Investigation of two colliding solitonic cores in Fuzzy Dark Matter
  models
  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.
