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Title: What is dust? - Physical foundations of the averaging problem in cosmology
Authors: Wiltshire, D.L.
Keywords: gravitation
particle theory
field-theory models
Issue Date: 2011
Citation: Wiltshire, D.L. (2011) What is dust? - Physical foundations of the averaging problem in cosmology. Classical and Quantum Gravity, 28, pp. 164006.
Source: http://dx.doi.org/10.1088/0264-9381/28/16/164006
Abstract: The problems of coarse-graining and averaging of inhomogeneous cosmologies, and their backreaction on average cosmic evolution, are reviewed from a physical viewpoint. A particular focus is placed on comparing different notions of average spatial homogeneity, and on the interpretation of observational results. Among the physical questions we consider are: the nature of an average Copernican principle, the role ofMach’s principle, the issue of quasilocal gravitational energy and the different roles of spacetime, spatial and null cone averages. The observational interpretation of the timescape scenario is compared to other approaches to cosmological averaging, and outstanding questions are discussed.
Publisher: University of Canterbury. Physics and Astronomy
Research Fields: Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020103 - Cosmology and Extragalactic Astronomy
Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020105 - General Relativity and Gravitational Waves
URI: http://hdl.handle.net/10092/7100
Rights URI: http://library.canterbury.ac.nz/ir/rights.shtml
Appears in Collections:Science: Journal Articles

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