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Title: Tidal disruption of solitons in self-interacting ultralight axion dark matter

Journal Article · · Physical Review. D.

We report 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. Specifically, using the pseudospectral solver UltraDark.jl, we simulate the tidal disruption of self-interacting solitonic cores as they orbit a 1011 M Navarro-Frenk-White CDM host halo potential for a range of orbital parameters, assuming a fiducial ULA particle mass of 10-22 eV . We find that repulsive (attractive) self-interactions significantly accelerate (decelerate) soliton tidal disruption. We also identify a degeneracy between the self-interaction strength and soliton mass that determines the efficiency of tidal disruption, such that disruption timescales are affected at the ~ 50 % level for variations in the dimensionless ULA self-coupling from λ = -10-92 to λ = 10-92 .

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Simons Foundation; Sloan Foundation; USDOE Office of Science (SC), High Energy Physics (HEP); Simmons Foundation
Grant/Contract Number:
AC02-76SF00515; PHY-1748958; 1929080; PHY-1607611; AC02-07CH11359; PHY-1929080
OSTI ID:
1879840
Alternate ID(s):
OSTI ID: 1874298
Report Number(s):
FERMILAB-PUB-22-459-V; arXiv:2205.10336; NSF PHY-1748958; 1929080; PHY-1607611; TRN: US2307670
Journal Information:
Physical Review. D., Vol. 105, Issue 12; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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