Experimental bounds on the coupling strength of torsion potentials

Details Experimental bounds on the coupling strength of torsion potentials Experimental bounds on the coupling strength of torsion potentials

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phrvd..21.2075n&link_type=abstract

Physical Review D (Particles and Fields), Volume 21, Issue 8, 15 April 1980, pp.2075-2080

Physics

18

Scientific paper

We examine the experimental implications of a recent suggestion by Kaempffer that the coupling strength G' for a propagating torsion potential need not be the same as the Newtonian gravitational coupling strength G. We allow the torsion potential to transform either as a six-tensor, or as a pseudoscalar. In neutrino-electron and neutrino-nucleon scattering, we find that pseudoscalar exchange does not contribute, while exchange of the six-tensor closely simulates exchange of a Z0. Agreement of data with Weinberg-Salam neutral current theory is preserved if 4πG'<0.14GFc2ℏ2, where GF is the Fermi μ decay constant. If we demand that emission of torsion quanta not destroy the energy balance in helium-burning stars, we get a much stronger bound 4πG'<5×10-19GFc2ℏ2. This bound applies to both cases, pseudoscalar as well as six-tensor. It may be rewritten G'<1(1.5×1012 GeV)2 in natural units. For comparison, G=1(1.2×1019 GeV)2.

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