Enhancing Constraints on Ultralight Axion Dark Matter from Gravitational Capture
Ultralight axions can be gravitationally captured by massive bodies like the Sun, creating solar-bound states that exponentially amplify local dark matter density through Bose enhancement. This effect leads to a significant increase in the local DM overdensity, which strengthens experimental constraints on axion-photon coupling and could improve sensitivity by an order of magnitude in specific mass ranges.