2 research outputs found
Space-time variation of the s and c quark masses
Space-time variation of fundamental physical constants in expanding Universe
is predicted by a number of popular models. The masses of second generation
quarks are larger than first generation quark masses by several orders of
magnitude, therefore space-time variation in quark masses may significantly
vary between each generation. We evaluate limits on variation in the s and c
quark masses from Big Bang nucleosynthesis, Oklo natural nuclear reactor, Yb+,
Cs and Rb clock data. The construction of 229Th nuclear clock is expected to
enhance these limits by several orders of magnitude. Furthermore, constraints
are obtained on an oscillating scalar or pseudoscalar cold dark matter field,
as interactions of the field with quarks produce variations in quark masses
Effects of the long-range neutrino-mediated force in atomic phenomena
As known, electron vacuum polarization by nuclear Coulomb field produces
Uehling potential with the range . Similarly, neutrino vacuum
polarization by boson field produces long range potential
with a very large range . Measurements of macroscopic effects
produced by potential give limits on the effective interaction
constant which exceed Fermi constant by many orders of
magnitude, while limits from spectroscopy of simple atomic systems are
approaching the standard model predictions. In the present paper we consider
limits on from muonium, positronium, hydrogen and deuterium spectra
and isotope shift in hydrogen and heavy atoms including corrections leading to
the King plot non-linearity.Comment: 8 pages, 3 figures, 4 table