Nathan Musoke

Abstract As constraints on ultralight axionlike particles (ALPs) tighten, models with multiple species of ultralight ALP are of increasing interest. We perform simulations of two-ALP models with particles in the currently supported range of plausible masses. The code we modified, ultradark.jl, not only allows for multiple species of ultralight ALP with different masses, but also different self-interactions and interfield interactions.

Abstract Ultralight axions (ULAs) are promising dark matter candidates that can have a distinct impact on the formation and evolution of structure on nonlinear scales relative to the cold, collisionless dark matter (CDM) paradigm. However, most studies of structure formation in ULA models do not include the effects of self-interactions, which are expected to arise generically. Here, we study how the tidal evolution of solitons is affected by ULA self-interaction strength and sign.