An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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density fluctuation
  افتاخیز ِ چگالی  
oftâxizhâ-ye cagâli
Fr.: fluctuations de densité  

In the early Universe, localized enhancements in the density of either matter alone or matter and radiation. According to models, very small initial fluctuations (less than 1 percent) can lead to subsequent formation of galaxies.

See also: → density; → fluctuation.