fuzzy dark matter

Meanings

1. A type of dark matter with very low particle mass, with concomitant very large de Broglie wavelength (such as wavelength on the order of kiloparsecs), resulting in a population of overlapping waves, and concentrations of this dark matter modeled as fields and interference patterns, over astronomical and cosmological distances.

Etymology

From the lack of definition (fuzziness) due to the wave-like nature of fuzzy dark matter, unlike the particle-like of hot dark matter and cold dark matter.