{"id":"https://openalex.org/keywords/hubble-parameter","display_name":"Hubble parameter","description":"The Hubble parameter is a cosmological quantity describing the universe's expansion rate as a function of time.","display_name_alternatives":["time-dependent Hubble parameter","cosmic expansion rate","cosmological expansion rate","expansion rate of the universe","Hubble expansion parameter","Hubble rate"],"ids":{"openalex":"https://openalex.org/keywords/hubble-parameter","wikidata":"https://www.wikidata.org/wiki/Q91726935"},"primary_topic":{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.8664,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.8664,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"works_count":6479,"cited_by_count":144402,"works_api_url":"https://api.openalex.org/works?filter=keywords.id:keywords/hubble-parameter","updated_date":"2026-10-19T04:06:21","created_date":"2026-09-30T00:00:00"}
