The Cryogenic Dark Matter Search (CDMS) is an experiment designed to directly detect particle dark matter in the form of WIMPs. The CDMS detectors measure the ionization and phonons produced by every particle interaction in their germanium and silicon crystal substrates. These two measurements determine the energy deposited in the crystal in each interaction, but also give information about what kind of particle caused the event. This allows most of the unwanted background interactions to be rejected, so that any WIMP-scattering events can be identified even if they are very rare. CDMS collected WIMP search data in a shallow underground site at Stanford University through 2002, and has operated in the Soudan Mine since 2003. Its results so far are negative, but CDMS is able to provide the most sensitive limits on WIMP dark matter in many interesting models. In cosmology, dark matter consists of elementary particles that cannot be detected by their emitted radiation but whose presence can be inferred from gravitational effects on visible matter such as stars and galaxies. ... This article is about the hypothetical class of particles. ... ... A phonon is a quantized mode of vibration occurring in a rigid crystal lattice, such as the atomic lattice of a solid. ... For other meanings of Stanford, see Stanford (disambiguation). ... 2002 is a common year starting on Tuesday of the Gregorian calendar. ... The Soudan Underground Mine is described as Minnesotas oldest, deepest, and richest iron mine. ... 2003 is a common year starting on Wednesday of the Gregorian calendar, and also: The International Year of Freshwater The European Disability Year Events January January 1 - Luíz Inácio Lula Da Silva becomes the 37th President of Brazil. ...
Among the observed phenomena consistent with the existence of darkmatter are the rotational speeds of galaxies and orbital velocities of galaxies in clusters, gravitational lensing of background objects by galaxy clusters such as the Bullet cluster, and the temperature distribution of hot gas in galaxies and clusters of galaxies.
Darkmatter is crucial to the Big Bang model of cosmology as a component which corresponds directly to measurements of the parameters associated with Friedmann cosmology solutions to general relativity.
Large computer simulations of billions of darkmatter particles have been used to confirm that the cold darkmatter model of structure formation is consistent with the structures observed in the universe through galaxy surveys, such as the Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey, as well as observations of the Lyman-alpha forest.
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