Figure 6
From: Measuring the stability of fundamental constants with a network of clocks
Parameter spaces for a model of an oscillating scalar dark-matter field interacting with (a) the electromagnetic field and (b) the electron via the linear-in-ϕ interactions in Eq. (15). The estimated sensitivities of clocks within the QSNET network to apparent oscillations of the fundamental constants are shown by the green lines. Also shown are existing limits from previous searches for oscillations of the fundamental constants via clock comparisons (blue region) [21, 128, 129], clock-cavity comparisons (red regions) [132], optical interferometry (yellow regions) [133] and a resonant-mass detector (narrow orange regions) [134], as well as complementary bounds from searches for equivalence-principle-violating forces (grey regions) [135–138]. See the main text for more details