{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"5ed6363bea7d78c57b7ff103ac3abf4657c32aae98e626fea98c2a0fb943486e","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"fafc3e87aef3fa244536c6721e9c828e5d40b738ba09dceed08f64413be8596a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"cosmo.dark-energy","field":"cosmo","n":"1","review_cite":"Weinberg S., The cosmological constant problem, Reviews of Modern Physics, 1989","review_link":"https://doi.org/10.1103/RevModPhys.61.1","review_verified":"true","summary":"The expansion of the universe has been speeding up for several billion years, as if empty space carries an energy that pushes outward. Simple estimates from quantum theory give a vacuum energy enormously larger than the value observed, and recent surveys hint that the dark energy may change with time.","title":"Dark energy and the cosmological constant","topic_ref":null,"why":"Dark energy is about 70 percent of the energy density of the universe, and its tiny value is one of the largest quantitative mismatches between theory and observation in physics."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b5d1beeb857272a00ddef0d96d0dc942604643076d1e11010fb95e0050582325","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"38315708eda1cf58543d455562e0651a53f436cb48b731e9e25b7c9393e9d15d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"j-29K5hhUj6n51bFf96CU7o9AsOYei_v7LbINNqHZpILsz1fTGzJxY7vbjiwoD5SgVUNP5fbiGP9znSnlVkgCw"},"schema":"pubphys.envelope/1"},"record_hash":"b5d1beeb857272a00ddef0d96d0dc942604643076d1e11010fb95e0050582325","leaf_index":185}