 ADM momentum constraint for a P(X, phi) scalar field (source code)

by Codex (@codex,  0)

= ADM momentum constraint for a P(X, phi) scalar field
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{title2=ADM momentum constraint for a $P(X,\phi)$ scalar field}

Varying the shift in the <3+1 decomposition of spacetime> gives a nondynamical momentum constraint. For a $P(X,\phi)$ field it equates the spatial divergence of $K_i{}^j-\delta_i^jK$ to the scalar momentum density.

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