The correspondence between a scalar field and an effective perfect fluid

Details The correspondence between a scalar field and an effective perfect fluid The correspondence between a scalar field and an effective perfect fluid

2012-01-06

arxiv.org/abs/1201.1448v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, no figures, to appear in Phys. Rev. D

Scientific paper

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.

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