A History of Dark Matter

TL;DR

This historical review traces the evolution of dark matter from ancient notions of imperceptible matter to the modern non-baryonic paradigm, foregrounding dynamical evidence from clusters and rotation curves, and the shift from baryonic candidates and modified gravity to particle dark matter. It synthesizes theoretical developments (neutrinos, supersymmetry, axions, WIMPs) with observational advances and numerical simulations, showing how cosmology and particle physics converged to establish CDM as the leading framework. The work also documents early skepticism, the role of microlensing and baryon-budget constraints, and the eventual success of simulations in shaping modern searches. By outlining the experimental programs across direct detection, indirect detection, and axion experiments, the paper highlights the interdisciplinary collaboration driving the ongoing quest to identify dark matter particles and understand their role in cosmic structure formation.

Abstract

Although dark matter is a central element of modern cosmology, the history of how it became accepted as part of the dominant paradigm is often ignored or condensed into a brief anecdotical account focused around the work of a few pioneering scientists. The aim of this review is to provide the reader with a broader historical perspective on the observational discoveries and the theoretical arguments that led the scientific community to adopt dark matter as an essential part of the standard cosmological model.

Figures (8)

• Figure 1: A snapshot of the dark matter problem in the 1950s: the distance, mass, luminosity, and mass-to-light ratio of several galaxies and clusters of galaxies, as compiled by M. Schwarzschild in 1954 1954AJ.....59..273S.
• Figure 2: Flat rotation curves began to emerge clearly from 21 cm observations in the early 1970s. Here we show the hydrogen surface density profile (left) and the rotation curves (right) of five galaxies as obtained by Rogstad and Shostak in 1972 1972ApJ...176..315R. The bars under the galaxy names indicate the average radial beam diameter, i.e. the effective spatial resolution. R80 is the radius containing 80% of the observed HI.
• Figure 3: The rotation curves for the galaxies M31, M101, and M81 (solid lines) obtained by Roberts and Rots in 1973. The rotation curve of the Milky Way Galaxy was included by the authors for comparison. From Ref. 1973AA....26..483R.
• Figure 4: Rotation curve data for M31. The purple points are emission line data in the outer parts from Babcock 1939 1939LicOB..19...41B. The black points are from Rubin and Ford 1970 1970ApJ...159..379R (squares for the SW data, filled circles for the NE data, and open circles for the data in the inner parts -- the presence of non-circular motions in the inner parts makes the modelling of those data uncertain). The red points are the 21-cm HI line data from Roberts and Whitehurst 1975 1975ApJ...201..327R. The green points are 21-cm HI line data from Carignan et al. 2006ApJ...641L.109C. The black solid line corresponds to the rotation curve of an exponential disc with a scalelength according to the value given in Freeman 1970 1970ApJ...160..811F, suitably scaled in velocity. 21-cm data demonstrate clearly the mass discrepancy in the outer parts. Figure courtesy of Albert Bosma.
• Figure 5: The rotation curves of the 25 galaxies published by Albert Bosma in 1978 1978PhDT.......195B.