Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-01-07
Int. J. Mod. Phys. D. 20, 1689 (2011)
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
9 pages Revtex. Some changes in the Introduction to fit the version published in Int. J. Mod. Phys. D. Some typos corrected
Scientific paper
We identify the factors responsible for the appearance of energy-density inhomogeneities in a self-gravitating fluid, and describe the evolution of those factors from an initially homogeneous distribution. It is shown that a specific combination of the Weyl tensor and/or local anisotropy of pressure and/or dissipative fluxes entails the formation of energy-density inhomogeneities. Different cases are analyzed in detail and in the particular case of dissipative fluids, the role of relaxational processes as well as non-local effects are brought out.
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