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Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 303 / 2 / b

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2024 iii Paper 303 2
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b
The free energy is dimensionless in units with kB​T=1, so the integrand has momentum dimension d. Since a derivative has dimension one, the kinetic term gives
2+2[ϕ]eng​=d,[ϕ]eng​=2d−2​​.
(1)
The mass term then gives
[μ02​]+2[ϕ]eng​=d,[μ02​]=2​.
(2)
These are engineering dimensions.

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