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Conformal Transformations with Multiple Scalar Fields · Around

2010

Conformal Transformations with Multiple Scalar Fields

Kaiser, David I.

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Many interesting models incorporate scalar fields with non-minimal couplings to the spacetime Ricci curvature scalar.

As is well known, if only one scalar field is non-minimally coupled, then one may perform a conformal transformation to a new frame in which both the gravitational portion of the Lagrangian and the kinetic term for the (rescaled) scalar field assume canonical form.
We examine under what conditions the gravitational and kinetic terms in the Lagrangian may be brought into canonical form when more than one scalar field has non-minimal coupling.
A particular class of two-field models admits such a transformation, but models with more than two non-minimally coupled fields in general do not.

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