MG15 - Talk detail |
Participant |
Wren, Andrew | |||||||
Institution |
None - - - - - - - United Kingdom | |||||||
Session |
DM4 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
A core-halo pattern of entropy creation in gravitational collapse | |||||
Coauthors | ||||||||
Abstract |
I present a kinetic theory model of gravitational collapse due to a small perturbation. Solving the relevant equations yields a pattern of entropy destruction in a spherical core around the perturbation, and entropy creation in a surrounding halo. This indicates collisional ``de-relaxation'' in the core, and collisional relaxation in the halo. Core-halo patterns are ubiquitous in the astrophysics of gravitational collapse, and are found here without any of the prior assumptions of such a pattern usually made in analytical models. Motivated by this analysis, the paper outlines a possible scheme for identifying structure formation in a set of observations or a simulation. This scheme involves a choice of coarse-graining scale appropriate to the structure under consideration, and might aid exploration of hierarchical structure formation, supplementing the usual density-based methods for highlighting astrophysical and cosmological structure at various scales. |
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