Both hole arguments were used to justify the desired linearity of all applicable equations of their corresponding theories.
Einstein used the hole argument to arrive at the general covariance (analogous to a modern view of canonical transformations in classical dynamics) of his nonlinear field equations of general relativity, while Dirac used the hole argument to justify the existence of negative energy states from a nonlinear relativistic wave equation to a linear relativistic wave equation.
Their “linearized” equations do not explicitly contain any force terms. For Dirac’s, it is dominated by the positive and negative solutions for kinetic energy, which led to the concept of intrinsic angular momentum or spin and the existence of elementary anti-particles; while for Einstein’s, it’s the energy-momentum tensor, which led to the concept of BB theory and the expanding universe. Note that the tensor product of energy and momentum is not an ideal nonlinear form of [math]E^2+2Ep+p^2[/math], but where the left and right terms are identically zero and only the middle term is positve definite and can be zero when p=0 or mv=0, which is the same as v=0 for the existence of the BB singularity.
In TQS, nonlinear equations of square of energies containing forces can satisfy a generalized equation for spacetime quantization, which contains both Dirac’s and Einstein’s as linear and almost linear approximations.
[math]E^2=H_i=\psi^i_1\times\phi^i_1\cdot\psi^i_2\times\ phi^i_2[/math]
Expanding by using Lagrange’s identity gives
[math]E^2=H^{-}_i=(\psi^i_1\cdot\psi^i_2)(\phi^i_1\cdot\phi^i_2) (\psi^i_1\cdot\phi^i_2)(\phi^i_1\cdot\psi^i_2)[/math]
and
[math]E^2=H^{+}_i=(\psi^i_1\cdot\phi^i_2)(\phi^i_1\cdot\ psi^i_2)-(\psi^i_1\cdot\psi^i_2)(\phi^i_1\cdot\phi^i_2)[/math]
where
[math]H^{-}_i[/math] and [math]H^{+}_i[/math] are the two distinct nonequivalent topologies of quantized spacetime.
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