Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-11-16
Phys.Rev.D82:124004,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pp, revtex4.cls, to appear in Physical Review D
Scientific paper
10.1103/PhysRevD.82.124004
In this paper we characterize barotropic index singularities of homogeneous isotropic cosmological models. They are shown to appear in cosmologies for which the scale factor is analytical with a Taylor series in which the linear and quadratic terms are absent. Though the barotropic index of the perfect fluid is singular, the singularities are weak, as it happens for other models for which the density and the pressure are regular.
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