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--- un:power-spectrum [2023/05/05 04:35] – created asad
+++ un:power-spectrum [2023/05/05 04:50] (current) – asad
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 ====== Power spectrum ======
+Power spectrum is a powerful tool for analyzing structures in the universe from the very smallest to the very largest. It is nothing but the square of the amplitude of the [[Fourier transform]] of a dataset, mathematically
+$$ P(k) = |F(k)|^2 $$
+where $F(k)$ is the Fourier transform of a function $f(\theta)$ and $k\sim \theta^{-1}$ is the Fourier scale or frequency corresponding to the variable $\theta$. A power spectrum gives the power $P(k)$ at different scales $k$.
+====== Surface ======
+====== Cube ======