Search Publications
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 …
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…
Predicting the dark matter velocity distribution in galactic structures: tests against hydrodynamic cosmological simulations
Lacroix, Thomas; Stref, Martin; Lavalle, Julien +2 more
Reducing theoretical uncertainties in Galactic dark matter (DM) searches is an important challenge as several experiments are now delving into the parameter space relevant to popular (particle or not) candidates. Since many DM signal predictions rely on the knowledge of the DM velocity distribution—direct searches, capture by stars, p-wave-suppres…
Informing dark matter direct detection limits with the ARTEMIS simulations
McCarthy, Ian G.; Font, Andreea S.; Poole-McKenzie, Robert +4 more
Dark matter (DM) direct detection experiments aim to place constraints on the DM-nucleon scattering cross-section and the DM particle mass. These constraints depend sensitively on the assumed local DM density and velocity distribution function. While astrophysical observations can inform the former (in a model-dependent way), the latter is not dir…
Spectro-imaging forward model of red and blue galaxies
Tortorelli, Luca; Herbel, Jörg; Amara, Adam +3 more
For the next generation of spectroscopic galaxy surveys, it is important to forecast their performances and to accurately interpret their large data sets. For this purpose, it is necessary to consistently simulate different populations of galaxies, in particular Emission Line Galaxies (ELGs), less used in the past for cosmological purposes. In thi…