Constraints on Light Pseudoscalars Implied by Tests of the Gravitational Inverse-Square Law
Abstract
The exchange of light pseudoscalars between fermions leads to a spin-independent potential in order g^4, where g is the Yukawa pseudoscalar-fermion coupling constant. This potential gives rise to detectable violations of both the weak equivalence principle (WEP) and the gravitational inverse-square law (ISL), even if g is quite small. We show that when previously derived WEP constraints are combined with those arisingfrom ISL tests, a direct experimental limit on the Yukawa coupling of light pseudoscalars to neutrons can be inferred for the first time (g_n^2/4pi < 1.6 \times 10^-7), along with a new (and significantly improved) limit on the coupling of light pseudoscalars to protons.
Keywords
Cite
@article{arxiv.hep-ph/9906240,
title = {Constraints on Light Pseudoscalars Implied by Tests of the Gravitational Inverse-Square Law},
author = {Ephraim Fischbach and Dennis E. Krause},
journal= {arXiv preprint arXiv:hep-ph/9906240},
year = {2009}
}
Comments
12 pages, Revtex, with 1 Postscript figure (submitted to Physical Review Letters)