Dark Matter Candidates & Detection: Observation, Measurement & Evidence

Searches fall into direct detection of scattering in laboratory targets, indirect detection of annihilation or decay products, collider production, astrophysical structure tests, and compact-object lensing surveys.

No proposed particle has yet been confirmed as the dominant dark matter. Direct-detection experiments, gamma-ray and cosmic-ray searches, collider results, lensing, CMB data, and small-scale structure progressively constrain parameter space.

Different candidates predict different masses, interaction strengths, production histories, and clustering properties. Cold dark matter behaves nonrelativistically during structure formation, while warmer or ultralight candidates can suppress structure below characteristic scales.

Null searches progressively exclude parameter regions but do not exclude dark matter as a phenomenon. Astrophysical observations constrain compact objects and warm/ultralight candidates in ways laboratory detectors cannot.