Search Publications
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…
Gamma-ray signals from multicomponent scalar dark matter decays
Ibarra, Alejandro; Ghosh, Avirup; Mondal, Tanmoy +1 more
Within a multicomponent dark matter scenario, novel gamma-ray signals may arise from the decay of the heavier dark matter component into the lighter. For a scalar dark sector of this kind, the decay phi2→phi1 γ is forbidden by the conservation of angular momentum, but the decay phi2 → phi1 γγ can have a …
Probing multicomponent FIMP scenarios with gamma-ray telescopes
Ibarra, Alejandro; Herms, Johannes
We consider a scenario where the dark sector includes two Feebly Interacting Massive Particles (FIMPs), with couplings to the Standard Model particles that allow their production in the Early Universe via thermal freeze-in. These couplings generically lead to the decay of the heavier dark matter component into the lighter, possibly leading to obse…
On the estimation of the local dark matter density using the rotation curve of the Milky Way
de Salas, P. F.; Malhan, K.; Freese, K. +2 more
The rotation curve of the Milky Way is commonly used to estimate the local dark matter density ρDM,solar. However, the estimates are subject to the choice of the distribution of baryons needed in this type of studies. In this work we explore several Galactic mass models that differ in the distribution of baryons and dark matter, in order to determ…
Using Gaia DR2 to constrain local dark matter density and thin dark disk
Buch, Jatan; Leung, John Shing Chau; Fan, JiJi
We use stellar kinematics from the latest Gaia data release (DR2) to measure the local dark matter (DM) density ρDM in a heliocentric cylinder of radius R= 150 pc and half-height z= 200 pc. We also explore the prospect of using our analysis to estimate the DM density in local substructure by setting constraints on the surface density an…
Structure formation and exotic compact objects in a dissipative dark sector
Chang, Jae Hyeok; Egana-Ugrinovic, Daniel; Essig, Rouven +1 more
We present the complete history of structure formation in a simple dissipative dark-sector model. The model has only two particles: a dark electron, which is a subdominant component of dark matter, and a dark photon. Dark-electron perturbations grow from primordial overdensities, become non-linear, and form dense dark galaxies. Bremsstrahlung cool…
The local and distant Universe: stellar ages and H0
Verde, Licia; Jimenez, Raul; Cimatti, Andrea +2 more
The ages of the oldest stellar objects in our galaxy provide an independent test of the current cosmological model as they give a lower limit to the age of the Universe. Recent accurate parallaxes by the Gaia space mission, accurate measurements of the metallicity of stars, via individual elemental abundances, and advances in the modelling of stel…
Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
Ciucă, Ioana; Kawata, Daisuke; Domínguez, Alberto +5 more
Fermi-LAT unidentified sources (unIDs) have proven to be compelling targets for performing indirect dark matter (DM) searches. In a previous work, we found that among the 1235 unIDs in Fermi-LAT's catalogs (3FGL, 2FHL and 3FHL) only 44 of those are DM subhalos candidates. We now implement a spectral analysis to test whether these remaining sources…