[kenhikage]

Given that photons don't experience time (which I agree with as tachyons should have negative mass  and travel backward through time) shouldn't they fill infinite space? Or am I misjudging that relationship?

[lightarrow]

Do you mean that the inertial force I feel ten lights from Earth is different from what I would feel near Earth?

No, I mean that *in a small region of spacetime* equivalence principle holds; globally it doesn't always hold, but unfortunately GR is very complex, I just know that because of someone more aknowledged than me.

[Ron Hughes]

Ken, from your question I must assume you consider my post on JJ Thompson's explanation on how a photon is created is wrong? As far as the tachyon, I dislike discussing particles that are hypothetical.