Equilibrium axisymmetric halo model for the Milky Way and its implications for direct and indirect dark matter searches
| Autor: | Mihael Petač |
|---|---|
| Přispěvatelé: | Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Milky Way
Dark matter FOS: Physical sciences Astrophysics dark matter: density 01 natural sciences Bayesian flux: time dependence symmetry: axial anisotropy: velocity High Energy Physics - Experiment dark matter: coupling High Energy Physics - Experiment (hep-ex) phase space High Energy Physics - Phenomenology (hep-ph) near detector 0103 physical sciences conservation law [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Sensitivity (control systems) 010306 general physics halo: rotation Physics 010308 nuclear & particles physics dark matter: mass Galactic Center scattering: operator Relative velocity Coupling (probability) sensitivity Astrophysics - Astrophysics of Galaxies Baryon High Energy Physics - Phenomenology modulation halo: model annihilation dark matter: heavy kinematics Astrophysics of Galaxies (astro-ph.GA) [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] direct detection Halo dark matter: velocity galaxy velocity dependence numerical calculations: Monte Carlo [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics and astroparticle physics |
| Zdroj: | Physical Review D Physical Review D, American Physical Society, 2020, 102 (12), pp.123028. ⟨10.1103/PhysRevD.102.123028⟩ |
| ISSN: | 1550-7998 1550-2368 |
| DOI: | 10.1103/PhysRevD.102.123028⟩ |
| Popis: | We for the first time provide self-consistent axisymmetric phase-space distribution models for the Milky Way's dark matter (DM) halo which are carefully matched against the latest kinematic measurements through Bayesian analysis. By using broad priors on the individual galactic components, we derive conservative estimates for the astrophysical factors entering the interpretation of direct and indirect DM searches. While the resulting DM density profiles are in good agreement with previous studies, implying $\rho_\odot \approx 10^{-2} \, M_\odot / \mathrm{pc}^3$, the presence of baryonic disc leads to significant differences in the local DM velocity distribution in comparison with the standard halo model. For direct detection, this implies roughly 30% stronger cross-section limits at DM masses near detectors maximum sensitivity and up to an order of magnitude weaker limits at the lower end of the mass range. Furthermore, by performing Monte-Carlo simulations for the upcoming DARWIN and DarkSide-20k experiments, we demonstrate that upon successful detection of heavy DM with coupling just below the current limits, the carefully constructed axisymmetric models can eliminate bias and reduce uncertainties by more then 50% in the reconstructed DM coupling and mass, but also help in a more reliable determination of the scattering operator. Furthermore, the velocity anisotropies induced by the baryonic disc can lead to significantly larger annual modulation amplitude and sizable differences in the directional distribution of the expected DM-induced events. For indirect searches, we provide the differential $J$-factors and compute several moments of the relative velocity distribution that are needed for predicting the rate of velocity-dependent annihilations. However, we find that accurate predictions are still hindered by large uncertainties regarding the DM distribution near the galactic center. Comment: Article consists of 44 pages, 15 figures. We additionally provide the tabulated values of astrophysical factors (in total 18 files) obtained in this work |
| Databáze: | OpenAIRE |
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