Talk detail

Participant	Flambaum, Victor
Institution	University of New South Wales - School of Physics - Sydney - NSW - Australia

Session	PT4	Accepted	Yes	Order	5	Time	17:15	20'
Talk	Oral abstract	Title	Enhanced Effects Of Dark Matter, Variation Of The Fundamental Constants And Violation Of The Fundamental Symmetries
Coauthors	Flambaum, Victor V.; Stadnik, Yevgeny V.
Abstract	Interaction between the density of the dark matter particles and ordinary matter produces both ‘slow’ cosmological evolution and oscillating variations of the fundamental constants including the fine structure constant alpha and particle masses. Atomic Dy, Rb and Cs spectroscopy measurements and the primordial helium abundance data allowed us to improve on existing constraints on the quadratic interactions of the scalar dark matter with the photon, electron, quarks and Higgs boson by up to 15 orders of magnitude. Limits on the linear and quadratic interactions of the dark matter with W and Z bosons have been obtained for the first time. Other effects of dark matter and dark energy include apparent violation of the fundamental symmetries: oscillating or transient atomic electric dipole moments, precession of electron and nuclear spins about the direction of Earth’s motion through an axion dark matter (the axion wind effect), and axion-mediated spin-gravity couplings, violation of Lorentz symmetry and Einstein equivalence principle. Recent measurements by nEDM collaboration improved the limits on interaction of the low-mass axion with gluons and nucleons up to 3 orders of magnitude. Effects of scalar field produced by massive bodies on atomic transition frequencies have been experimentally investigated. Improved limits on axions and low mass Z' boson have been derived from atomic EDM and PNC.
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Session	DM1	Accepted	Yes	Order	7	Time	18:45	30'
Talk	Oral abstract	Title	Dark Matter Scattering Off Electrons
Coauthors	Flambaum, Victor V.; Roberts, Benjamin; Gribakin, Gleb F.; Pospelov, Maxim; Dzuba, Vladimir V.; Stadnik, Yevgeny V.
Abstract	Dark matter particles have small velocity in comparison with velocities of atomic electrons. In the adiabatic approximation all the transitions could be exponentially suppressed. However, due to the cusp of Coulomb functions at r=0 the suppression of atomic ionization is only by a power of the momentum transfer, q^-n. The electron relativistic effects are large near r=0, change the power from n=8 in the non-relativistic case to n=6-Z^2 alpha^2 and enhance the differential cross section by up to 1000 times. The results of our relativistic many-body calculations are used to interpret possible detection of Dark matter by DAMA collaboration as well as the results of XENON and other experimental groups. References: Ionization of atoms by slow heavy particles, including dark matter. B. M. Roberts, V. V. Flambaum, and G. F. Gribakin, Phys. Rev. Lett. 116, 023201 (2016). Dark matter scattering on electrons: Accurate calculations of atomic excitations and implications for the DAMA signal. B. M. Roberts, V. A. Dzuba, V. V. Flambaum, M. Pospelov, and Y. V. Stadnik, Phys. Rev. D 93, 115037 (2016).
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Session	BS2	Accepted	Yes	Order	2	Time	15:45	15'
Talk	Oral abstract	Title	Enhanced non-gravitational effects of dark matter in astrophysics and laboratory experiments
Coauthors	Flambaum, Victor V.; Stadnik, Yevgeny V.
Abstract	Low-mass boson dark matter particles produced after Big Bang form classical field and/or topological defects. In contrast to traditional dark matter searches, effects produced by interaction of an ordinary matter with this field and defects may be first power in the underlying interaction strength rather than the second power or higher (which appears in a traditional search for the dark matter).This may give an enormous advantage since the dark matter interaction constant is extremely small. Interaction between the density of the dark matter particles and ordinary matter produces both ‘slow’ cosmological evolution and oscillating variations of the fundamental constants including the fine structure constant alpha and particle masses. Atomic Dy, Rb and Cs spectroscopy measurements and the primordial helium abundance data allowed us to improve on existing constraints on the quadratic interactions of the scalar dark matter with the photon, electron, quarks, W, Z and Higgs boson by up to 15 orders of magnitude. Other effects of dark matter include oscillating or transient atomic electric dipole moments and precession of electron and nuclear spins about the direction of Earth’s motion through an axion dark matter. Recent measurements by nEDM collaboration improved the limits on interaction of the low-mass axion with gluons and nucleons up to 3 orders of magnitude.
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Session	DM2	Accepted	Yes	Order	4	Time	16:25	25'
Talk	Oral abstract	Title	Ionisation of Atoms by WIMP Scattering On Electrons
Coauthors	B. Roberts, G. Gribakin, V. Dzuba, M. Pospelov, Y. Stadnik
Abstract	Electron relativistic effects increase differential cross section for ionisation of atoms by heavy slow particles scattering on electrons by several orders of magnitude. The applications include WIMP scattering on electrons studied in the underground laboratories by several experimental groups including DAMA, XENON and others.
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