Constraining the Milky Way potential with Double White Dwarfs
  The upcoming LISA mission is the only experiment that will allow us to study
the Milky Way's structure using gravitational wave signals from Galactic double
white dwarfs (DWDs). The total number of expected detections exceeds $10^5$.
Furthermore, up to a hundred DWDs can be simultaneously detected in both
gravitational and optical radiation (e.g. with Gaia and LSST as eclipsing),
making DWDs ideal sources for performing a multi-messenger tomography of the
Galaxy. We show that LISA will detect DWDs everywhere, mapping also the
opposite side of the Galaxy. This complete coverage will: (1) provide precise
and unbiased constraints on the scale radii of the Milky Way's bulge and disc,
and (2) allow us to compute the rotation curve and derive competitive estimates
for the bulge and disc masses, when combining gravitational wave and optical
observations.
