APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

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
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 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 [4] and interferometry [5] (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 [8]. I also discuss screening mechanisms and environmental effects that may arise in scalar-field models, including models of ultralight dark matter [9], as well as chameleon [10] and symmetron models [11].

[1] Y. V. Stadnik and V. V. Flambaum, Phys. Rev. Lett. 114, 161301 (2015).

[2] Y. V. Stadnik and V. V. Flambaum, Phys. Rev. Lett. 115, 201301 (2015).

[3] Y. V. Stadnik and V. V. Flambaum, Phys. Rev. A 94, 022111 (2016).

[4] Y. V. Stadnik and V. V. Flambaum, Phys. Rev. A 93, 063630 (2016).

[5] H. Grote and Y. V. Stadnik, Phys. Rev. Research 1, 033187 (2019).

[6] D. Antypas et al., arXiv:2203.14915.

[7] C. Antel et al., arXiv:2305.01715.

[8] Y. V. Stadnik, Phys. Rev. Lett. 131, 011001 (2023).

[9] A. Hees, O. Minazzoli, E. Savalle, Y. V. Stadnik and P. Wolf, Phys. Rev. D 98, 064051 (2018).

[10] C. Burrage, E. J. Copeland and E. A. Hinds, JCAP 03 (2015) 042.

[11] Y. V. Stadnik, Phys. Rev. D 102, 115016 (2020).