{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:CYTFZ2WCIUYALY5UNXOKJFY3TF","short_pith_number":"pith:CYTFZ2WC","canonical_record":{"source":{"id":"1701.01445","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-01-05T19:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"f7c5f70b016a84f8c69f8c4092fc004475075d023da1d72612600cfcf6110c56","abstract_canon_sha256":"9db7f6b651ceba1c7b760b7d6bb9710bef180161f7ae75d50ed95d7a9ae9c7e5"},"schema_version":"1.0"},"canonical_sha256":"16265ceac2453005e3b46ddca4971b99675d1601923d99c9a83c5379fdb5bf27","source":{"kind":"arxiv","id":"1701.01445","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.01445","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"arxiv_version","alias_value":"1701.01445v2","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.01445","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"pith_short_12","alias_value":"CYTFZ2WCIUYA","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"CYTFZ2WCIUYALY5U","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"CYTFZ2WC","created_at":"2026-05-18T12:31:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:CYTFZ2WCIUYALY5UNXOKJFY3TF","target":"record","payload":{"canonical_record":{"source":{"id":"1701.01445","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-01-05T19:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"f7c5f70b016a84f8c69f8c4092fc004475075d023da1d72612600cfcf6110c56","abstract_canon_sha256":"9db7f6b651ceba1c7b760b7d6bb9710bef180161f7ae75d50ed95d7a9ae9c7e5"},"schema_version":"1.0"},"canonical_sha256":"16265ceac2453005e3b46ddca4971b99675d1601923d99c9a83c5379fdb5bf27","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:15.479494Z","signature_b64":"Ps1t5eh/5YshlJhSSkYVLFJTDT6zq9RFu+ZkJFv8+my+iwGq/6edSoxBOfKSutNNzi/XuLkhJhpNjwpJW+zKBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"16265ceac2453005e3b46ddca4971b99675d1601923d99c9a83c5379fdb5bf27","last_reissued_at":"2026-05-18T00:48:15.478801Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:15.478801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.01445","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:48:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZN1drkZcvEIWhKtCeb5gh4sRvvhykvYKPVvTF+KEy9K3zSAD+KGwXOu5cLmAYx447VJh8xBWPVpfc9UhseYkBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T17:03:13.526818Z"},"content_sha256":"eb7ae0ea90e7ffdc98dd462d8594110b0ad630de9f395035aa7305287e7aabaf","schema_version":"1.0","event_id":"sha256:eb7ae0ea90e7ffdc98dd462d8594110b0ad630de9f395035aa7305287e7aabaf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:CYTFZ2WCIUYALY5UNXOKJFY3TF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"$\\Lambda$ is Coming: Parametrizing Freezing Fields","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Eric V. Linder","submitted_at":"2017-01-05T19:00:04Z","abstract_excerpt":"We explore freezing dark energy, where the evolution of the field approaches that of a cosmological constant at late times. We propose two general, two parameter forms to describe the class of freezing field models, in analogy to ones for thawing fields, here based on the physics of the flow parameter or the calibrated $w$-$w'$ phase space. Observables such as distances and Hubble parameters are fit to within 0.1%, and the dark energy equation of state generally to within better than 1%, of the exact numerical solutions."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.01445","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:48:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cl17nxTXxStYjPXc9jyo4wl9Y/IbGwX9wvWf7I63O9DNWF5rET1oUwo3ow8CTaZOh6Xwuud0P+FccNihrElrDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T17:03:13.527188Z"},"content_sha256":"008c08ea88463f4cf58ba6923429c7eb630c49f5cceebb0a62eebf272853a364","schema_version":"1.0","event_id":"sha256:008c08ea88463f4cf58ba6923429c7eb630c49f5cceebb0a62eebf272853a364"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/bundle.json","state_url":"https://pith.science/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T17:03:13Z","links":{"resolver":"https://pith.science/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF","bundle":"https://pith.science/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/bundle.json","state":"https://pith.science/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CYTFZ2WCIUYALY5UNXOKJFY3TF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:CYTFZ2WCIUYALY5UNXOKJFY3TF","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":"9db7f6b651ceba1c7b760b7d6bb9710bef180161f7ae75d50ed95d7a9ae9c7e5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-01-05T19:00:04Z","title_canon_sha256":"f7c5f70b016a84f8c69f8c4092fc004475075d023da1d72612600cfcf6110c56"},"schema_version":"1.0","source":{"id":"1701.01445","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.01445","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"arxiv_version","alias_value":"1701.01445v2","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.01445","created_at":"2026-05-18T00:48:15Z"},{"alias_kind":"pith_short_12","alias_value":"CYTFZ2WCIUYA","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"CYTFZ2WCIUYALY5U","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"CYTFZ2WC","created_at":"2026-05-18T12:31:10Z"}],"graph_snapshots":[{"event_id":"sha256:008c08ea88463f4cf58ba6923429c7eb630c49f5cceebb0a62eebf272853a364","target":"graph","created_at":"2026-05-18T00:48:15Z","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":"We explore freezing dark energy, where the evolution of the field approaches that of a cosmological constant at late times. We propose two general, two parameter forms to describe the class of freezing field models, in analogy to ones for thawing fields, here based on the physics of the flow parameter or the calibrated $w$-$w'$ phase space. Observables such as distances and Hubble parameters are fit to within 0.1%, and the dark energy equation of state generally to within better than 1%, of the exact numerical solutions.","authors_text":"Eric V. Linder","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-01-05T19:00:04Z","title":"$\\Lambda$ is Coming: Parametrizing Freezing Fields"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.01445","kind":"arxiv","version":2},"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:eb7ae0ea90e7ffdc98dd462d8594110b0ad630de9f395035aa7305287e7aabaf","target":"record","created_at":"2026-05-18T00:48:15Z","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":"9db7f6b651ceba1c7b760b7d6bb9710bef180161f7ae75d50ed95d7a9ae9c7e5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-01-05T19:00:04Z","title_canon_sha256":"f7c5f70b016a84f8c69f8c4092fc004475075d023da1d72612600cfcf6110c56"},"schema_version":"1.0","source":{"id":"1701.01445","kind":"arxiv","version":2}},"canonical_sha256":"16265ceac2453005e3b46ddca4971b99675d1601923d99c9a83c5379fdb5bf27","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"16265ceac2453005e3b46ddca4971b99675d1601923d99c9a83c5379fdb5bf27","first_computed_at":"2026-05-18T00:48:15.478801Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:15.478801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ps1t5eh/5YshlJhSSkYVLFJTDT6zq9RFu+ZkJFv8+my+iwGq/6edSoxBOfKSutNNzi/XuLkhJhpNjwpJW+zKBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:15.479494Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.01445","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb7ae0ea90e7ffdc98dd462d8594110b0ad630de9f395035aa7305287e7aabaf","sha256:008c08ea88463f4cf58ba6923429c7eb630c49f5cceebb0a62eebf272853a364"],"state_sha256":"32fb3593b49952510dd35603eca43c7e5760cd86629bcfa59e7ecac4881fbbfb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uAOCxNXwJfdz0CQROkHuqAu9nZRtqbb/5ccaZxs8GhXcLVKTB/iBmYoCQiQzYbcuOxdop1d1pzLVqE1+5zz5Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T17:03:13.529018Z","bundle_sha256":"937cf68635d6c43ef8ba0cc669fcfb884a218c7e4def24c548d381542e0692b2"}}