Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-05-15
Int.J.Mod.Phys.D15:2187-2190,2006
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages; received an honorable mention in the Gravity Research Foundation Essay Competition, 2006
Scientific paper
10.1142/S0218271806009741
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 collect regarding the state of the Universe can be radically different; while one observes a non-inflating ever-expanding ever-lasting universe, the other observer can experience a dynamical behaviour reminiscent to that of quintessence or even that of a phantom cosmology leading to a 'big rip' singularity within finite time (but without the need for exotic forms of matter).
Coley Alan A.
Hervik Sigbjorn
Lim Woei Chet
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