An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 2 Search : Hubble parameter
Hubble parameter
  پارامون ِ هابل   
pârânmun-e Hubble

Fr.: paramètre de Hubble   

The rate pf change of the → cosmic scale factor: H(t) = (dR/dt)/R. The Hubble parameter is a time-dependent quantity and therefore is not constant. The → Hubble constant is the Hubble parameter measured today.

Hubble; → parameter.

normalized Hubble parameter
  پارامون ِ هابل ِ هنجاروریده   
pârâmun-e Hubble-e hanjârvaridé

Fr.: paramètre Hubble normalisé   

A dimensionless parameter expressed by h(z) = H(z)/H0, where H(z) is the → Hubble parameter at → redshift z and H0 is the → Hubble constant.

normalized; → Hubble; → parameter.