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Linear cosmological density perturbation

Matter-era growing and decaying density modes

After neglecting the decaying mode, the linear growth between conformal times $\tau_1$ and $\tau_2$ is
$$
D(\tau_2,\tau_1)=\frac{a(\tau_2)}{a(\tau_1)}
=\left(\frac{\tau_2}{\tau_1}\right)^2.
$$


Matter-era linear growth factor

Past exam of the mathematics course of the University of Cambridge / 2008 / iii / Paper 62 / 4 / e / Solution

Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 48 / 3 / c / Solution

Matter-era linear growth factor

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Matter-era linear growth factor

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