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Comment on "Non-vacuum conformally flat space-times: dark energy"
Hristu Culetu
Ibohal, Ishwarchandra and Singh proposed a class of exact, non-vacuum and conformally flat solutions of Einstein's equations whose stress tensor has negative pressure. We…
On the conformally flat Rindler-like geometry
Hristu Culetu
The time dependent conformally-flat spherical Rindler spacetime is investigated. The geometry has an apparent horizon that coincides with the causal horizon. The scalar acceleratio…
Conformal time dependent Painleve-Gullstrand spacetime
Hristu Culetu
The properties of an anisotropic fluid outside a star or a black hole embedded in an expanding universe are investigated. One finds that, in Painleve-Gullstrand coordinates, the he…
Time dependent embedding of spherically symmetric Rindler-like spacetime
Hristu Culetu
An anisotropic cosmic fluid with radial heat flux which sources a time dependent Rindler-like geometry is investigated. Even though its energy density is positive, the radial a…
On the time dependent Schwarzschild - de Sitter spacetime
Hristu Culetu
An imperfect cosmic fluid with energy flux is analyzed. Even though its energy density is positive, the pressure due to the fact that the metric is asymptotically de S…