|Speaker:||Yevgeny Stadnik (U Sidney )|
|Title:||Searches for Dark Matter with Precision Atomic and Optical Experiments, and Discussion of Screening Mechanisms and Environmental Effects|
|Date (JST):||Fri, Nov 24, 2023, 13:30 - 15:00|
|Place:||Seminar Room A|
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 traditional searches for WIMP dark matter. In particular, ultra-low-mass scalar dark matter may induce apparent variations of the fundamental “constants” of Nature [1,2]. I discuss the basic principles of and recent results in searches for ultra-low-mass scalar dark matter using precision low-energy experiments, including atomic spectroscopy [2,3], optical cavities  and interferometry  (see Refs. [6,7] and references therein for an overview of the most recent results). Spectroscopy in exotic atoms such as muonium may be used as a novel and complementary probe of dark matter . I also discuss screening mechanisms and environmental effects that may arise in scalar-field models, including models of ultralight dark matter , as well as chameleon  and symmetron models .
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 C. Antel et al., arXiv:2305.01715.
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 A. Hees, O. Minazzoli, E. Savalle, Y. V. Stadnik and P. Wolf, Phys. Rev. D 98, 064051 (2018).
 C. Burrage, E. J. Copeland and E. A. Hinds, JCAP 03 (2015) 042.
 Y. V. Stadnik, Phys. Rev. D 102, 115016 (2020).