: : : : No they do not. In general relativity local space-time is always flat and therefore by definition the properties of space-time do not change.

: : understood... however, how are the constants : : of permeability and permitivity derived from : : space, other than just measuring vacuum as a constant.

: : What makes the constant of P/P what they are? : : What are they directly corrolated to?

: : The mass density of the cosmos, perhaps?

: Isn't P/P dependant on the speed of light? : I believe:

: Permittivity constant= 1/(speed of light squared x permeability constant)

right, it is the reciprocal of the velocity of light, but my question could be also stated as the following:

what then causes the speed of light to be what it is?

likewise: what causes the permitivity constant to be what it is?

Is it related to the mass density of the cosmos?