Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: Hoang Nhan Luu, Philip Mocz, Mark Vogelsberger, Simon May, Josh Borrow
| Summary:
Dark matter as scalar particles consisting of multiple species is well
motivated in string theory where axion fields are ubiquitous. A two-field fuzzy
dark matter (FDM) model features two species of ultralight axion particles with
different masses, $m_1 neq m_2$, which is extended from the standard one-field
model with $m_a sim 10^{-22},{rm eV}$. Here we perform numerical simulations
to explore the properties of two-field FDM haloes. We find that the central
soliton has a nested structure when $m_2 gg m_1$, which is distinguishable
from the generic flat-core soliton in one-field haloes. However, the formation
of this nested soliton is subject to many factors, including the density
fraction and mass ratio of the two fields. Finally, we study non-linear
structure formation in two-field cosmological simulations with self-consistent
initial conditions and find that the small-scale structure in two-field
cosmology is also distinct from the one-field model in terms of DM halo counts
and soliton formation time.
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