Investigation of two colliding solitonic cores in Fuzzy Dark Matter models

Abstract

One of the challenging questions in cosmology is the nature of dark matter particles. Fuzzy Dark Matter (FDM) is one of the candidates which is made of very light ($m_{FDM}\simeq 10^{-22}-10^{-21}$ eV) bosonic particles with no self-interaction. It is introduced by the motivation to solve the core-cusp problem in the galactic halos. In this work, we investigate the observational features from FDM halo collisions. Taking into account the quantum wave-length of the condensed bosonic structure, we determine the interference of the wave function of cores after collision. The fringe formation in the wave function is associated to the density contrast of the dark matter inside the colliding galaxies. The observational signatures of the fringes of the distribution of the dark matter are (i) on the lensing of the background sources, (ii) accumulation of the baryonic plasma tracking the interference of the FDM potential and (iii) excess in the X-ray emission from dense regions. Finally, we provide prospects for the observations of quantum wave features of FDM in the colliding galaxies. The NGC6240 colliding galaxy at the redshift of $z=0.024$ is a suitable candidate for this study. No signal is detected from the fringes in the Chandra data and taking into account the angular resolution of the telescope, we put constrain of $m>7\times 10^{-23}$ eV on the mass of FDM particles.

15 pages, 16 figures. Comments are welcome

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• Testing MOdified Gravity (MOG) theory and dark matter model in Milky Way using the local observables
• Stable vortex structures in colliding self-gravitating Bose-Einstein condensates
• Constraint on the mass of fuzzy dark matter from the rotation curve of the Milky Way
• Bose-Einstein condensate dark matter model with three-particle interaction and two-phase structure
• Prospects of Probing Dark Matter Condensates with Gravitational Waves
• Construction and evolution of equilibrium configurations of the Schrödinger-Poisson system in the Madelung frame
• Constraining Ultralight Axions with Galaxy Surveys
• Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales
• Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter