Journal
PHYSICAL REVIEW D
Volume 85, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.024040
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada
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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 L-1 = P and L-2 = -rho, which are equivalent for a perfect fluid, are not equivalent for a minimally coupled scalar field. The exchange L-1 <-> L-2 amounts to exchanging a canonical scalar field with a phantom scalar field.
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