The speed of light does not change if you set c = 1 (for a unit time; the vacuum energy without spin/gravity in the parking lot in one positive dimension - there is no momentum in a conserved relativistic system where only rest energy is relevant).

I have just produced a .pdf to show how the vacuum energy relates to the Dirac matrix in terms of STR:

The Pauli/Dirac Matrices (too much tex to write here, until I can get the whole thing done) ,

in the Relativity section of my website, and will be continuing to show its relation to the Pauli matrices in the coming weeks (STR and GTR)....

The topic of Signal Processing and Analysis is pure mathematics without explicit mass ....

(the Dirac delta function is a unit impulse in "time"; "an area" - i.e., an abstract "amplitude" integrated to unity). It is related to QFT by the Green's function.

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