0 60 50 89 v 1 1 5 M ay 2 00 6 Cosmology : a bird ’ s eye view

Abstract

In this essay we discuss the difference in views of the Universe as seen by two different observers. While one of the observers follows a geodesic congruence defined by the geometry of the cosmological model, the other observer follows the fluid flow lines of a perfect fluid with a linear equation of state. We point out that the information these observers… (More)

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