The methods of gluing manifolds in general relativity

Details The methods of gluing manifolds in general relativity The methods of gluing manifolds in general relativity

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jmp....43.1519n&link_type=abstract

Journal of Mathematical Physics, Volume 43, Issue 3, pp. 1519-1535 (2002).

Mathematics

Mathematical Physics

3

Fundamental Problems And General Formalism, Relativity And Gravitation, Manifolds And Cell Complexes, Partial Differential Equations

Scientific paper

Some areas of modern theoretical physics such as modern cosmology contain different manifolds which must be glued together along a common boundary. These boundaries can be spacelike, timelike, or lightlike hypersurfaces. This paper shows how this gluing for different hypersurfaces is possible. Two different approaches are considered and the extent to which these approaches are equivalent are discussed. In particular, we will construct a distributional approach for dynamics of lightlike hypersurfaces in general relativity. Since Einstein's equations are nonlinear PDEs, for discontinuous metrics such as signature changing metrics, product of distributions are unavoidable. To glue two different manifolds which admit signature change, we consider this problem in the context of Colombeau's new theory of generalized functions. Some examples are given for clarification.

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