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

TL;DR

This paper explores how dark matter condensates influence accretion disk luminosity and structure in spherical spacetimes, revealing potential observational signatures to distinguish dark matter models.

Contribution

It introduces a model of dark matter from neutrino mass mixing, computes Yukawa corrections to gravitational potential, and analyzes their effects on accretion disk properties.

Findings

Dark matter condensates cause measurable deviations in disk luminosity.

Yukawa corrections from dark matter alter the geodesic structure around black holes.

Accretion disk spectra could help identify the nature of dark matter.

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.