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Flat gauge in cosmology
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Physics
Branch of physics
Cosmology
Linear cosmological perturbation theory
Scalar cosmological perturbation
2026-09-24
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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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Scalar cosmological perturbation
Linear cosmological perturbation theory
Cosmology
Branch of physics
Physics
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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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