Speaker
Dr
Yevgeny Stadnik
(Johannes Gutenberg University of Mainz)
Description
Measurements of electric dipole moments (EDMs) in atoms, molecules and neutrons serve as sensitive probes of new physics. We give a brief overview of atomic EDM theory [1] and discuss several recent applications of EDM-based measurements to search for new particles.
New bosons can mediate anomalous forces between standard-model particles. Using data from existing atomic and molecular EDM measurements, we have placed limits on P,T-violating scalar-pseudoscalar interactions mediated by spinless bosons, improving on previous laboratory bounds from other experiments by many orders of magnitude for a broad range of boson masses [2,3].
Ultra-low-mass bosonic dark matter particles produced after the Big Bang may form an oscillating classical field. The interaction of this oscillating field with standard-model fermions and gluons can give rise to time-varying spin-dependent effects, including “axion wind” spin-precession effects and time-varying electric dipole moments, which can be sought for with atomic magnetometry, ultracold neutron and torsion pendulum experiments [4-6]. Recently, the nEDM collaboration performed the first experimental search for these effects, in the process improving on previous bounds by up to a factor of 1000 [7].
References
[1] J. S. M. Ginges, V. V. Flambaum, Phys. Rep. 397, 63 (2004).
[2] Y. V. Stadnik, V. A. Dzuba, V. V. Flambaum, Phys. Rev. Lett. 120, 013202 (2018).
[3] V. A. Dzuba, V. V. Flambaum, I. B. Samsonov, Y. V. Stadnik, arXiv:1805.01234.
[4] V. V. Flambaum, talk at 2013 Patras Workshop.
[5] Y. V. Stadnik, V. V. Flambaum, Phys. Rev. D 89, 043522 (2014).
[6] Y. V. Stadnik, Manifestations of Dark Matter and Variations of the Fundamental Constants of Nature in Atoms and Astrophysical Phenomena, (Springer, Cham, Switzerland, 2017).
[7] C. Abel et al., Phys. Rev. X 7, 041034 (2017).
Primary author
Dr
Yevgeny Stadnik
(Johannes Gutenberg University of Mainz)
Co-author
Prof.
Victor Flambaum
(University of New South Wales)
