CE31 - Physique Subatomique, Sciences de l'Univers, Structure et Histoire de la Terre

Galactic Dark Matter – GaDaMa

Submission summary

The lambda cold dark matter (LCDM) scenario implies the structuring of DM on subgalactic scales. This may lead to tensions with observational constraints known as the core-cusp and subhalo problems, while this could also help discover or exclude DM particle candidates. The Milky Way (MW) is a perfect laboratory to study these issues, as some stellar surveys are probing its dynamics to unprecedented accuracy and as many DM search experiments are currently running. This project brings together an interdisciplinary task force to develop semi-analytic methods so as to feature and constrain the MW DM distribution in phase space with extensive tests against numerical simulations, with the goal of making an extensive an self-consistent interpretation of novel data from the Gaia satellite (second data release - DR2 - expected in April 2018). These unprecedented high-precision data are expected to be game changing in the current understanding of the DM distribution in the MW. We will also study the impact of the DM graininess, including effects on stellar streams. We will then revise the predictions for DM searches with reduced theoretical errors (multimessenger astronomy, direct searches, gravitational searches, etc.), and eventually explore alternatives to CDM.

Project coordination

Julien Lavalle (Laboratoire Univers et Particules de Montpellier)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


ObAS Observatoire astronomique de Strasbourg
L2C Laboratoire Charles Coulomb
LUPM Laboratoire Univers et Particules de Montpellier
LAM Laboratoire d'astrophysique de Marseille

Help of the ANR 420,076 euros
Beginning and duration of the scientific project: October 2018 - 48 Months

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