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| rdfs | http://www.w3.org/2000/01/rdf-schema# |
| n2 | http://dbpedia.org/resource/Quintessence_(physics) |
| rdf | http://www.w3.org/1999/02/22-rdf-syntax-ns# |
| xsdh | http://www.w3.org/2001/XMLSchema# |
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In physics, quintessence is a hypothetical form of dark energy, more precisely a scalar field, postulated as an explanation of the observation of an accelerating rate of expansion of the universe announced in 1998, rather than due to a true cosmological constant. This scenario has been proposed first by Ratra and Peebles (1998).It has been proposed by some physicists to be a fifth fundamental force.