There are theoretical similarities between general relativity (GR) and quantum field theory (QFT). Among the most fundamental are that both are based on 2nd order wave equations and their associated potential theories and gauge considerations. In comparison SFT is based on the 1st order Maxwellian with its field variables that have a much reduced emphasis on gauge. Both GR and QFT are based around single particle analyses rather than the mutual effects that couple particles together studied in SFT. Finally both GR and quantum theory employ a metric that in the view of SFT serves to accommodate the over constraint of the basic equations. In both cases this is linked to a theoretical requirement for a zero-mass photon. Thus both quantum theory and GR depend upon a zero mass photon and hence from the point of view of SFT both quantum theory and GR are theoretical approximations. For quantum theory zero mass springs from the earliest observations of beta decay and again when a negligible rest mass of the photon could hardly be compared with the seemingly endless radiation from within the nucleus of the bombs dropped on Hiroshima and Nagasaki in 1945. The cosmological principle that had its genesis in the Vatican's unscientific and dogmatic dealings with Galileo was a way to avoid having any universal centre of gravity thus making the same mistake again. Nevertheless it is only an approximation in the light of SFT where it is seen that non-homogeneity and anisotropy are both present in the gravitational structure itself where space is divided into different gravitational regions. This structure depends on the composite nature and non-zero mass of the photon. The space within the Universe cannot be thought of as the surface of an expanding balloon other than as a theoretical approximation that holds for GR. It is known that at smaller than cosmological domains the cosmological principle does not hold for instance for any possible surviving location of the Big Bang. We may think of a biological tissue such as liver where the dielectric constant is averaged over the microstructure such as biological cells. While such an approximation is useful for numerical estimation it cannot be assumed to hold in any fine detail across smaller domains; this holds for both a homogenous isotropic model of liver and of the Cosmos.
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