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Coarse-graining of inhomogeneous dust flow in General Relativity via isometric embeddings

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons20690

Korzynski,  Mikolaj
Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Volltexte (frei zugänglich)

1001.2031
(Preprint), 188KB

AIPConf1241.pdf
(beliebiger Volltext), 155KB

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Zitation

Korzynski, M. (2010). Coarse-graining of inhomogeneous dust flow in General Relativity via isometric embeddings. AIP Conference Proceedings, 1241, 973-980.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0012-69D1-B
Zusammenfassung
We present a new approach to coarse-graining of variables describing dust flow in GR. It is based on assigning quasi-local shear, twist and expansion to 2-dimensional surfaces with the help of isometric embeddings into the 3-dimensional Euclidean space and deriving the time evolution equations for them. In contrast to the popular Buchert's scheme it allows to coarse-grain tensorial quantities in a coordinate-independent way. The framework can be used to estimate backreaction in inhomogeneous cosmological models.