Speaker
Description
Light dark matter, whose mass is typically less than ~1 meV, is becoming one of the attractive candidates since there is no evidence for the detection of the Weakly Interacting Massive Particle (WIMP). It has a long coherence length. Therefore, it is called wavy dark matter and the approach for it is different from the WIMP searches. Now, many experiments are searching for wavy dark matter such as axions, axion-like particles, and dark photons in the mass range of 1 ueV--1 meV. These dark matter candidates can convert into ordinary light and the signal light frequency corresponds to the mass of the dark matter. The frequency is roughly 1--100 GHz. One of the mature methods to search for such a wavy dark matter is the microwave cavity. However, it has the disadvantage of its narrow bandwidth. Another method is to collect the signal light with antennas or reflectors. In this method, the bandwidth can be large like more than 10 GHz. In this talk, I'd like to introduce the principle of wavy dark matter searches with antennas or reflectors and present the status and plans for several experiments.
