Repozitorij Univerze v Novi Gorici

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Naslov:Testing the predictions of axisymmetric distribution functions of galactic dark matter with hydrodynamical simulations
Avtorji:Petač, Mihael (Avtor)
Lavalle, Julien (Avtor)
Núñez-Castiñeyra, Arturo (Avtor)
Nezri, Emmanuel (Avtor)
Datoteke:URL https://iopscience.iop.org/article/10.1088/1475-7516/2021/08/031
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Signal predictions for galactic dark matter (DM) searches often rely on assumptions regarding the DM phase-space distribution function (DF) in halos. This applies to both particle (e.g. p-wave suppressed or Sommerfeld-enhanced annihilation, scattering off atoms, etc.) and macroscopic DM candidates (e.g. microlensing of primordial black holes). As experiments and observations improve in precision, better assessing theoretical uncertainties becomes pressing in the prospect of deriving reliable constraints on DM candidates or trustworthy hints for detection. Most reliable predictions of DFs in halos are based on solving the steady-state collisionless Boltzmann equation (e.g. Eddington-like inversions, action-angle methods, etc.) consistently with observational constraints. One can do so starting from maximal symmetries and a minimal set of degrees of freedom, and then increasing complexity. Key issues are then whether adding complexity, which is computationally costy, improves predictions, and if so where to stop. Clues can be obtained by making predictions for zoomed-in hydrodynamical cosmological simulations in which one can access the true (coarse-grained) phase-space information. Here, we test an axisymmetric extension of the Eddington inversion to predict the full DM DF from its density profile and the total gravitational potential of the system. This permits to go beyond spherical symmetry, and is a priori well suited for spiral galaxies. We show that axisymmetry does not necessarily improve over spherical symmetry because the (observationally unconstrained) angular momentum of the DM halo is not generically aligned with the baryonic one. Theoretical errors are similar to those of the Eddington inversion though, at the 10-20% level for velocity-dependent predictions related to particle DM searches in spiral galaxies. We extensively describe the approach and comment on the results.
Ključne besede:galaxy dynamics, dark matter experiments, dark matter simulations, dark matter theory, cosmology, nongalactic astrophysics, astrophysics of galaxies, high energy physics
Leto izida:2021
Št. strani:str. 1-50
Številčenje:no. 8, Vol. 2021
COBISS_ID:78771459 Povezava se odpre v novem oknu
UDK:52
ISSN pri članku:1475-7516
URN:URN:SI:UNG:REP:H1DBIDG6
DOI:10.1088/1475-7516/2021/08/031 Povezava se odpre v novem oknu
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Gradivo je del revije

Naslov:Journal of cosmology and astroparticle physics
Založnik:Institute of Physics Pub.
ISSN:1475-7516
COBISS.SI-ID:389627 Novo okno

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