Einstein’s symmetric metric tensor (g) of general relativity is a 4 by 4 matrix with 16 real elements. In the special case where the trace (sum of diagonal elements) is 2, its sum of squares of elements describes a general invariance for a linear Lorentz transformation. This is simply the spacetime interval ds known as the proper time for all inertial systems that are relatively motionless or uniformly moving with respect to each other. For non-inertial systems (e.g. accelerated systems) the metric tensor must contains at the least 1 nonzero off-diagonal element but for linear symmetry, the trace vanishes while for nonlinear symmetry the trace must remains nonzero. Both conditions of nonzero elements and nonlinearity can be satisfied by using singular symmetric Hadamard matrices.
The key advantage of using the latter is their increasing eigenvalues of their power factors. It is noted that g=I, where I is the identity matrix. g=g, g=I, g=g, g=g, and g=I. Clearly, these indicate that the nonlinear odd power transformations of g is an invariance but the even power transformations reduce them back to the identity matrix. All these describe a static, stationary, and no growth universe. On the other hand, the power factors of a Hadamard matrix, H are H=4H, H=16H, H=64H, H=256H, H=4096H, and H=16384H. All these accelerated exponential growths imply the usefulness of Hadamard matrices for describing the accelerated expansion of spacetime and also simultaneously satisfy the missing mass principle using the general invariance of Hadamard matrices representing a no background spacetime quantum.


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