Several colleagues have helped us develop our understanding of relativistic fluid dynamics. We are particularly indebted to Brandon Carter, David Langlois, Reinhard Prix, and Bernard Schutz.
NA acknowledges support from PPARC via grant no. PPA/G/S/2002/00038 and Senior Research Fellowship no. PP/C505791/1. GLC acknowledges support from NSF grant no. PHY-0457072.
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