Gyromagnetic factors and atomic clock constraints on the variation of fundamental constants
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
- Institut d'Astrophysique de Paris, UMR-7095 du CNRS, Universite Paris VI Pierre et Marie Curie, 98 bis bd Arago, 75014 Paris (France)
We consider the effect of the coupled variations of fundamental constants on the nucleon magnetic moment. The nucleon g-factor enters into the interpretation of the measurements of variations in the fine-structure constant, {alpha}, in both the laboratory (through atomic clock measurements) and in astrophysical systems (e.g. through measurements of the 21 cm transitions). A null result can be translated into a limit on the variation of a set of fundamental constants, that is usually reduced to {alpha}. However, in specific models, particularly unification models, changes in {alpha} are always accompanied by corresponding changes in other fundamental quantities such as the QCD scale, {Lambda}{sub QCD}. This work tracks the changes in the nucleon g-factors induced from changes in {Lambda}{sub QCD} and the light quark masses. In principle, these coupled variations can improve the bounds on the variation of {alpha} by an order of magnitude from existing atomic clock and astrophysical measurements. Unfortunately, the calculation of the dependence of g-factors on fundamental parameters is notoriously model-dependent.
- OSTI ID:
- 21608078
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.096004; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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ASTROPHYSICS
COMPUTERIZED SIMULATION
D QUARKS
FINE STRUCTURE
FUNDAMENTAL CONSTANTS
LANDE FACTOR
MAGNETIC MOMENTS
MASS
NUCLEONS
QUANTUM CHROMODYNAMICS
U QUARKS
BARYONS
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
PHYSICS
QUANTUM FIELD THEORY
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