{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:C2DEL2DJZAL2MJPXG65CIPXPAN","short_pith_number":"pith:C2DEL2DJ","canonical_record":{"source":{"id":"2502.02420","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-04T15:41:55Z","cross_cats_sorted":["astro-ph.CO","gr-qc"],"title_canon_sha256":"d5fec58cdcad447ee1e4105c35bd9db91bebe592837fed84f75475b24ca63d3f","abstract_canon_sha256":"3b15757de0510e23b48599f75211b9acae7f48f8bebd64d45ef31ccad92362ac"},"schema_version":"1.0"},"canonical_sha256":"168645e869c817a625f737ba243eef0377ea78da3945686506eab2eb4edc9dc6","source":{"kind":"arxiv","id":"2502.02420","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.02420","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"arxiv_version","alias_value":"2502.02420v1","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.02420","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_12","alias_value":"C2DEL2DJZAL2","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_16","alias_value":"C2DEL2DJZAL2MJPX","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_8","alias_value":"C2DEL2DJ","created_at":"2026-07-05T10:09:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:C2DEL2DJZAL2MJPXG65CIPXPAN","target":"record","payload":{"canonical_record":{"source":{"id":"2502.02420","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-04T15:41:55Z","cross_cats_sorted":["astro-ph.CO","gr-qc"],"title_canon_sha256":"d5fec58cdcad447ee1e4105c35bd9db91bebe592837fed84f75475b24ca63d3f","abstract_canon_sha256":"3b15757de0510e23b48599f75211b9acae7f48f8bebd64d45ef31ccad92362ac"},"schema_version":"1.0"},"canonical_sha256":"168645e869c817a625f737ba243eef0377ea78da3945686506eab2eb4edc9dc6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:09:28.476441Z","signature_b64":"2eriHT9Pxozxbc95Uj49soIC09qOzDOTz/X23NAhVS7CnDg+FVpbZ3/ievvGVEYRstVQ1Iadtx1KQVO9clBgBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"168645e869c817a625f737ba243eef0377ea78da3945686506eab2eb4edc9dc6","last_reissued_at":"2026-07-05T10:09:28.476029Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:09:28.476029Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.02420","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:09:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a/YQqxgwqEMAC5lM/DYUIkQjX7dbTTQdQNlesUKSG/7Q5CQl9sQiu23tePf9JCso985dSseM4msPhlDwvb46Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T21:35:04.416270Z"},"content_sha256":"cfc8d59614c47a49c3639c67f262e26d739c8bd84e1e996b5893cc51eb85c56c","schema_version":"1.0","event_id":"sha256:cfc8d59614c47a49c3639c67f262e26d739c8bd84e1e996b5893cc51eb85c56c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:C2DEL2DJZAL2MJPXG65CIPXPAN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraints on minimally and conformally coupled ultralight dark matter with the EPTA","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Clemente Smarra","submitted_at":"2025-02-04T15:41:55Z","abstract_excerpt":"Millisecond pulsars are extremely stable natural timekeepers. Pulsar Timing Array experiments, tracking subtle changes in the pulsars' rotation periods, can shed light on the presence of ultralight particles in our Galaxy. In this conference paper, we start by reviewing the most conservative scenario, in which ultralight particles interact only gravitationally. In this setting, we show that Pulsar Timing Arrays are able to constrain the presence of ultralight fields up to a few tenths of the observed dark matter abundance. Then, we consider conformally coupled ultralight candidates, demonstrat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.02420","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2502.02420/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T10:09:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6TN2kaGPKG8vsPygbGpkdO4QsLjnf5s05SjUHLF6lPoNnR9hkkbQ1fWPab6lWCnIjOXGEXBllwDDOjHt8Y6ZDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T21:35:04.416818Z"},"content_sha256":"378c7d88824f48cf86bc8085f3ef87d83668cdaa8483e109c17d1d33afd2e430","schema_version":"1.0","event_id":"sha256:378c7d88824f48cf86bc8085f3ef87d83668cdaa8483e109c17d1d33afd2e430"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/bundle.json","state_url":"https://pith.science/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/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":"2026-08-10T21:35:04Z","links":{"resolver":"https://pith.science/pith/C2DEL2DJZAL2MJPXG65CIPXPAN","bundle":"https://pith.science/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/bundle.json","state":"https://pith.science/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C2DEL2DJZAL2MJPXG65CIPXPAN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:C2DEL2DJZAL2MJPXG65CIPXPAN","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":"3b15757de0510e23b48599f75211b9acae7f48f8bebd64d45ef31ccad92362ac","cross_cats_sorted":["astro-ph.CO","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-04T15:41:55Z","title_canon_sha256":"d5fec58cdcad447ee1e4105c35bd9db91bebe592837fed84f75475b24ca63d3f"},"schema_version":"1.0","source":{"id":"2502.02420","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.02420","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"arxiv_version","alias_value":"2502.02420v1","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.02420","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_12","alias_value":"C2DEL2DJZAL2","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_16","alias_value":"C2DEL2DJZAL2MJPX","created_at":"2026-07-05T10:09:28Z"},{"alias_kind":"pith_short_8","alias_value":"C2DEL2DJ","created_at":"2026-07-05T10:09:28Z"}],"graph_snapshots":[{"event_id":"sha256:378c7d88824f48cf86bc8085f3ef87d83668cdaa8483e109c17d1d33afd2e430","target":"graph","created_at":"2026-07-05T10:09:28Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2502.02420/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Millisecond pulsars are extremely stable natural timekeepers. Pulsar Timing Array experiments, tracking subtle changes in the pulsars' rotation periods, can shed light on the presence of ultralight particles in our Galaxy. In this conference paper, we start by reviewing the most conservative scenario, in which ultralight particles interact only gravitationally. In this setting, we show that Pulsar Timing Arrays are able to constrain the presence of ultralight fields up to a few tenths of the observed dark matter abundance. Then, we consider conformally coupled ultralight candidates, demonstrat","authors_text":"Clemente Smarra","cross_cats":["astro-ph.CO","gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-04T15:41:55Z","title":"Constraints on minimally and conformally coupled ultralight dark matter with the EPTA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.02420","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:cfc8d59614c47a49c3639c67f262e26d739c8bd84e1e996b5893cc51eb85c56c","target":"record","created_at":"2026-07-05T10:09:28Z","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":"3b15757de0510e23b48599f75211b9acae7f48f8bebd64d45ef31ccad92362ac","cross_cats_sorted":["astro-ph.CO","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-02-04T15:41:55Z","title_canon_sha256":"d5fec58cdcad447ee1e4105c35bd9db91bebe592837fed84f75475b24ca63d3f"},"schema_version":"1.0","source":{"id":"2502.02420","kind":"arxiv","version":1}},"canonical_sha256":"168645e869c817a625f737ba243eef0377ea78da3945686506eab2eb4edc9dc6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"168645e869c817a625f737ba243eef0377ea78da3945686506eab2eb4edc9dc6","first_computed_at":"2026-07-05T10:09:28.476029Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:09:28.476029Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2eriHT9Pxozxbc95Uj49soIC09qOzDOTz/X23NAhVS7CnDg+FVpbZ3/ievvGVEYRstVQ1Iadtx1KQVO9clBgBg==","signature_status":"signed_v1","signed_at":"2026-07-05T10:09:28.476441Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.02420","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cfc8d59614c47a49c3639c67f262e26d739c8bd84e1e996b5893cc51eb85c56c","sha256:378c7d88824f48cf86bc8085f3ef87d83668cdaa8483e109c17d1d33afd2e430"],"state_sha256":"20bb506937cd6e30407d22022084aa011815550a2b002551a760426dfc9d65e9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1GCgphj2zacYuS/HIgYAvu4qiC84WSI3GkdotA0qrRvaHK30MkIE55gx6DARMx1EoyWq+TjmDaI+s2CYtT4xBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T21:35:04.421565Z","bundle_sha256":"68fb56fcfe876fd7316be32c16130f7cb07a5da07d2a0593fd40b6033c6af96b"}}