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2012

The correspondence between a scalar field and an effective perfect fluid

Faraoni, Valerio

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It is widely acknowledged that, for formal purposes, a minimally coupled scalar field is equivalent to an effective perfect fluid with equation of state determined by the scalar potential.

This correspondence is not complete because the Lagrangian densities P and -rho, which are equivalent for a perfect fluid, are not equivalent for a minimally coupled scalar field.
The exchange between these two Lagrangian densities amounts to exchanging a canonical scalar field with a phantom scalar field.

The correspondence between a scalar field and an effective perfect fluid · Around

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