Spatially flat FLRW metric

In Cartesian comoving coordinates and signature

(-, +, +, +)

, a spatially flat FLRW universe has

d s^{2} = - c^{2} d t^{2} + a^{2} (t) (d x^{2} + d y^{2} + d z^{2}) .

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Past exam of the mathematics course of the University of Cambridge / 2015 / iii / Paper 55 / 1 / i / Solution
Past exam of the mathematics course of the University of Cambridge / 2015 / iii / Paper 55 / 2 / a / Solution
Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 310 / 1 / b / Solution
Past exam of the mathematics course of the University of Cambridge / 2023 / ii / Paper 4 / 37B / b / ii / Solution

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