{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:4XKFOV3I5LFQCUUAKJSADXQEWN","short_pith_number":"pith:4XKFOV3I","canonical_record":{"source":{"id":"1302.2593","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-11T20:04:53Z","cross_cats_sorted":[],"title_canon_sha256":"0e40c459dc56c21c53de7c4245b2250c793c0ac6ab9ed1866a7befeb1070718b","abstract_canon_sha256":"50a731b9b1dc4e552e00f5b6a7bec5987a8dc9d45d3336b5808aaf44dad92422"},"schema_version":"1.0"},"canonical_sha256":"e5d4575768eacb015280526401de04b37e0f13a5b11311390c71e170f41fb864","source":{"kind":"arxiv","id":"1302.2593","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.2593","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"arxiv_version","alias_value":"1302.2593v2","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.2593","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"pith_short_12","alias_value":"4XKFOV3I5LFQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"4XKFOV3I5LFQCUUA","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"4XKFOV3I","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:4XKFOV3I5LFQCUUAKJSADXQEWN","target":"record","payload":{"canonical_record":{"source":{"id":"1302.2593","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-11T20:04:53Z","cross_cats_sorted":[],"title_canon_sha256":"0e40c459dc56c21c53de7c4245b2250c793c0ac6ab9ed1866a7befeb1070718b","abstract_canon_sha256":"50a731b9b1dc4e552e00f5b6a7bec5987a8dc9d45d3336b5808aaf44dad92422"},"schema_version":"1.0"},"canonical_sha256":"e5d4575768eacb015280526401de04b37e0f13a5b11311390c71e170f41fb864","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:26:22.525286Z","signature_b64":"mjao9mejhU1Laeys+a8PKhJNEC3ZABsr+Z7Uu5Uj40/Le11rAMU4KmX3tGCxOzpBzxHGVJoiHEBA9v7/MMT/Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e5d4575768eacb015280526401de04b37e0f13a5b11311390c71e170f41fb864","last_reissued_at":"2026-05-18T03:26:22.524522Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:26:22.524522Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.2593","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":"2026-05-18T03:26:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hDpJwqETx5fCOTHO947WYEkxq4C28ytFaq1UYMiIaT2lEfgBvnCkKK08XZlQe9Yb2E/44XQIVQmWHGQKAItTAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T15:19:38.128613Z"},"content_sha256":"ee0d1ad7754f398a6eac8b1055fe195165e42494cdefb1667a84636807c37874","schema_version":"1.0","event_id":"sha256:ee0d1ad7754f398a6eac8b1055fe195165e42494cdefb1667a84636807c37874"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:4XKFOV3I5LFQCUUAKJSADXQEWN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraints on Modified Gravity from ACT and SPT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alessandro Melchiorri, Andrea Marchini, Luca Pagano, Valentina Salvatelli","submitted_at":"2013-02-11T20:04:53Z","abstract_excerpt":"The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new and precise measurements of the Cosmic Microwave Background anisotropy damping tail. This region of the CMB angular spectra, thanks to the angular distortions produced by gravitational lensing, can probe the growth of matter perturbations and provide a test for general relativity. Here we make use of the ACT and SPT power spectrum measurements (combined with the recent WMAP9 data) to constrain f(R) gravity theories. Adopting a parametrized approach, we obtain an upper limit on the lengthscale of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.2593","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":"2026-05-18T03:26:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kkFMx6cwrn5u20M9NsGLT+3dmE8gtFF/wGJip72poMQSFxpuHdxA7MCvtnEVgQ400f8vk2khDywyY80/q/P3Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T15:19:38.129335Z"},"content_sha256":"a0dcd73bfd37a47d267af165f650583b183d33a6f29b045f8113282de053c2d2","schema_version":"1.0","event_id":"sha256:a0dcd73bfd37a47d267af165f650583b183d33a6f29b045f8113282de053c2d2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/bundle.json","state_url":"https://pith.science/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/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":"2026-06-11T15:19:38Z","links":{"resolver":"https://pith.science/pith/4XKFOV3I5LFQCUUAKJSADXQEWN","bundle":"https://pith.science/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/bundle.json","state":"https://pith.science/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4XKFOV3I5LFQCUUAKJSADXQEWN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:4XKFOV3I5LFQCUUAKJSADXQEWN","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":"50a731b9b1dc4e552e00f5b6a7bec5987a8dc9d45d3336b5808aaf44dad92422","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-11T20:04:53Z","title_canon_sha256":"0e40c459dc56c21c53de7c4245b2250c793c0ac6ab9ed1866a7befeb1070718b"},"schema_version":"1.0","source":{"id":"1302.2593","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.2593","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"arxiv_version","alias_value":"1302.2593v2","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.2593","created_at":"2026-05-18T03:26:22Z"},{"alias_kind":"pith_short_12","alias_value":"4XKFOV3I5LFQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"4XKFOV3I5LFQCUUA","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"4XKFOV3I","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:a0dcd73bfd37a47d267af165f650583b183d33a6f29b045f8113282de053c2d2","target":"graph","created_at":"2026-05-18T03:26:22Z","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":"The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new and precise measurements of the Cosmic Microwave Background anisotropy damping tail. This region of the CMB angular spectra, thanks to the angular distortions produced by gravitational lensing, can probe the growth of matter perturbations and provide a test for general relativity. Here we make use of the ACT and SPT power spectrum measurements (combined with the recent WMAP9 data) to constrain f(R) gravity theories. Adopting a parametrized approach, we obtain an upper limit on the lengthscale of","authors_text":"Alessandro Melchiorri, Andrea Marchini, Luca Pagano, Valentina Salvatelli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-11T20:04:53Z","title":"Constraints on Modified Gravity from ACT and SPT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.2593","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:ee0d1ad7754f398a6eac8b1055fe195165e42494cdefb1667a84636807c37874","target":"record","created_at":"2026-05-18T03:26:22Z","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":"50a731b9b1dc4e552e00f5b6a7bec5987a8dc9d45d3336b5808aaf44dad92422","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-11T20:04:53Z","title_canon_sha256":"0e40c459dc56c21c53de7c4245b2250c793c0ac6ab9ed1866a7befeb1070718b"},"schema_version":"1.0","source":{"id":"1302.2593","kind":"arxiv","version":2}},"canonical_sha256":"e5d4575768eacb015280526401de04b37e0f13a5b11311390c71e170f41fb864","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e5d4575768eacb015280526401de04b37e0f13a5b11311390c71e170f41fb864","first_computed_at":"2026-05-18T03:26:22.524522Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:26:22.524522Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mjao9mejhU1Laeys+a8PKhJNEC3ZABsr+Z7Uu5Uj40/Le11rAMU4KmX3tGCxOzpBzxHGVJoiHEBA9v7/MMT/Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:26:22.525286Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.2593","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee0d1ad7754f398a6eac8b1055fe195165e42494cdefb1667a84636807c37874","sha256:a0dcd73bfd37a47d267af165f650583b183d33a6f29b045f8113282de053c2d2"],"state_sha256":"2cf757986524779e91b697732825fda8f438cac4bdfb52e6af6d1e128fe8d6a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jJP1lHHx0+qc6iQSBPKtmIu6q317DLCTjAZVK5bMZtMLna32SS8BRVPdSYjIdYO3bGODlafkV5aCvHkh8bkvDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T15:19:38.133479Z","bundle_sha256":"34642023caaa9f04e36bfd0228052e15d804e48caff21b2417a1cd99b0f57824"}}