{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:EKHY4JJZZ6XJD6D3EJQFP7ETSZ","short_pith_number":"pith:EKHY4JJZ","canonical_record":{"source":{"id":"1802.02399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-02-07T12:21:10Z","cross_cats_sorted":[],"title_canon_sha256":"2f16cab3dac01e393574909f383247c0c71d90283d2b6d66a40c6295775dc3d0","abstract_canon_sha256":"e7dab0dd44cc83716b455dd9f28888b647be06abb6913f15fad4f16777f05c18"},"schema_version":"1.0"},"canonical_sha256":"228f8e2539cfae91f87b226057fc93966fe79b62b7a146f1539e78c2185402db","source":{"kind":"arxiv","id":"1802.02399","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.02399","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"arxiv_version","alias_value":"1802.02399v2","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.02399","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"pith_short_12","alias_value":"EKHY4JJZZ6XJ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"EKHY4JJZZ6XJD6D3","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"EKHY4JJZ","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:EKHY4JJZZ6XJD6D3EJQFP7ETSZ","target":"record","payload":{"canonical_record":{"source":{"id":"1802.02399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-02-07T12:21:10Z","cross_cats_sorted":[],"title_canon_sha256":"2f16cab3dac01e393574909f383247c0c71d90283d2b6d66a40c6295775dc3d0","abstract_canon_sha256":"e7dab0dd44cc83716b455dd9f28888b647be06abb6913f15fad4f16777f05c18"},"schema_version":"1.0"},"canonical_sha256":"228f8e2539cfae91f87b226057fc93966fe79b62b7a146f1539e78c2185402db","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:10:02.970284Z","signature_b64":"FxvEsAtCLErt9j6J9fdFvT7Q/2mSVNoEn5RHH/PAEkfQBSrFBQuu7BNPRwfTScvXY0klY41kMmlTgorPgo+uCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"228f8e2539cfae91f87b226057fc93966fe79b62b7a146f1539e78c2185402db","last_reissued_at":"2026-05-18T00:10:02.969539Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:10:02.969539Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.02399","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":"2026-05-18T00:10:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xYBdXxHBc1Y/Yzz8dVLYciJSCv9pBMCYJ+3pOI01RDJr4BWBaD1mZWlwwcgh4iHsDYsCga9E/uTO1GsV4ZQzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T03:01:24.890870Z"},"content_sha256":"27c1738cb32b09a90dd838e89247683c59238752b1bfd0b81144e9277c6a732e","schema_version":"1.0","event_id":"sha256:27c1738cb32b09a90dd838e89247683c59238752b1bfd0b81144e9277c6a732e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:EKHY4JJZZ6XJD6D3EJQFP7ETSZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Compact stars in Energy-Momentum Squared Gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Mahmood Roshan, Nasrin Nari","submitted_at":"2018-02-07T12:21:10Z","abstract_excerpt":"A simple generalization to Einstein's general relativity (GR) was recently proposed which allows a correction term $T_{\\alpha\\beta}T^{\\alpha\\beta}$ in the action functional of the theory. This theory is called Energy-Momentum Squared Gravity (EMSG) and introduces a new coupling parameter $\\eta$. EMSG resolves the big bang singularity and has a viable sequence of cosmological epochs in its thermal history. {Interestingly, in the vacuum EMSG is equivalent to GR, and its effects appear only inside the matter-energy distribution. More specifically, its consequences appear in high curvature regime."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.02399","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":"2026-05-18T00:10:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"elF2AYOcQIzDpM8sZBthW3Yn2HUhF7H3l8qMPnbj77nqspYzyogGuh5vHBYVlcdD3t/CDNAHQu2JNHcNdG7MCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T03:01:24.891577Z"},"content_sha256":"f9954066e3d68aa270fbf96ab3ea316b5bb126f4a6a354b397e92cfccf210335","schema_version":"1.0","event_id":"sha256:f9954066e3d68aa270fbf96ab3ea316b5bb126f4a6a354b397e92cfccf210335"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/bundle.json","state_url":"https://pith.science/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/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":"2026-05-25T03:01:24Z","links":{"resolver":"https://pith.science/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ","bundle":"https://pith.science/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/bundle.json","state":"https://pith.science/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EKHY4JJZZ6XJD6D3EJQFP7ETSZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:EKHY4JJZZ6XJD6D3EJQFP7ETSZ","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":"e7dab0dd44cc83716b455dd9f28888b647be06abb6913f15fad4f16777f05c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-02-07T12:21:10Z","title_canon_sha256":"2f16cab3dac01e393574909f383247c0c71d90283d2b6d66a40c6295775dc3d0"},"schema_version":"1.0","source":{"id":"1802.02399","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.02399","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"arxiv_version","alias_value":"1802.02399v2","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.02399","created_at":"2026-05-18T00:10:02Z"},{"alias_kind":"pith_short_12","alias_value":"EKHY4JJZZ6XJ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"EKHY4JJZZ6XJD6D3","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"EKHY4JJZ","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:f9954066e3d68aa270fbf96ab3ea316b5bb126f4a6a354b397e92cfccf210335","target":"graph","created_at":"2026-05-18T00:10:02Z","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":"A simple generalization to Einstein's general relativity (GR) was recently proposed which allows a correction term $T_{\\alpha\\beta}T^{\\alpha\\beta}$ in the action functional of the theory. This theory is called Energy-Momentum Squared Gravity (EMSG) and introduces a new coupling parameter $\\eta$. EMSG resolves the big bang singularity and has a viable sequence of cosmological epochs in its thermal history. {Interestingly, in the vacuum EMSG is equivalent to GR, and its effects appear only inside the matter-energy distribution. More specifically, its consequences appear in high curvature regime.","authors_text":"Mahmood Roshan, Nasrin Nari","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-02-07T12:21:10Z","title":"Compact stars in Energy-Momentum Squared Gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.02399","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":"sha256:27c1738cb32b09a90dd838e89247683c59238752b1bfd0b81144e9277c6a732e","target":"record","created_at":"2026-05-18T00:10:02Z","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":"e7dab0dd44cc83716b455dd9f28888b647be06abb6913f15fad4f16777f05c18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-02-07T12:21:10Z","title_canon_sha256":"2f16cab3dac01e393574909f383247c0c71d90283d2b6d66a40c6295775dc3d0"},"schema_version":"1.0","source":{"id":"1802.02399","kind":"arxiv","version":2}},"canonical_sha256":"228f8e2539cfae91f87b226057fc93966fe79b62b7a146f1539e78c2185402db","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"228f8e2539cfae91f87b226057fc93966fe79b62b7a146f1539e78c2185402db","first_computed_at":"2026-05-18T00:10:02.969539Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:10:02.969539Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FxvEsAtCLErt9j6J9fdFvT7Q/2mSVNoEn5RHH/PAEkfQBSrFBQuu7BNPRwfTScvXY0klY41kMmlTgorPgo+uCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:10:02.970284Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.02399","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:27c1738cb32b09a90dd838e89247683c59238752b1bfd0b81144e9277c6a732e","sha256:f9954066e3d68aa270fbf96ab3ea316b5bb126f4a6a354b397e92cfccf210335"],"state_sha256":"79820923400458823db8e7327dd7eb108ae50381680a33b366899ad803a4ad26"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g8MEIlvF6yeLgZrim5P0Oa8k1hTPUAcrXkSzY78d4R098ovFGq4CuATb1M7AcC2aw+LNdqkhLfXQmFeUNKpfBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T03:01:24.895450Z","bundle_sha256":"eb1f7d78d74df7079846ddaa16d41d73e4e79b61cf508a4b87ddd09584fd660d"}}