An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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deceleration parameter
  پارامون ِ واشتاب  
pârâmun-e vâ&#353etâb
Fr.: paramètre de décéleration  

A parameter designating the rate at which the expansion of the Universe would slow down owing to the braking gravitational effect of the matter content of the Universe. It is expressed by:
q(t) = -R(t)R ..(t)/R .2(t), where R(t) represents the size of the Universe at time t. See also
→ expansion parameter; compare with → acceleration parameter.

See also: → deceleration;
→ parameter.