Relaxational effects in radiating stellar collapse |
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| Authors: | Megan Govender Roy Maartens Sunil D Maharaj |
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| Institution: | Department of Physics, Technikon Natal, PO Box 953, Durban 4000, South Africa; School of Computer Science and Mathematics, Portsmouth University, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG; Department of Mathematics, University of Natal, Durban 4041, South Africa |
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| Abstract: | Relaxational effects in stellar heat transport can in many cases be significant. Relativistic Fourier–Eckart theory is inherently quasi-stationary, and cannot incorporate these effects. The effects are naturally accounted for in causal relativistic thermodynamics, which provides an improved approximation to kinetic theory. Recent results, based on perturbations of a static star, show that relaxation effects can produce a significant increase in the central temperature and temperature gradient for a given luminosity. We use a simple stellar model that allows for non-perturbative deviations from staticity, and confirms qualitatively the predictions of the perturbative models. |
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| Keywords: | hydrodynamics radiation mechanisms: thermal relativity |
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