{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:3QCMAKF6BRIY3RCSPR4AKK6TR6","short_pith_number":"pith:3QCMAKF6","canonical_record":{"source":{"id":"2502.20137","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-02-27T14:31:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"af37bbe1251d160daaf65898e64b3bee248198bb3bad0ea86e6d0a4fdb80ef40","abstract_canon_sha256":"abc15e6472441f20e47cd17be4529511c3c8d5e54aafedbc6847a81aeb8ea52c"},"schema_version":"1.0"},"canonical_sha256":"dc04c028be0c518dc4527c78052bd38f9391fe820248e07fb0aea6ce6eba6e97","source":{"kind":"arxiv","id":"2502.20137","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.20137","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"arxiv_version","alias_value":"2502.20137v2","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.20137","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_12","alias_value":"3QCMAKF6BRIY","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_16","alias_value":"3QCMAKF6BRIY3RCS","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_8","alias_value":"3QCMAKF6","created_at":"2026-07-05T11:34:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:3QCMAKF6BRIY3RCSPR4AKK6TR6","target":"record","payload":{"canonical_record":{"source":{"id":"2502.20137","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-02-27T14:31:11Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"af37bbe1251d160daaf65898e64b3bee248198bb3bad0ea86e6d0a4fdb80ef40","abstract_canon_sha256":"abc15e6472441f20e47cd17be4529511c3c8d5e54aafedbc6847a81aeb8ea52c"},"schema_version":"1.0"},"canonical_sha256":"dc04c028be0c518dc4527c78052bd38f9391fe820248e07fb0aea6ce6eba6e97","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:34:47.876034Z","signature_b64":"YGCbYA3bM+zpFcQeHHoWDjKv8RcfKESuBG15mx3nFXJGQvr4J58jcu+cLteqFHPwZFwWTPPVSFaB4UbWUrJ8CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dc04c028be0c518dc4527c78052bd38f9391fe820248e07fb0aea6ce6eba6e97","last_reissued_at":"2026-07-05T11:34:47.875461Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:34:47.875461Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.20137","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":"2026-07-05T11:34:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"35tPDrtxVMcHkVjiPR9exwAzqaeL44UUiFvQ8QOj6Oshqh+mettcwMM9PUjMS7mCBEfJZlXWtc9uPcqVWEWHCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T12:52:40.102078Z"},"content_sha256":"0bfdc3e6686098d5edd23083630a7a861d266831c26d6037500375f4e79f9170","schema_version":"1.0","event_id":"sha256:0bfdc3e6686098d5edd23083630a7a861d266831c26d6037500375f4e79f9170"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:3QCMAKF6BRIY3RCSPR4AKK6TR6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Scalar-Induced Gravitational Waves in Modified Gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"Andrea Maselli, Angelo Ricciardone, Anjali Abirami Kugarajh, Marisol Traforetti, Sabino Matarrese","submitted_at":"2025-02-27T14:31:11Z","abstract_excerpt":"Scalar-Induced Gravitational Waves (SIGWs), second-order tensor modes sourced by first-order scalar fluctuations in General Relativity (GR), are expected to contribute to the Stochastic Gravitational Wave Background (SGWB) potentially detectable by current and future gravitational wave interferometers. In the framework of GR, this SGWB represents an unavoidable contribution to the gravitational wave spectrum. In this paper, we go beyond GR and we investigate the behavior of SIGWs in f(R) gravity. We explore how the SIGW spectrum is influenced across a broad range of frequencies, from the nano-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.20137","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2502.20137/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":"2026-07-05T11:34:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wL8LbHeU3hy9KdbgJOHeO7OoY573onnFesNkcK6RBT7pfgaKolAvJ+ITXKHv638bqm0g9TkmDq7T9UPWYe0SAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T12:52:40.103015Z"},"content_sha256":"8e921c0dfeab8ac24d1427492738809e4286ffb51f1153b817c983e3ac909e3c","schema_version":"1.0","event_id":"sha256:8e921c0dfeab8ac24d1427492738809e4286ffb51f1153b817c983e3ac909e3c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/bundle.json","state_url":"https://pith.science/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/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":"2026-08-13T12:52:40Z","links":{"resolver":"https://pith.science/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6","bundle":"https://pith.science/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/bundle.json","state":"https://pith.science/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3QCMAKF6BRIY3RCSPR4AKK6TR6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:3QCMAKF6BRIY3RCSPR4AKK6TR6","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":"abc15e6472441f20e47cd17be4529511c3c8d5e54aafedbc6847a81aeb8ea52c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-02-27T14:31:11Z","title_canon_sha256":"af37bbe1251d160daaf65898e64b3bee248198bb3bad0ea86e6d0a4fdb80ef40"},"schema_version":"1.0","source":{"id":"2502.20137","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.20137","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"arxiv_version","alias_value":"2502.20137v2","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.20137","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_12","alias_value":"3QCMAKF6BRIY","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_16","alias_value":"3QCMAKF6BRIY3RCS","created_at":"2026-07-05T11:34:47Z"},{"alias_kind":"pith_short_8","alias_value":"3QCMAKF6","created_at":"2026-07-05T11:34:47Z"}],"graph_snapshots":[{"event_id":"sha256:8e921c0dfeab8ac24d1427492738809e4286ffb51f1153b817c983e3ac909e3c","target":"graph","created_at":"2026-07-05T11:34:47Z","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/2502.20137/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Scalar-Induced Gravitational Waves (SIGWs), second-order tensor modes sourced by first-order scalar fluctuations in General Relativity (GR), are expected to contribute to the Stochastic Gravitational Wave Background (SGWB) potentially detectable by current and future gravitational wave interferometers. In the framework of GR, this SGWB represents an unavoidable contribution to the gravitational wave spectrum. In this paper, we go beyond GR and we investigate the behavior of SIGWs in f(R) gravity. We explore how the SIGW spectrum is influenced across a broad range of frequencies, from the nano-","authors_text":"Andrea Maselli, Angelo Ricciardone, Anjali Abirami Kugarajh, Marisol Traforetti, Sabino Matarrese","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-02-27T14:31:11Z","title":"Scalar-Induced Gravitational Waves in Modified Gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.20137","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":"sha256:0bfdc3e6686098d5edd23083630a7a861d266831c26d6037500375f4e79f9170","target":"record","created_at":"2026-07-05T11:34:47Z","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":"abc15e6472441f20e47cd17be4529511c3c8d5e54aafedbc6847a81aeb8ea52c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-02-27T14:31:11Z","title_canon_sha256":"af37bbe1251d160daaf65898e64b3bee248198bb3bad0ea86e6d0a4fdb80ef40"},"schema_version":"1.0","source":{"id":"2502.20137","kind":"arxiv","version":2}},"canonical_sha256":"dc04c028be0c518dc4527c78052bd38f9391fe820248e07fb0aea6ce6eba6e97","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dc04c028be0c518dc4527c78052bd38f9391fe820248e07fb0aea6ce6eba6e97","first_computed_at":"2026-07-05T11:34:47.875461Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:34:47.875461Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YGCbYA3bM+zpFcQeHHoWDjKv8RcfKESuBG15mx3nFXJGQvr4J58jcu+cLteqFHPwZFwWTPPVSFaB4UbWUrJ8CA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:34:47.876034Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.20137","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0bfdc3e6686098d5edd23083630a7a861d266831c26d6037500375f4e79f9170","sha256:8e921c0dfeab8ac24d1427492738809e4286ffb51f1153b817c983e3ac909e3c"],"state_sha256":"3e310a13bbe77aeb07f862e30c3e71f7eab44ace822273ef03e750997143c478"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fPAlXXOkZSDc8Lkq6r5qZUxKqL2TaI3NO5gNuW9CtNccgDA7z+7D9XHm7RhjI1bs5XjRPqrrEzIzKhRFrXAHAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T12:52:40.129138Z","bundle_sha256":"9882f6790ece67801fe4bc9b9e64b6c7556e0d4f2ca0bdf363b83cbd8e8f7f61"}}