Investigation of two colliding solitonic cores in Fuzzy Dark Matter models

TL;DR

This paper explores the quantum interference patterns of colliding fuzzy dark matter cores and their potential observational signatures, providing constraints on particle mass through galaxy collision data.

Contribution

It introduces a novel analysis of wave interference effects in FDM collisions and links these to observable phenomena, offering new methods to detect or constrain FDM properties.

Findings

No fringe signals detected in Chandra data

Constraints on FDM particle mass: m > 7 x 10^{-23} eV

Potential observational signatures identified for future studies

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 $m> 7 \times10^{-23}$ eV on the mass of FDM particles.