By applying the equivalence principle to the propagation of scalar waves in a curved spacetime, the value 1/6 for the coupling constant between the field and the Ricci scalar is derived. No coupling to higher-order scalars constructed from the Riemann tensor is allowed.
Coupling to the curvature for a scalar field from the equivalence principle
SONEGO, Sebastiano;
1993
Abstract
By applying the equivalence principle to the propagation of scalar waves in a curved spacetime, the value 1/6 for the coupling constant between the field and the Ricci scalar is derived. No coupling to higher-order scalars constructed from the Riemann tensor is allowed.File in questo prodotto:
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Coupling to the curvature for a scalar field from the equivalence principle.pdf
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