Dark Sound

The Axion is a candidate particle for dark matter in our universe, and it is currently a pressing topic to develop new detection methods for this particle. Owing to its high occupancy number, the Axion can display properties of a Bose-Einstein condensate. In particular, self-interactions and gravity produce a sound mode (``Dark Sound") in the system, whose dynamics allows us to probe with new frequency regimes at detectors. We present our analysis and numerical estimates of detection parameters.