"In this paper, we have described five scenarios for fixed-target experiments that probe kinetically mixed U(1)'s with MeV-GeV masses. Kinetic mixing of size ε ~ 10- 2 -- 10 -8 between a light gauge boson and the photon can be generated by loops of particles at any mass scale, with the magnitude determined by the structure of high-scale physics. An MeV-GeV mass for the A0 can in turn be generated from the weak scale, especially in a supersymmetric context. An A0 in this mass range is also of interest as a possible explanation of several current dark matter anomalies."
Taken from "New Fixed Target Experiments to Search for Dark Gauge Forces"
Instead of speculating what Dark Energy and Matter are, James Bjorken chooses to concretely propose ways to check parameter space regions not explored yet, and suggested by Astronomical observations.
Speculators are good, but doers are better.
Unfortunately I feel that Prof. Bjorken is not listen to as much as he deserves it.
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