Search Publications
Towards a more rigorous treatment of uncertainties on the velocity distribution of dark matter particles for capture in stars
Lopes, Ilídio; Lacroix, Thomas; Lopes, José
Dark matter (DM) capture in stars offers a rich phenomenology that makes it possible to probe a wide variety of particle DM scenarios in diverse astrophysical environments. In spite of decades of improvements to refine predictions of capture-related observables and better quantify astrophysical and particle-physics uncertainties, the actual impact…
Nonthermal element abundances at astrophysical shocks
Eichmann, Björn; Rachen, Jörg P.
The nonthermal source abundances of elements play a crucial role in the understanding of cosmic ray phenomena from a few GeV up to several tens of EeV . We present a first systematic approach to describe the change of the abundances from the thermal to the nonthermal state via diffusive shock acceleration by a temporally evolving shock. We conside…
Testing the predictions of axisymmetric distribution functions of galactic dark matter with hydrodynamical simulations
Lavalle, Julien; Petač, Mihael; Núñez-Castiñeyra, Arturo +1 more
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 …
Dynamical friction in a Fuzzy Dark Matter universe
Spergel, David N.; Lisanti, Mariangela; Lancaster, Lachlan +3 more
We present an in-depth exploration of the phenomenon of dynamical friction in a universe where the dark matter is composed entirely of so-called Fuzzy Dark Matter (FDM), ultralight bosons of mass m~Script O(10-22) eV . We review the classical treatment of dynamical friction before presenting analytic results in the case of FDM for point…
unWISE tomography of Planck CMB lensing
Ferraro, Simone; Schlafly, Edward F.; White, Martin +1 more
CMB lensing tomography, or the cross-correlation between CMB lensing maps and large-scale structure tracers over a well-defined redshift range, has the potential to map the amplitude and growth of structure over cosmic time, provide some of the most stringent tests of gravity, and break important degeneracies between cosmological parameters. In th…
A robust estimate of the Milky Way mass from rotation curve data
Karukes, E. V.; Benito, M.; Iocco, F. +2 more
We present a new estimate of the mass of the Milky Way, inferred via a Bayesian approach by making use of tracers of the circular velocity in the disk plane and stars in the stellar halo, as from the publicly available galkin compilation. We use the rotation curve method to determine the dark matter distribution and total mass under different assu…
Neutrino clustering in the Milky Way and beyond
Lesgourgues, J.; de Salas, P. F.; Gariazzo, S. +3 more
The standard cosmological model predicts the existence of a Cosmic Neutrino Background, which has not yet been observed directly. Some experiments aiming at its detection are currently under development, despite the tiny kinetic energy of the cosmological relic neutrinos, which makes this task incredibly challenging. Since massive neutrinos are at…
The dark matter component of the Gaia radially anisotropic substructure
Grand, Robert J. J.; Gómez, Facundo A.; Fattahi, Azadeh +5 more
We study the properties of the dark matter component of the radially anisotropic stellar population recently identified in the Gaia data, using magneto-hydrodynamical simulations of Milky Way-like halos from the Auriga project. We identify 10 simulated galaxies that approximately match the rotation curve and stellar mass of the Milky Way. Four of …
Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars
Neronov, A.; Semikoz, D.; Korochkin, A.
Decaying axion-like particles (ALP) with masses in the eV range which might occupy dark matter halos of the Milky Way and other galaxies produce a characteristic "bump" feature in the spectrum of extragalactic background light (EBL). This feature leaves an imprint on the gamma-ray spectra of distant extragalactic sources. We derive constraints on …
Measurement of the B-band galaxy Luminosity Function with Approximate Bayesian Computation
Tortorelli, Luca; Herbel, Jörg; Amara, Adam +3 more
The galaxy Luminosity Function (LF) is a key observable for galaxy formation, evolution studies and for cosmology. In this work, we propose a novel technique to forward model wide-field broad-band galaxy surveys using the fast image simulator UFig and measure the LF of galaxies in the B-band. We use Approximate Bayesian Computation (ABC) to constr…