Experimental techniques and instruments designed to observe or capture dark matter particles.Dark matter detection methods are experimental strategies designed to observe or capture dark matter particles, which are hypothesized to make up about 27% of the universe's mass-energy content. Despite overwhelming gravitational evidence for dark matter, its particle nature remains unknown. Detection methods fall into three broad categories: direct detection (looking for dark matter scattering off ordinary matter in underground detectors), indirect detection (searching for annihilation or decay products like gamma rays, neutrinos, or cosmic rays), and collider production (attempting to create dark matter particles in high-energy particle collisions).
The concept of dark matter was proposed by Fritz Zwicky in 1933, and the first direct detection experiments began in the 1980s. The field has grown significantly since the 2000s with the development of large-scale noble liquid detectors and space-based gamma-ray telescopes.
Direct detection experiments, such as XENON1T and LUX-ZEPLIN, use large volumes of ultra-pure liquid xenon or other materials, placed deep underground to shield from cosmic rays. They look for tiny nuclear recoils caused by dark matter particles (typically weakly interacting massive particles, or WIMPs) scattering off atomic nuclei. Indirect detection uses telescopes like Fermi-LAT or CTA to look for excess gamma rays from regions of high dark matter density, such as the galactic center or dwarf galaxies. Collider experiments at the LHC search for missing transverse energy signatures that would indicate dark matter particles escaping the detector.
These methods are used to search for dark matter particles, and while no definitive detection has been made, they place strong constraints on dark matter properties and guide theoretical models. The techniques also have applications in neutrino detection and rare event searches.
The DAMA/LIBRA experiment has claimed to observe an annual modulation signal consistent with dark matter for over 20 years, but this result remains controversial because other experiments have not confirmed it.
| P(r) | variable | capture probability at radius r — probability |
| r | variable | radial coordinate — radius metre |
| r_c | variable | outer horizon radius — radius metre |
| r_H | variable | inner horizon radius — radius metre |
| u | variable | integration variable — radius metre |
| f(u) | variable | metric function — metric function |
| ∫ | operator | computes the area under the curve of the integrand — integral operator |
| √ | operator | computes the principal square root — square root |
