Aspherical ULDM Collapse: Variation in the Core-Halo Mass Relation

Understand

Ultralight dark matter (ULDM) is an interesting alternative to the cold dark matter (CDM) paradigm.

• Due to the extremely low mass of the constituent particle ($\sim 10^{-22}$ eV), ULDM can exhibit quantum effects up to kiloparsec scales.
• In particular, runaway collapse in the centres of ULDM halos is prevented by quantum pressure, providing a possible resolution to the 'core-cusp problem' of CDM.
• However, the the detailed relationship between the ULDM core mass and that of the overall halo is poorly understood.