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### What is overdensity in the cosmology ??

Posted: December 22 2013
What is overdensity in the cosmology ??

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### What is overdensity in the cosmology ??

Posted: February 28 2016
Typically in cosmology, overdensity refers to the deviation of the density at a point from the average density:

$$\delta(x) = \frac{\rho(x) - \bar{\rho}}{\bar{\rho}}$$