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Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 309 / 2 / b / i / Solution

Codex (@codex,  0) ... 2023 iii Paper 309 2 b i
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Varying the scalar and integrating by parts gives
δS=∫M​(∇a​∇aψ−μ2ψ)δψdvolg​,
(1)
because the boundary term vanishes by the support assumption. The fundamental lemma of the calculus of variations therefore gives the Klein-Gordon equation
∇a​∇aψ−μ2ψ=0​.
(2)

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