MG14 - Talk detail |
Participant |
Bishop, Nigel | |||||||
Institution |
Rhodes University - Lucas Avenue - Grahamstown - Eastern Cape - South Africa | |||||||
Session |
DE2 |
Accepted |
Yes |
Order |
9 |
Time |
17:10 | 20' |
Talk |
Oral abstract |
Title |
The Characteristic Formalism: Cosmology Constructed from Observational Data | |||||
Coauthors | Bester, Landman; Larena, Julien | |||||||
Abstract |
The characteristic formalism uses outgoing null cones to define coordinates, and is well-developed in numerical relativity for gravitational wave extraction. The formalism is well-suited to cosmology, since cosmological data is observed on past null cones. In the case of spherical symmetry, density and radial velocity data on an initial null cone define a well-posed evolution problem leading to the past behaviour of the universe. Observationally, the data can be obatined from galactic number counts or age data, and the distance red-shift relation. When red-shift drift data becomes available, constraints on the theory of gravity, such as the cosmological constant, will become feasible. |
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Pdf file |
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