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Past exam of the mathematics course of the University of Cambridge / 2025 / iii / Paper 357 / 3 / d / i

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2025 iii Paper 357 3 d
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Solution

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i
In geodesic gauge,
α=1,βm=0,Dm​Dn​α=0.
(1)
The BSSN evolution equation reduces to
∂t​K=Amn​Amn+31​K2+4π(ρ+S).
(2)
The first term is a squared norm with respect to the positive-definite spatial metric, the second is nonnegative, and the stated energy condition makes the final term nonnegative. Therefore
∂t​K≥0​.
(3)
The mean curvature can only increase along this geodesic slicing.

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