Millimeter-wave technologies assist in examining 'light' dark matter. Scientists at Kyoto University have developed an experimental method to examine ultra-light dark matter by observing its gravitational effects on visible matter. Using millimeter-wave sensing in cryogenic conditions, the team ach
Searching for Dark Photon Dark Matter with a Cryogenic Millimeter-Wave Receiver. Credit: KyotoU Global Comms/Shunsuke AdachiScientists at Kyoto University have developed an experimental method to examine ultra-light dark matter by observing its gravitational effects on visible matter. Using millimeter-wave sensing in cryogenic conditions, the team achieved experimental parameters for unexplored mass ranges of darkdark matter using new techniques.
The elusive mass of a single dark matter particle has been assumed to be heavier than that of a proton. Adachi’s team’s search for ultra-low-mass dark matter addresses the extremely challenging problem of detection that has eluded scientists for over three decades. A dedicated millimeter-wave receiver is cooled to -270 ℃ to suppress thermal noise to accommodate weak conversion photons. This cryogenic receiver is used to search for DPDMs with a mass range of about 0.1 meV.
Ordinary photons are theoretically converted from dark photons using metal plate surfaces. These conversion photons correspond to the mass of dark photons because of energy conservation. For example, the conversion photon frequency of 10-300 GHz corresponds to dark photon mass from 0.05 to 1 meV.
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