Abstract:
Ultra-low-mass bosonic particles produced non-thermally in the early Universe may form a coherently oscillating classical field that can comprise the observed cold dark matter. The very high number density of such particles can give rise to characteristic wave-like signatures that are distinct from the particle-like signatures considered in more traditional searches for WIMP dark matter. In particular, ultra-low-mass scalar dark matter may induce apparent variations of the fundamental “constants” of Nature, while ultra-low-mass pseudoscalar (axionlike) dark matter may induce time-varying spin-precession effects (including oscillating electric dipole moments). I discuss the basic principles of and recent results in searches for ultra-low-mass dark matter using a variety of precision low-energy experiments, including atomic spectroscopy, optical cavities and interferometers, torsion pendula, magnetometry, neutron experiments and g-factor measurements.
Biography:
Dr Yevgeny Stadnik completed his PhD at the University of New South Wales (UNSW Sydney) in Australia. He was a Humboldt Research Fellow at the Helmholtz Institute Mainz within the Johannes Gutenberg University of Mainz in Germany, and a Kavli Fellow and Assistant Professor at the Kavli Institute for the Physics and Mathematics of the Universe within the University of Tokyo in Japan. Yevgeny is currently an Australian Research Council DECRA Fellow and Senior Lecturer at the University of Sydney in Australia. He has 57 refereed publications in international physics and science journals. His research interests include the manifestations and phenomenology of dark matter and new physics in precision low-energy atomic and astrophysical phenomena.
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