In the last time the cold dark matter (CDM) model has suggested more and more that it is not
able to describe all the properties of nearby galaxies that can be observed in great detail as …

We consider the possibility that the dark matter which is required to explain the dynamics of
the neutral hydrogen clouds at large distances from the galactic centre could be in the form …

We model massive dark objects at centers of many galaxies as Schwarzschild black hole
lenses and study gravitational lensing by them in detail. We show that the ratio of mass of a …

We model the massive dark object at the center of the Galaxy as a Schwarzschild black hole
as well as Janis-Newman-Winicour naked singularities, characterized by the mass and …

We investigate the possibility that the observed behavior of test particles outside galaxies,
which is usually explained by assuming the existence of dark matter, is the result of the …

Numerical simulations show that a massive real scalar field in a nonlinear theory can form
long-lived oscillating localized states. For a self-interacting scalar on a fixed background …

Using the scalar field dark matter (SFDM) model, it is proposed that galaxies form by
condensation of a scalar field (SF) very early in the Universe, forming Bose–Einstein …

We consider the global cosmological evolution and the evolution of the density contrast in
the Bose–Einstein condensate dark matter model, in the framework of a post-Newtonian …

We consider solutions with conformal symmetry of the static, spherically symmetric
gravitational field equations in the vacuum in the brane world scenario. By assuming that the …

We present an exhaustive analysis of the numerical evolution of the Einstein–Klein–Gordon
equations for the case of a real scalar field endowed with a quadratic self-interaction …