Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1999-05-13
Gen.Rel.Grav. 29 (1997) 275
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
LaTex file, 14 pages
Scientific paper
In the context of higher-dimensional cosmologies with isotropic visible and internal space and multi-perfect fluid matter, we study the conditions under which adiabatic expansion of the visoble external space is possible, when a time-dependent internal space is present. The analysis is based on a reinterpretation of the four-dimensional stress-energy tensor in the presence of the extra dimensions. This modifies the usual adiabatic energy conservation laws for the visible Universe, leading to a new type of cosmological evolution which includes large-scale entropy production in four dimensions.
Kleidis Kostas
Papadopoulos Demetrios B.
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