Research Projects 2025 Bedretto lab magnetic environment characterization for future atomic interferometer gravitational wave detectors Guandi Zhao, Johannes Wüthrich, Marcelle Soares-Santos experimental physics remote long measurement atomic intereferometer 2025 Halo spin and orientation in interacting dark matter dark energy cosmology Guandi Zhao, Jiajun Zhang, Peng Wang, and Ji Yao cosmology N-body simulation