104 citations · 106 across the 2 of their papers we have counts for
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gr-qc2007★ 104 cited
Causality and the speed of sound
George Ellis, Roy Maartens, Malcolm MacCallum
A usual causal requirement on a viable theory of matter is that the speed of sound be at most the speed of light. In view of various recent papers querying this limit, the question…
gr-qc2005★ 2 cited
Second order perturbations of rotating bodies in equilibrium; the exterior vacuum problem
Malcolm A. H. MacCallum, Marc Mars, Raul Vera
We study the exterior vacuum problem for first and second order stationary and axially symmetric perturbations of static bodies. The boundary conditions and their compatibility for…