The Futile Search for Galactic Disk Dark Matter

TL;DR

This paper critically examines previous methods for detecting dark matter in the galactic disk, arguing that the disk's non-equilibrium state invalidates the Poisson-Boltzmann approach and questions earlier positive detections.

Contribution

It introduces a new analysis using the Virial Theorem, challenging the assumption of equilibrium and casting doubt on prior dark matter claims in the galactic disk.

Findings

Vertical density profile is not in equilibrium

Poisson-Boltzmann approach is inappropriate

Previous positive results are questionable

Abstract

Several approaches have been used to search for dark matter in our galactic disk, but with mixed results: {\em maybe yes and maybe no}. The prevailing approach, integrating the Poisson-Boltzmann equation for tracer stars, has led to more definitive results: {\em yes and no}. The touchstone {\em yes} analysis of Bahcall et al. (1992) has subsequently been confirmed or refuted by various other investigators. This has been our motivation for approaching the search from a different direction: applying the Virial Theorem to extant data. We conclude that the vertical density profile of the disk is not in a state of equilbrium and, therefore, that the Poisson-Boltzmann approach is inappropriate and it thereby leads to indefensible conclusions.