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SUMMARY:Axion-Like Dark Matter Feedback from Subgalactic Baryon Redistribu
 tion
DTSTART;VALUE=DATE-TIME:20260922T124000Z
DTEND;VALUE=DATE-TIME:20260922T124500Z
DTSTAMP;VALUE=DATE-TIME:20260914T072136Z
UID:indico-contribution-526@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Andriy Nazarenko (Bogolyubov Institute for Theoretic
 al Physics of NAS of Ukraine)\nWe investigate the hydrodynamic and quantum
  evolution of dark matter (DM) modeled as a Bose–Einstein condensate (BE
 C) with axion-like self-interaction within dwarf galaxies. The periodic na
 ture of the interaction induces a multiphase halo structure with alternati
 ng stability zones\, where low-density spatial tails undergo spinodal deco
 mposition and fragment into clump- and foam-like structures [1]. While a m
 assive solitonic core (~12% of total mass) provides local gravitational sh
 ielding\, subgalactic structures remain highly susceptible to perturbation
 s driven by baryonic redistribution. Focusing on the core boundary of NGC 
 2366\, we show that baryonic variations induce a DM gravitational trap tha
 t enables long-term gas cooling and collapse\, predicting the formation of
  a $10^6$ M_ʘ star cluster over 50 Myr. Conversely\, linearized simulatio
 ns of localized feedback scenarios (shell dynamics and dynamical friction)
  reveal highly suppressed DM winds (≲several m/s)\, challenging direct o
 bservational detection. To address the long-term cumulative impact of mult
 iple baryonic events\, we develop a quantum excitation framework. We demon
 strate that the lowest long-wavelength radial mode acts as a false vacuum 
 state\, undergoing non-viscous quantum relaxation with a characteristic de
 cay lifetime of 68 Myr [2]. This mechanism drives a universal exponential 
 damping of the system's evolution\, while a nonlinear three-mode parametri
 c energy exchange governs the subsequent redistribution of stable quasipar
 ticle excitations.\n\n[1]	A. Nazarenko\, Macroscopic states in Bose–Eins
 tein condensate dark matter model with axionlike interaction\, Eur. Phys. 
 J. C 85 (2025) 1171.\n[2]	A. Nazarenko\, Axionlike dark-matter winds drive
 n by galactic baryon redistribution\, arXiv:2603.22234 [astro-ph.GA].\n\nh
 ttps://indico.bitp.kiev.ua/event/18/contributions/526/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/526/
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