July 29, 2019 to August 2, 2019
Northeastern University
US/Eastern timezone

Forecasting dark matter searches at next-generation direct detection experiments in light of astrophysical uncertainties: Method

Aug 1, 2019, 5:08 PM
17m
West Village G 102 (Northeastern University)

West Village G 102

Northeastern University

Oral Presentation Dark Matter Dark Matter

Speaker

Jatan Buch (Brown University)

Description

Analyses of the latest Gaia data release (DR2) by various groups have revealed that the dark matter (DM) halo around the solar neighborhood is in disequilibrium, and an O(1) fraction of the DM may have been accreted during recent dwarf galaxy mergers. These results indicate a departure from the Standard Halo Model (SHM) of DM velocity distribution, which could significantly affect DM signals at direct detection experiments. In this talk, we parametrize the local DM velocity distribution through a model with three distinct components: an isotropic halo, an anisotropic substructure component (the so-called Gaia Sausage), and a coherent stream of DM associated with the S1 stellar stream. We illustrate the effect of astrophysical uncertainties on discriminating signals from various DM models using the novel framework of information geometry. In particular, we review the Euclideanized signal method introduced by Edwards & Weniger that allows us to rapidly scan over a large-dimensional parameter space without resorting to computationally expensive Monte Carlo simulations that rely on a finite number of arbitrary benchmark points.

Primary author

Jatan Buch (Brown University)

Co-authors

Shing Chau Leung (Brown University) JiJi Fan (Brown University)

Presentation materials