{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:6LTKBJ2RDYTBQCWLRLJ4IZJY6G","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ed0e62a00386ac472d9d171e213f53983a56d4dd0c98f048cd322efe14967402","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-04-01T15:10:06Z","title_canon_sha256":"dfd7c6aeb1e090b14e19ed0fe42d96669bba1cb2a8b6e3bb3d27f1b9425f92b7"},"schema_version":"1.0","source":{"id":"1504.00259","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00259","created_at":"2026-05-18T01:16:50Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00259v1","created_at":"2026-05-18T01:16:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00259","created_at":"2026-05-18T01:16:50Z"},{"alias_kind":"pith_short_12","alias_value":"6LTKBJ2RDYTB","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6LTKBJ2RDYTBQCWL","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6LTKBJ2R","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:039c2d70cab0f3a0f74a54dc81b3a47db3406886926895149faa80725702091d","target":"graph","created_at":"2026-05-18T01:16:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The insulator-metal transition in hydrogen is one of the most outstanding problems in condensed matter physics. The high-pressure metallic phase is now predicted to be liquid atomic from T=0 K to very high temperatures. We have conducted measurements of optical properties of hot dense hydrogen in the region of 1.1-1.7 Mbar and up to 2200 K. We observe a first-order phase transition accompanied by changes in transmittance and reflectance characteristic of a metal. The phase line of this transition has a negative slope in agreement with theories of the so-called plasma phase transition.","authors_text":"Ashkan Salamat, Isaac F. Silvera, Mohamed Zaghoo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-04-01T15:10:06Z","title":"A First-order Phase Transition to Metallic Hydrogen"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00259","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1d1c6ddaa098f8d580676fc216a0f382e5f19544b4395ce61a9c9d52b23e7bd4","target":"record","created_at":"2026-05-18T01:16:50Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ed0e62a00386ac472d9d171e213f53983a56d4dd0c98f048cd322efe14967402","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-04-01T15:10:06Z","title_canon_sha256":"dfd7c6aeb1e090b14e19ed0fe42d96669bba1cb2a8b6e3bb3d27f1b9425f92b7"},"schema_version":"1.0","source":{"id":"1504.00259","kind":"arxiv","version":1}},"canonical_sha256":"f2e6a0a7511e26180acb8ad3c46538f18489f542247d2e162ad17b5d9a3e9ec4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f2e6a0a7511e26180acb8ad3c46538f18489f542247d2e162ad17b5d9a3e9ec4","first_computed_at":"2026-05-18T01:16:50.996302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:50.996302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wGGn2SbyIi2MSDvS3b6014B282c7UoIo3S48BUSGhpNhvQB45s0HowfwtEwINQ4phqGApr3Sm12MCCa+XzAcBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:50.997108Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.00259","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d1c6ddaa098f8d580676fc216a0f382e5f19544b4395ce61a9c9d52b23e7bd4","sha256:039c2d70cab0f3a0f74a54dc81b3a47db3406886926895149faa80725702091d"],"state_sha256":"4fa4d9955f262ac793c99a0effd52c577128d02fea31143e749771fbf9b77080"}