{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:J5NF2TX756UTEYC5N2GDFGXYDW","short_pith_number":"pith:J5NF2TX7","canonical_record":{"source":{"id":"1506.05975","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-06-19T12:38:07Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"50a9bf088e3b528ae2de5e24fa588e6dd01b332770de7568b6a7b54550413cf8","abstract_canon_sha256":"910dd5b47f3dff9273adcb0e4363de2230c6aa1db28ca3598bd37ff1e8bbdf1e"},"schema_version":"1.0"},"canonical_sha256":"4f5a5d4effefa932605d6e8c329af81da7231540ce6fcc95dd54d67271332445","source":{"kind":"arxiv","id":"1506.05975","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.05975","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"arxiv_version","alias_value":"1506.05975v1","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.05975","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"pith_short_12","alias_value":"J5NF2TX756UT","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"J5NF2TX756UTEYC5","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"J5NF2TX7","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:J5NF2TX756UTEYC5N2GDFGXYDW","target":"record","payload":{"canonical_record":{"source":{"id":"1506.05975","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-06-19T12:38:07Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"50a9bf088e3b528ae2de5e24fa588e6dd01b332770de7568b6a7b54550413cf8","abstract_canon_sha256":"910dd5b47f3dff9273adcb0e4363de2230c6aa1db28ca3598bd37ff1e8bbdf1e"},"schema_version":"1.0"},"canonical_sha256":"4f5a5d4effefa932605d6e8c329af81da7231540ce6fcc95dd54d67271332445","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:33:42.822084Z","signature_b64":"Kn4aXnmPIGPy/T+FDUY0QR7v1T5jeExPjIUpFLIJb6DSQ8UE7LC6jp/3LhBgVXvYn/8caJkHlCR+7JYPxK6DBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4f5a5d4effefa932605d6e8c329af81da7231540ce6fcc95dd54d67271332445","last_reissued_at":"2026-05-18T01:33:42.821550Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:33:42.821550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.05975","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":"2026-05-18T01:33:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KGqqrx6WMhyp2Ma2mHSJ9ZUTU0Me5FS2+UrIyw+yNVhbeiYS7OAcqkw1FU+vuSyLZxfJo1xnUk2qsGABMlXIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:39:07.617298Z"},"content_sha256":"c78e65ae0a4af5d2b299e89ac4870af7f00465c292402a23d0caa01bd50cf88d","schema_version":"1.0","event_id":"sha256:c78e65ae0a4af5d2b299e89ac4870af7f00465c292402a23d0caa01bd50cf88d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:J5NF2TX756UTEYC5N2GDFGXYDW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Subtraction method in the second random--phase approximation: first applications with a Skyrme energy functional","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"nucl-th","authors_text":"D. Gambacurta, J. Engel, M. Grasso","submitted_at":"2015-06-19T12:38:07Z","abstract_excerpt":"We make use of a subtraction procedure, introduced to overcome double--counting problems in beyond--mean--field theories, in the second random--phase--approximation (SRPA) for the first time. This procedure guarantees the stability of SRPA (so that all excitation energies are real). We show that the method fits perfectly into nuclear density--functional theory. We illustrate applications to the monopole and quadrupole response and to low--lying $0^+$ and $2^+$ states in the nucleus $^{16}$O. We show that the subtraction procedure leads to: (i) results that are weakly cutoff dependent; (ii) a c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.05975","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":""},"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":"2026-05-18T01:33:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WAu/Gmw8VBvB8OaGYMvIz/QLOPvoMBYEIQ/wsARdZhX/bb97kr7+imxau2eeJfMmUAXQ0R/mZCsxatJ1nCQeAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:39:07.617668Z"},"content_sha256":"d6d07c78dc2260ab560d77b9cbe2fb1384b623f8edb97907174440206654e920","schema_version":"1.0","event_id":"sha256:d6d07c78dc2260ab560d77b9cbe2fb1384b623f8edb97907174440206654e920"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J5NF2TX756UTEYC5N2GDFGXYDW/bundle.json","state_url":"https://pith.science/pith/J5NF2TX756UTEYC5N2GDFGXYDW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J5NF2TX756UTEYC5N2GDFGXYDW/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":"2026-06-01T19:39:07Z","links":{"resolver":"https://pith.science/pith/J5NF2TX756UTEYC5N2GDFGXYDW","bundle":"https://pith.science/pith/J5NF2TX756UTEYC5N2GDFGXYDW/bundle.json","state":"https://pith.science/pith/J5NF2TX756UTEYC5N2GDFGXYDW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J5NF2TX756UTEYC5N2GDFGXYDW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:J5NF2TX756UTEYC5N2GDFGXYDW","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":"910dd5b47f3dff9273adcb0e4363de2230c6aa1db28ca3598bd37ff1e8bbdf1e","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-06-19T12:38:07Z","title_canon_sha256":"50a9bf088e3b528ae2de5e24fa588e6dd01b332770de7568b6a7b54550413cf8"},"schema_version":"1.0","source":{"id":"1506.05975","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.05975","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"arxiv_version","alias_value":"1506.05975v1","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.05975","created_at":"2026-05-18T01:33:42Z"},{"alias_kind":"pith_short_12","alias_value":"J5NF2TX756UT","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"J5NF2TX756UTEYC5","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"J5NF2TX7","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:d6d07c78dc2260ab560d77b9cbe2fb1384b623f8edb97907174440206654e920","target":"graph","created_at":"2026-05-18T01:33:42Z","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 make use of a subtraction procedure, introduced to overcome double--counting problems in beyond--mean--field theories, in the second random--phase--approximation (SRPA) for the first time. This procedure guarantees the stability of SRPA (so that all excitation energies are real). We show that the method fits perfectly into nuclear density--functional theory. We illustrate applications to the monopole and quadrupole response and to low--lying $0^+$ and $2^+$ states in the nucleus $^{16}$O. We show that the subtraction procedure leads to: (i) results that are weakly cutoff dependent; (ii) a c","authors_text":"D. Gambacurta, J. Engel, M. Grasso","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-06-19T12:38:07Z","title":"Subtraction method in the second random--phase approximation: first applications with a Skyrme energy functional"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.05975","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:c78e65ae0a4af5d2b299e89ac4870af7f00465c292402a23d0caa01bd50cf88d","target":"record","created_at":"2026-05-18T01:33:42Z","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":"910dd5b47f3dff9273adcb0e4363de2230c6aa1db28ca3598bd37ff1e8bbdf1e","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-06-19T12:38:07Z","title_canon_sha256":"50a9bf088e3b528ae2de5e24fa588e6dd01b332770de7568b6a7b54550413cf8"},"schema_version":"1.0","source":{"id":"1506.05975","kind":"arxiv","version":1}},"canonical_sha256":"4f5a5d4effefa932605d6e8c329af81da7231540ce6fcc95dd54d67271332445","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4f5a5d4effefa932605d6e8c329af81da7231540ce6fcc95dd54d67271332445","first_computed_at":"2026-05-18T01:33:42.821550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:42.821550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Kn4aXnmPIGPy/T+FDUY0QR7v1T5jeExPjIUpFLIJb6DSQ8UE7LC6jp/3LhBgVXvYn/8caJkHlCR+7JYPxK6DBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:42.822084Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.05975","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c78e65ae0a4af5d2b299e89ac4870af7f00465c292402a23d0caa01bd50cf88d","sha256:d6d07c78dc2260ab560d77b9cbe2fb1384b623f8edb97907174440206654e920"],"state_sha256":"a023a92a3821f8eb0e4490685e2a75b7fdd1dd7a3c15dd07f499fb77a5fa467c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GYRyHxx41xrEwEWX/E9WBL2SlAqPGA7CspWOgsxxgE/uX91s9QpEXKYaQap/C+Fw8t1IPbgP36xQIdkcjF5cAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T19:39:07.619684Z","bundle_sha256":"aa5cd0efb1684f14773af9f1dd70363900ae5cb668cc338fe01d5cdabbfdc83f"}}