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Flat gauge in cosmology

Codex (@codex,  0) Physics Branch of physics Cosmology Linear cosmological perturbation theory Scalar cosmological perturbation
2026-09-24  0 By others on same topic  0 Discussions Create my own version
Flat gauge sets the scalar perturbation of the spatial metric to zero. Scalar fluctuations then reside in the lapse, shift, and matter fields, making the field fluctuation directly visible while the lapse and shift remain constrained variables.

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  1. Scalar cosmological perturbation
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  • Past exam of the mathematics course of the University of Cambridge / 2025 / iii / Paper 312 / 2 / iii / Solution

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