Search Publications
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…
Uncertainties in direct dark matter detection in light of Gaia's escape velocity measurements
Valluri, Monica; Freese, Katherine; Wu, Youjia +2 more
Direct detection experiments have set increasingly stringent limits on the cross section for spin-independent dark matter-nucleon interactions. In obtaining such limits, experiments primarily assume the standard halo model (SHM) as the distribution of dark matter in our Milky Way. Three astrophysical parameters are required to define the SHM: the …
Detecting dark photon dark matter with Gaia-like astrometry observations
Yuan, Qiang; Zhao, Yue; Guo, Huai-Ke +3 more
A class of dark photon dark matter models with ultralight masses would lead to oscillation of a test body through a coupling with baryons or B-L charge. This periodical oscillation of an observer results in swing of a star's apparent position due to the effect of aberration of light, which could be probed with high-precision astrometry observation…
Impact of substructure on local dark matter searches
Ibarra, Alejandro; Kavanagh, Bradley J.; Rappelt, Andreas
Dark matter substructure can contribute significantly to local dark matter searches and may provide a large uncertainty in the interpretation of those experiments. For direct detection experiments, sub-halos give rise to an additional dark matter component on top of the smooth dark matter distribution of the host halo. In the case of dark matter c…
All-sky angular power spectra from cleaned WISE×SuperCOSMOS galaxy number counts
Balaguera-Antolínez, A.; Costa-Duarte, M. V.; Xavier, H. S. +1 more
Aiming to extract cosmological information from linear scales of the WISE×SuperCOSMOS photometric redshift catalog, we perform a characterization of the systematic effects associated with stellar content, evidencing the presence of contamination and obscuration. We create an integrated model for these effects (which together we call "usurper conta…
Resonant assisted annihilation
Nath Maity, Tarak; Sankar Ray, Tirtha
Assisted annihilation is a novel mechanism to generate viable sub-GeV thermal dark matter, where a pair of stable dark matter annihilates with an assister to Standard Model states. Typically such 3 → 2 annihilation topologies are flux suppressed compared to 2 → 2 processes. In this paper, we explore the possibility of a resonant 3 → 2 assisted ann…