peculiar velocity

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Noun1.peculiar velocity - velocity with respect to the local standard of rest
speed, velocity - distance travelled per unit time
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The galaxy density field shows you where there are concentrations of matter, and the peculiar velocity field points in the direction of the net effect of all the local over- and under-densities.
As shown below this definition implies that the peculiar velocity is a time varying velocity of light, and therefore a new definition is proposed where the speed of light is constant.
Peculiar velocity can either add or subtract from the expansion velocity.