Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
A 35.15: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Detection of Ultra-light Dark Matter with a Network of Cavities — •Luis Hellmich1,2, Cigdem Issever1,2, Ullrich Schwanke2, and Steven Worm1,2 — 1DESY Zeuthen, Zeuthen, Deutschland — 2Humboldt-Universität zu Berlin, Berlin, Deutschland
The measurement of the temporal variation of fundamental constants would be strong evidence for new physics. In particular, many differ- ent theories predict the variation of the fine-structure constant α and proton-to-electron mass ratio µ. Optical atomic clocks and cavities are high precision measurement devices, which are sensitive to variations of the fundamental constants. In this work, we are investigating the sensitivity of a network of cavities to variations of fundamental con- stants induced by ultra-light dark matter (ULDM). ULDM is expected to oscillate coherently on macroscopic length scales. We are exploring the possibility to detect such oscillations with a network of spatially separated cavities. The proposed setup could detect frequencies in the sub-Hz regime, making it possible to constrain dark matter masses m > 10−14 eV. We present projected limits on the scalar coupling to Standard Model particles for a few benchmark scenarios and compare them to existing constraints from equivalence principle tests.
Keywords: Network of optical cavities; Variation of fundamental constants; Dark matter