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5. Introduction to Cosmology

Author

Valery A. Rubakov

Subjects
Physics, Inflation (cosmology), 010308 nuclear & particles physics, Equation of state (cosmology), Lambda-CDM model, 01 natural sciences, Cosmology, Physical cosmology, Thermodynamics of the universe, Classical mechanics, 0103 physical sciences, Dark energy, 010306 general physics, Dark fluid
Published
2005

6. On the global stability of gravitational lumps

Author

Cesar Gomez, F.Alexander Bais, and Valery A. Rubakov

Subjects
Physics, Gravitation, Nuclear and High Energy Physics, Theoretical physics, Classical mechanics, Cobordism, Fermion, Mathematics::Algebraic Topology, Stability (probability), General Theoretical Physics, Pontryagin's minimum principle
Abstract

The semi-classical stability of gravitational lumps is analyzed using cobordism theory. It turns out that not all topological numbers characterizing the lumps are conserved, in fact only the Pontryagin and Stiefel-Whitney numbers are. Some examples are given. Modifications due to the presence of fermions are briefly discussed.

Published
1987

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