Nordstrom theory of gravitation
= Nordstrom theory of gravitation
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{wiki=Nordström's_theory_of_gravitation}
Nordstrom's scalar theory restricts the spacetime metric to the conformally flat form $g_{\mu\nu}=\varphi^2\eta_{\mu\nu}$. Its null geodesics have the same unparametrized paths as those of the <Minkowski metric>, so the theory predicts no gravitational bending of light.