MG14 - Talk detail |
Participant |
Ostrowski, Jan | |||||||
Institution |
Nicolaus Copernicus University - Gagarina 11 - Torun - Kujawsko-Pomorskie - Poland | |||||||
Session |
DE3 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
On the relativistic Zel'dovich approximation and averaging problem in cosmology | |||||
Coauthors | ||||||||
Abstract |
The relativistic analogue of the widely used Zel'dovich approximation that has been developed by Buchert et al is potentially a very powerful tool for investigating large scale structure formation in the language of general relativity. Expressing the Einstein equation in a synchronous gauge with only one variable object - the Cartan coframe - allows us to construct a relativistic analogy of the classical Zel'dovich approximation by choosing a specific, perturbative form of the geodesic followed by a fluid element. This assumed form of the Cartan coframe is then put into the Einstein equations, and without any further truncations or linearizations, is used to recover non-linear aspects of structure formation with a very small set of assumptions. In particular, the Relativistic Zel'dovich Approximation (RZA) can serve as a closure condition for generalized Friedman equations, provided that a suitable choice of background model has been made. Some applications to cosmological mass function theory will be presented. |
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Pdf file |
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Session |
DE2 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
On the Green and Wald formalism | |||||
Coauthors | ||||||||
Abstract |
Brief discussion on the debate with Green and Wald regarding the influence of the density inhomogeneities on the large scale dynamics will be presented |
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Pdf file |
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