Dark Cosmos Seminar: Saptarshi Chaudhuri

Sep 20, 2022, 4:00 pm5:30 pm
Joseph Henry Room
Event Description

QCD axions and Dark Matter Radio

The QCD axion, originally posed a solution to the strong CP problem, is among the most compelling candidates in the hunt for dark matter. The last decade has seen the emergence of several new ideas to search for axion dark matter. In this talk, I overview the landscape of experimental searches and describe Dark Matter Radio (DMRadio), a family of electromagnetic searches for axion dark matter below 1 ueV (240 MHz). The long-term goal of the DMRadio program is to probe QCD axions from ~1 ueV to ~1 neV, corresponding to the well-motivated GUT scale. I present the current status of the DMRadio program and experimental development for DMRadio and axion searches at Princeton, including high-Q lumped-element resonators, high-field superconducting magnets, near-quantum-limited amplifiers, and future plans for electromagnetic sensors evading the Standard Quantum Limit in the kHz-MHz frequency ranges.