Speaker
Description
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, recent results and future possibilities 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.
References:
[1] Y. V. Stadnik and V. V. Flambaum, Physical Review D 89, 043522 (2014).
[2] Y. V. Stadnik and V. V. Flambaum, Physical Review Letters 114, 161301 (2015).
[3] Y. V. Stadnik and V. V. Flambaum, Physical Review Letters 115, 201301 (2015).
[4] Y. V. Stadnik and V. V. Flambaum, Physical Review A 94, 022111 (2016).
[5] Y. V. Stadnik and V. V. Flambaum, Physical Review A 93, 063630 (2016).
[6] C. Abel et al., Physical Review X 7, 041034 (2017).
[7] A. Hees, O. Minazzoli, E. Savalle, Y. V. Stadnik and P. Wolf, Physical Review D 98, 064051 (2018).
[8] H. Grote and Y. V. Stadnik, Physical Review Research 1, 033187 (2019).
[9] C. Smorra et al., Nature 575, 310 (2019).
[10] Y. V. Stadnik, Physical Review Letters 131, 011001 (2023).
[11] C. Abel et al., SciPost Physics 15, 058 (2023).
[12] Y. V. Stadnik, Nature Astronomy 8, 434 (2024).
[13] P. Fierlinger, M. Holl, D. Milstead, V. Santoro, W. M. Snow and Y. V. Stadnik, Physical Review Letters 133, 181001 (2024).
[14] P. Fierlinger, J. Sheng, Y. V. Stadnik and C.-Y. Xing, arXiv:2412.10832.
[15] A. Banerjee, I. M. Bloch, Q. Bonnefoy, S. A. R. Ellis, G. Perez, I. Savoray, K. Springmann and Y. V. Stadnik, arXiv:2502.04455.
