Impact of flavor condensate dark matter on accretion disk luminosity in spherical spacetimes

Abstract

We investigate the impact of dark matter condensates on the emission and thermodynamic properties of accretion disks, in a spherically-symmetric and static background. We focus on a class of models where dark matter originates from a genuine mass mixing among neutrino fields and compute the corrections to the dark matter's potential within galactic halo. We find a corresponding Yukawa correction induced by the dark matter energy-momentum tensor over the Newtonian potential. In so doing, employing Schwarzschild coordinates, and adopting the Novikov-Thorne formalism, we compute the geodesic structure and the corresponding disk-integrated luminosity profiles. Assuming a constant mass accretion rate, constituted solely by baryonic matter, we find non-negligible deviations in both the disk structure and radiative output, as compared to the standard Schwarzschild case. Afterwards, we discuss physical consequences of our Yukawa correction, comparing it with recent literature, predicting similar potentials, albeit derived from extended theories of gravity. Accordingly, we thus speculate to use our results to distinguish among candidates of dark matter. Indeed, our findings suggest that incoming high-precision observations of accretion disk spectra may provide a tool to probe dark matter's nature under the form of particles, extended theories of gravity or condensates.