{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:RCUFMRJL47QJ43UMFXBZ27CHJI","short_pith_number":"pith:RCUFMRJL","canonical_record":{"source":{"id":"1709.09193","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-26T18:01:44Z","cross_cats_sorted":["astro-ph.CO","hep-ph","hep-th"],"title_canon_sha256":"9c0efdc1fb7821e86d4e05f33e470057699377d0bd2e8cc0e8b3ca9004746e98","abstract_canon_sha256":"900f7cc1a431ffebb96be26bb44d5acfe8c8e122dfa5907a752afab5efd2da5a"},"schema_version":"1.0"},"canonical_sha256":"88a856452be7e09e6e8c2dc39d7c474a277ca01d18c5fa80046e07a5c9272086","source":{"kind":"arxiv","id":"1709.09193","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.09193","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"1709.09193v4","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.09193","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"RCUFMRJL47QJ","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"RCUFMRJL47QJ43UM","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"RCUFMRJL","created_at":"2026-05-18T12:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:RCUFMRJL47QJ43UMFXBZ27CHJI","target":"record","payload":{"canonical_record":{"source":{"id":"1709.09193","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-26T18:01:44Z","cross_cats_sorted":["astro-ph.CO","hep-ph","hep-th"],"title_canon_sha256":"9c0efdc1fb7821e86d4e05f33e470057699377d0bd2e8cc0e8b3ca9004746e98","abstract_canon_sha256":"900f7cc1a431ffebb96be26bb44d5acfe8c8e122dfa5907a752afab5efd2da5a"},"schema_version":"1.0"},"canonical_sha256":"88a856452be7e09e6e8c2dc39d7c474a277ca01d18c5fa80046e07a5c9272086","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:03.329963Z","signature_b64":"nEFhoKYOy8ZHspnQyzh2r8kyORucDGAhv5RvXBfRe9IPysdHmpu5lEPn9p81mgmpy+6kIxc3HjrBDYrBaec2DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"88a856452be7e09e6e8c2dc39d7c474a277ca01d18c5fa80046e07a5c9272086","last_reissued_at":"2026-05-18T00:08:03.329497Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:03.329497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.09193","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5KiudSOn6LmxTog5VNhnzs2ojtjx6/gunL2wduAd71h2uXimLOqfnTIj14NAs6VkQIc1wuYdZWWVEwcQB2LyDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T20:53:08.422050Z"},"content_sha256":"a85a9fcbfe46d9a158a85b19abfec5e417419f30ef27e6619389563e3e4fbda6","schema_version":"1.0","event_id":"sha256:a85a9fcbfe46d9a158a85b19abfec5e417419f30ef27e6619389563e3e4fbda6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:RCUFMRJL47QJ43UMFXBZ27CHJI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New tracker models of dark energy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-ph","hep-th"],"primary_cat":"gr-qc","authors_text":"Satadru Bag, Swagat S. Mishra, Varun Sahni","submitted_at":"2017-09-26T18:01:44Z","abstract_excerpt":"We describe a new class of dark energy (DE) models which behave like cosmological trackers at early times. These models are based on the $\\alpha$-attractor set of potentials, originally discussed in the context of inflation. The new models allow the current acceleration of the universe to be reached from a wide class of initial conditions. Prominent examples of this class of models are the potentials $\\coth\\varphi$ and $\\cosh\\varphi$. A remarkable feature of this new class of models is that they lead to large enough negative values of the equation of state at the present epoch, consistent with"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.09193","kind":"arxiv","version":4},"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":"2026-05-18T00:08:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G8f2d8xs3xOBnEDoEig7KlAEs+ZCX8jzi35y6DAwe4fpR4gz6gNLqw4N6pY91NaCSOwdlATwRdu120EkeSCJBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T20:53:08.422404Z"},"content_sha256":"3e67f6e79aae29f6c48a363549a63bb3df9e302cbcb07efd4660455849b814ec","schema_version":"1.0","event_id":"sha256:3e67f6e79aae29f6c48a363549a63bb3df9e302cbcb07efd4660455849b814ec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/bundle.json","state_url":"https://pith.science/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/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":"2026-06-27T20:53:08Z","links":{"resolver":"https://pith.science/pith/RCUFMRJL47QJ43UMFXBZ27CHJI","bundle":"https://pith.science/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/bundle.json","state":"https://pith.science/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RCUFMRJL47QJ43UMFXBZ27CHJI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:RCUFMRJL47QJ43UMFXBZ27CHJI","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":"900f7cc1a431ffebb96be26bb44d5acfe8c8e122dfa5907a752afab5efd2da5a","cross_cats_sorted":["astro-ph.CO","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-26T18:01:44Z","title_canon_sha256":"9c0efdc1fb7821e86d4e05f33e470057699377d0bd2e8cc0e8b3ca9004746e98"},"schema_version":"1.0","source":{"id":"1709.09193","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.09193","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"arxiv_version","alias_value":"1709.09193v4","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.09193","created_at":"2026-05-18T00:08:03Z"},{"alias_kind":"pith_short_12","alias_value":"RCUFMRJL47QJ","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"RCUFMRJL47QJ43UM","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"RCUFMRJL","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:3e67f6e79aae29f6c48a363549a63bb3df9e302cbcb07efd4660455849b814ec","target":"graph","created_at":"2026-05-18T00:08:03Z","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 describe a new class of dark energy (DE) models which behave like cosmological trackers at early times. These models are based on the $\\alpha$-attractor set of potentials, originally discussed in the context of inflation. The new models allow the current acceleration of the universe to be reached from a wide class of initial conditions. Prominent examples of this class of models are the potentials $\\coth\\varphi$ and $\\cosh\\varphi$. A remarkable feature of this new class of models is that they lead to large enough negative values of the equation of state at the present epoch, consistent with","authors_text":"Satadru Bag, Swagat S. Mishra, Varun Sahni","cross_cats":["astro-ph.CO","hep-ph","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-26T18:01:44Z","title":"New tracker models of dark energy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.09193","kind":"arxiv","version":4},"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:a85a9fcbfe46d9a158a85b19abfec5e417419f30ef27e6619389563e3e4fbda6","target":"record","created_at":"2026-05-18T00:08:03Z","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":"900f7cc1a431ffebb96be26bb44d5acfe8c8e122dfa5907a752afab5efd2da5a","cross_cats_sorted":["astro-ph.CO","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-26T18:01:44Z","title_canon_sha256":"9c0efdc1fb7821e86d4e05f33e470057699377d0bd2e8cc0e8b3ca9004746e98"},"schema_version":"1.0","source":{"id":"1709.09193","kind":"arxiv","version":4}},"canonical_sha256":"88a856452be7e09e6e8c2dc39d7c474a277ca01d18c5fa80046e07a5c9272086","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"88a856452be7e09e6e8c2dc39d7c474a277ca01d18c5fa80046e07a5c9272086","first_computed_at":"2026-05-18T00:08:03.329497Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:03.329497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nEFhoKYOy8ZHspnQyzh2r8kyORucDGAhv5RvXBfRe9IPysdHmpu5lEPn9p81mgmpy+6kIxc3HjrBDYrBaec2DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:03.329963Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.09193","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a85a9fcbfe46d9a158a85b19abfec5e417419f30ef27e6619389563e3e4fbda6","sha256:3e67f6e79aae29f6c48a363549a63bb3df9e302cbcb07efd4660455849b814ec"],"state_sha256":"5804b9a895aef75a8b06dd31d4fc35f13fd4101d598b4009564d065b07f04b63"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n7TNoIQ2JGsRSmgDf/wDTzbsOlRE8eIGnbeTj9qHvGx50ussxpJ3ctXa2eZ5f9jBmXdxJJmj09AXYREG/b0ZBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T20:53:08.425217Z","bundle_sha256":"73b66a38a8742fa9252943ec055e6592fcd6f24881642e313876b54c67ca4e11"}}