Thursday, March 18, 2021, 16:00
online only
(for the zoom link contact michael.spira@psi.ch, emanuele.bagnaschi@psi.ch or
pulak.banerjee@psi.ch)
Yevgeny Stadnik, IPMU, University Tokyo
Abstract:
I present a brief overview of some novel detection strategies for
ultra-low-mass bosonic dark matter that forms a coherently oscillating
classical field. Possible effects of such dark-matter fields include
apparent variations of the fundamental "constants" and time-varying
spin-precession effects. These effects can be sought with a diverse
variety of precision, low-energy (and often table-top) experiments,
including: spectroscopy (clock) and optical cavity measurements, optical
interferometry, torsion pendula and other "fifth-force" experiments,
magnetometry techniques, g-factor measurements, and big bang
nucleosynthesis. Existing and new experimental and observational data
have allowed us and other groups to improve on previous observational
bounds on possible non-gravitational interactions of dark matter with
ordinary matter by many orders of magnitude. I have also recently placed
much improved bounds on macroscopic domain walls from the consideration
of novel signatures associated with an environmental dependence and
spatial variations of the fundamental constants.