6 Spatial Variations

The constraints on the variation of the fundamental constant that we have described so far are mainly related to their cosmological evolution so that, given the Copernican principle, they reduce to constrains on the time variation of the fundamental constants. Indeed, spatial variations can also occur. They may be used to set constraints in two regimes:

 6.1 Local scales
  6.1.1 Generalities
  6.1.2 Solar system scales
  6.1.3 Milky Way
 6.2 Cosmological scales
 6.3 Implication for the universality of free fall

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