Abstract:
We investigate the luminosity of the accretion disk for a static black hole surrounded by dark
matter with anisotropic pressure. We calculate all basic orbital parameters of test particles in the
accretion disk, such as angular velocity, angular momentum, energy and radius of the innermost
circular stable orbit as functions of the dark matter density, radial pressure and anisotropic param eter, which establishes the relationship between the radial and tangential pressures. We show that
the presence of dark matter with anisotropic pressure makes a noticeable difference in the geometry
around a Schwarzschild black hole, affecting the radiative flux, differential luminosity and spectral
luminosity of the accretion disk.