{"id":28286,"date":"2026-05-03T09:59:00","date_gmt":"2026-05-03T07:59:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=28286"},"modified":"2026-05-11T10:29:11","modified_gmt":"2026-05-11T08:29:11","slug":"entretien-la-nature-de-lenergie-noire-reste-une-grande-question-de-la-cosmologie","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/05\/03\/entretien-la-nature-de-lenergie-noire-reste-une-grande-question-de-la-cosmologie\/","title":{"rendered":"[Entretien] \u00ab&nbsp;La nature de l\u2019\u00e9nergie noire reste une grande question de la cosmologie&nbsp;\u00bb"},"content":{"rendered":"<div class=\"paragraph\">\n<p><b>La Marseillaise :<\/b><b> Vous travaillez sur les donn\u00e9es fournies par le t\u00e9lescope Euclid, mis en orbite en 2023. En quoi cela consiste-t-il ?<\/b><\/p>\n<p><b>Pauline Vielzeuf :<\/b> Nous travaillons sur les donn\u00e9es r\u00e9colt\u00e9es pendant la premi\u00e8re ann\u00e9e d\u2019observation. Nous avons un catalogue de galaxies, avec leur position en trois dimensions et nous identifions les endroits o\u00f9 il y en a tr\u00e8s peu : les vides cosmiques. Quand nous aurons des catalogues de vides, nous pourrons faire de l\u2019analyse cosmologique et tenter de comprendre ce qu\u2019est l\u2019\u00e9nergie noire.<\/p>\n<p><b>Qu\u2019essaye-t-on de comprendre \u00e0 son sujet ? <\/b><\/p>\n<p><b>P.V. :<\/b> Sa nature. Cela reste une des grandes questions de la cosmologie. Pour l\u2019instant, son existence est suppos\u00e9e pour expliquer l\u2019expansion acc\u00e9l\u00e9r\u00e9e de l\u2019Univers mais nous ne savons pas d\u2019o\u00f9 elle vient. Il y a plusieurs hypoth\u00e8ses. Cela pourrait \u00eatre une constante -c\u2019est comme \u00e7a et nous ne savons pas l\u2019expliquer-, ou \u00eatre caus\u00e9 par un fluide que nous n\u2019arrivons pas \u00e0 d\u00e9tecter. Cela pourrait aussi \u00eatre un probl\u00e8me avec la th\u00e9orie de la relativit\u00e9 g\u00e9n\u00e9rale qui devrait \u00eatre corrig\u00e9e \u00e0 certaines \u00e9chelles.<\/p>\n<p><b>L\u2019an dernier, la collaboration Desi a publi\u00e9 des premiers r\u00e9sultats semblant montrer que l\u2019\u00e9nergie noire ne serait pas une constante&#8230;<\/b><\/p>\n<p><b>P.V. :<\/b> Effectivement. Si c\u2019\u00e9tait confirm\u00e9, cela remettrait en question ce que l\u2019on consid\u00e8re depuis des d\u00e9cennies. Mais si nous consid\u00e9rions que l\u2019\u00e9nergie noire \u00e9tait une constante, c\u2019est parce que nos mesures n\u2019\u00e9taient pas assez pr\u00e9cises. C\u2019est en train de changer. Et avec Euclid, nous essayerons de pr\u00e9ciser cette variation.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"La Marseillaise : Vous travaillez sur les donn&eacute;es fournies par le t&eacute;lescope Euclid, mis en orbite en 2023. En quoi cela consiste-t-il ?Pauline Vielzeuf : Nous travaillons sur les donn&eacute;es r&eacute;colt&eacute;es pendant la &#8230;","protected":false},"author":1,"featured_media":28288,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3926,3925,20],"tags":[10,1687,5462,16,938,946,1946,1592,164,1058,988,2001],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-28286","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil-merge","category-accueil-third","category-societe","tag-bouches-du-rhone","tag-chercheurs","tag-cosmologie","tag-marseille","tag-nature","tag-physique","tag-questions","tag-recherche","tag-resultats","tag-science","tag-week-end","tag-weekend","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/28286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=28286"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/28286\/revisions"}],"predecessor-version":[{"id":28289,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/28286\/revisions\/28289"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/28288"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=28286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=28286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=28286"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=28286"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=28286"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=28286"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=28286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}