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Einstein frame or Jordan frame ?

Valerio Faraoni, Edgard Gunzig

astro-pharXiv:astro-ph/9910176

Abstract

Scalar-tensor theories of gravity can be formulated in the Jordan or in the Einstein frame, which are conformally related. The issue of which conformal frame is physical is a contentious one; we provide a straightforward example based on gravitational waves in order to clarify the issue.

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