LSS) [14,15]. Many recent works investigate these effects, including haloscope experiments for detecting Cold Dark Matter (CDM) candidates (such as axions and dark photons) [16,17], measurements of absolute neutrino mass in [18] and DUNE [19] experiments, and constraints on the CDM parameter(s) [20,21].…”

Section: Introduction 1neutrinosmentioning

confidence: 99%

See 2 more Smart Citations

Cosmological Neutrino N-Body Simulations of Dark Matter Halo

et al. 2023

Universe

View full text Add to dashboard Cite

The study of massive neutrinos and their interactions is a critical aspect of contemporary cosmology. Recent advances in parallel computation and high-performance computing provide new opportunities for accurately constraining Large-Scale Structures (LSS). In this paper, we introduce the TianNu cosmological N-body simulation during the co-evolution of massive neutrino and cold dark matter components via the CUBEP3M code running on the supercomputer Tianhe-2 and TianNu’s connected works. We start by analyzing 2.537×107 dark halos from the scientific data of TianNu simulation, and compare their angular momentum with the matched halos from neutrino-free TianZero, revealing a dependence of angular momentum modulus on neutrino injection at scales below 50 Mpc and around 10 Mpc.

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introduction 1neutrinosmentioning

confidence: 99%

See 1 more Smart Citation

Cosmological Neutrino N-Body Simulations of Dark Matter Halo

et al. 2023

Universe

View full text Add to dashboard Cite

show abstract

“…The concept of neutrino capture on 𝛽-decay nuclei as a detection method for the C𝜈B was laid out in the original paper by Steven Weinberg [1] in 1962 and revisited by Cocco, Mangano and Messina [2] in 2007 to include finite neutrino masses discovered by oscillation experiments, with tritium identified as the most promising target candidate. Further investigations on the target physics are underway [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Implementation and optimization of the PTOLEMY transverse drift electromagnetic filter

Apponi¹,

Betti²,

Borghesi³

et al. 2022

J. Inst.

View full text Add to dashboard Cite

The PTOLEMY transverse drift filter is a new concept to enable precision analysis of the energy spectrum of electrons near the tritium β-decay endpoint. This paper details the implementation and optimization methods for successful operation of the filter for electrons with a known pitch angle. We present the first demonstrator that produces the required magnetic field properties with an iron return-flux magnet. Two methods for the setting of filter electrode voltages are detailed. The challenges of low-energy electron transport in cases of low field are discussed, such as the growth of the cyclotron radius with decreasing magnetic field, which puts a ceiling on filter performance relative to fixed filter dimensions. Additionally, low pitch angle trajectories are dominated by motion parallel to the magnetic field lines and introduce non-adiabatic conditions and curvature drift. To minimize these effects and maximize electron acceptance into the filter, we present a three-potential-well design to simultaneously drain the parallel and transverse kinetic energies throughout the length of the filter. These optimizations are shown, in simulation, to achieve low-energy electron transport from a 1 T iron core (or 3 T superconducting) starting field with initial kinetic energy of 18.6 keV drained to < 10 eV (< 1 eV) in about 80 cm. This result for low field operation paves the way for the first demonstrator of the PTOLEMY spectrometer for measurement of electrons near the tritium endpoint to be constructed at the Gran Sasso National Laboratory (LNGS) in Italy.

show abstract

Influence of local structure on relic neutrino abundances and anisotropies

Zimmer,

Correa,

Ando

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Gravitational potentials of the Milky Way and extragalactic structures can influence the propagation of the cosmic neutrino background (CNB). Of particular interest to future CNB observatories, such as PTOLEMY, is the CNB number density on Earth. In this study, we have developed a simulation framework that maps the trajectories of relic neutrinos as they move through the local gravitational environment. The potentials are based on the dark matter halos found in state-of-the-art cosmological N-body simulations, resulting in a more nuanced and realistic input than the previously employed analytical models. We find that the complex dark matter distributions, along with their dynamic evolution, influence the abundance and anisotropies of the CNB in ways unaccounted for by earlier analytical methods. Importantly, these cosmological simulations contain multiple instances of Milky Way-like halos that we employ to model a variety of gravitational landscapes. Consequently, we notice a variation in the CNB number densities that can be primarily attributed to the differences in the masses of these individual halos. For neutrino masses between 0.01 and 0.3 eV, we note clustering factors within the range of 1 + 𝒪(10-3) to 1 + 𝒪(1). Furthermore, the asymmetric nature of the underlying dark matter distributions within the halos results in not only overdense, but intriguingly, underdense regions within the full-sky anisotropy maps. Gravitational clustering appears to have a significant impact on the angular power spectra of these maps, leading to orders of magnitude more power on smaller scales beyond multipoles of ℓ = 3 when juxtaposed against predictions by primordial fluctuations. We discuss how our results reshape our understanding of relic neutrino clustering and how this might affect observability of future CNB observatories such as PTOLEMY.GitHub: our simulation code will be made visiblehere.

show abstract

Impact of Warm Dark Matter on the Cosmic Neutrino Background Anisotropies

Cited by 3 publications

References 19 publications

Cosmological Neutrino N-Body Simulations of Dark Matter Halo

Cosmological Neutrino N-Body Simulations of Dark Matter Halo

Implementation and optimization of the PTOLEMY transverse drift electromagnetic filter

Influence of local structure on relic neutrino abundances and anisotropies

Contact Info

Product

Resources

About