{"id":139964,"date":"2022-05-30T03:02:56","date_gmt":"2022-05-30T08:02:56","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2022\/05\/symmetry-of-cosmological-observables-and-a-high-hubble-constant-as-an-indicator-of-a-mirror-world-dark-sector"},"modified":"2022-05-30T03:02:56","modified_gmt":"2022-05-30T08:02:56","slug":"symmetry-of-cosmological-observables-and-a-high-hubble-constant-as-an-indicator-of-a-mirror-world-dark-sector","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2022\/05\/symmetry-of-cosmological-observables-and-a-high-hubble-constant-as-an-indicator-of-a-mirror-world-dark-sector","title":{"rendered":"Symmetry of Cosmological Observables, and a High Hubble Constant as an Indicator of a Mirror World Dark Sector"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/symmetry-of-cosmological-observables-and-a-high-hubble-constant-as-an-indicator-of-a-mirror-world-dark-sector.jpg\"><\/a><\/p>\n<p>We find that a uniform scaling of the gravitational free-fall rates and photon-electron scattering rate leaves most dimensionless cosmological observables nearly invariant. This result opens up a new approach to reconciling cosmic microwave background and large-scale structure observations with high values of the Hubble constant $H_0$: Find a cosmological model in which the scaling transformation can be realized without violating any measurements of quantities not protected by the symmetry. A \u201cmirror world\u201d dark sector allows for effective scaling of the gravitational free-fall rates while respecting the measured mean photon density today. Further model building might bring consistency with the two constraints not yet satisfied: the inferred primordial abundances of deuterium and helium.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We find that a uniform scaling of the gravitational free-fall rates and photon-electron scattering rate leaves most dimensionless cosmological observables nearly invariant. This result opens up a new approach to reconciling cosmic microwave background and large-scale structure observations with high values of the Hubble constant $H_0$: Find a cosmological model in which the scaling transformation [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-139964","post","type-post","status-publish","format-standard","hentry","category-space"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/139964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=139964"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/139964\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=139964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=139964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=139964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}