Only Weak Gravity (1/3)
A potential that only applies to gravity not EM will have a diagonal field strength tensor.
- The sign of the spring constant k does not effect solving the field equations.
The sign of the spring constant k does change the derivative of the potential
to first order in k.
Therefore a potential that only has derivatives along the diagonal can be
constructed from two potentials that differ by string constants that either
constructively interfere to create a non-zero derivative, or destructively
interfere to eliminate a derivative.