{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:BL3HK5QN2LYD4RPFOLZO4AEKSP","short_pith_number":"pith:BL3HK5QN","canonical_record":{"source":{"id":"1502.05296","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-02-18T16:48:21Z","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph"],"title_canon_sha256":"446ed57f880567c783cd85a2afb0231807ad277f73dc3a82a8d92ef3f8873b77","abstract_canon_sha256":"2a7bf722b27b0bd9a1c0971904f215726b1d758123862289f52f2d68b9ff2a73"},"schema_version":"1.0"},"canonical_sha256":"0af675760dd2f03e45e572f2ee008a93df9daa44395227b0427c47a6f5202b7e","source":{"kind":"arxiv","id":"1502.05296","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05296","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05296v1","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05296","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"pith_short_12","alias_value":"BL3HK5QN2LYD","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BL3HK5QN2LYD4RPF","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BL3HK5QN","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:BL3HK5QN2LYD4RPFOLZO4AEKSP","target":"record","payload":{"canonical_record":{"source":{"id":"1502.05296","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-02-18T16:48:21Z","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph"],"title_canon_sha256":"446ed57f880567c783cd85a2afb0231807ad277f73dc3a82a8d92ef3f8873b77","abstract_canon_sha256":"2a7bf722b27b0bd9a1c0971904f215726b1d758123862289f52f2d68b9ff2a73"},"schema_version":"1.0"},"canonical_sha256":"0af675760dd2f03e45e572f2ee008a93df9daa44395227b0427c47a6f5202b7e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:52.024447Z","signature_b64":"mOb21ibo7Oj9aJIQrPSZdYTT6l2Kn2dx+Y79bL4y1CUow0KwgP0tyrKbNIk1ds+oGh9dorIk3F8EXco1JWZhBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0af675760dd2f03e45e572f2ee008a93df9daa44395227b0427c47a6f5202b7e","last_reissued_at":"2026-05-18T02:26:52.024036Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:52.024036Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.05296","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":"2026-05-18T02:26:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"csreILx4naGUrTzmpzzbGKraNq9yWIfgYpRZOb7dmuc0/XGKwvt0rtIb2Sx1sflRI7KjTu2BfPNC0BY1oZRTDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:11:11.299039Z"},"content_sha256":"2f64b9e211400b72c898d8266029d6bf50b3f45d2273db0dada14f52c552b023","schema_version":"1.0","event_id":"sha256:2f64b9e211400b72c898d8266029d6bf50b3f45d2273db0dada14f52c552b023"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:BL3HK5QN2LYD4RPFOLZO4AEKSP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Lectures on the Cosmological Constant Problem","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc","hep-ph"],"primary_cat":"hep-th","authors_text":"Antonio Padilla","submitted_at":"2015-02-18T16:48:21Z","abstract_excerpt":"These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, emphasising the importance of radiative instability and the need to repeatedly fine tune as we change our effective description. Weinberg's no go theorem is worked through in detail. I review a number of proposals including Linde's universe multiplication, Coleman's wormholes, the fat graviton, and SLED, to name a few. Large distance modifications of gravity are also discussed, with causality considerations pointing towar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05296","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":"2026-05-18T02:26:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j/cY0fRWRLNa4qmuA+hXKTEyBjEs0QTZhiAz3f0baEingUYJo8+a0bYM77OJFe0KXg1STUMm/QnReBr3bmWlAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:11:11.299385Z"},"content_sha256":"3673702b4f54c7c7a725bde86e4d72941815eea79e0f3ee0098ea306dc5df4f2","schema_version":"1.0","event_id":"sha256:3673702b4f54c7c7a725bde86e4d72941815eea79e0f3ee0098ea306dc5df4f2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/bundle.json","state_url":"https://pith.science/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/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":"2026-06-02T08:11:11Z","links":{"resolver":"https://pith.science/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP","bundle":"https://pith.science/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/bundle.json","state":"https://pith.science/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BL3HK5QN2LYD4RPFOLZO4AEKSP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:BL3HK5QN2LYD4RPFOLZO4AEKSP","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":"2a7bf722b27b0bd9a1c0971904f215726b1d758123862289f52f2d68b9ff2a73","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-02-18T16:48:21Z","title_canon_sha256":"446ed57f880567c783cd85a2afb0231807ad277f73dc3a82a8d92ef3f8873b77"},"schema_version":"1.0","source":{"id":"1502.05296","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05296","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05296v1","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05296","created_at":"2026-05-18T02:26:52Z"},{"alias_kind":"pith_short_12","alias_value":"BL3HK5QN2LYD","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BL3HK5QN2LYD4RPF","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BL3HK5QN","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:3673702b4f54c7c7a725bde86e4d72941815eea79e0f3ee0098ea306dc5df4f2","target":"graph","created_at":"2026-05-18T02:26:52Z","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":"These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, emphasising the importance of radiative instability and the need to repeatedly fine tune as we change our effective description. Weinberg's no go theorem is worked through in detail. I review a number of proposals including Linde's universe multiplication, Coleman's wormholes, the fat graviton, and SLED, to name a few. Large distance modifications of gravity are also discussed, with causality considerations pointing towar","authors_text":"Antonio Padilla","cross_cats":["astro-ph.CO","gr-qc","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-02-18T16:48:21Z","title":"Lectures on the Cosmological Constant Problem"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05296","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":"sha256:2f64b9e211400b72c898d8266029d6bf50b3f45d2273db0dada14f52c552b023","target":"record","created_at":"2026-05-18T02:26:52Z","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":"2a7bf722b27b0bd9a1c0971904f215726b1d758123862289f52f2d68b9ff2a73","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2015-02-18T16:48:21Z","title_canon_sha256":"446ed57f880567c783cd85a2afb0231807ad277f73dc3a82a8d92ef3f8873b77"},"schema_version":"1.0","source":{"id":"1502.05296","kind":"arxiv","version":1}},"canonical_sha256":"0af675760dd2f03e45e572f2ee008a93df9daa44395227b0427c47a6f5202b7e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0af675760dd2f03e45e572f2ee008a93df9daa44395227b0427c47a6f5202b7e","first_computed_at":"2026-05-18T02:26:52.024036Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:52.024036Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mOb21ibo7Oj9aJIQrPSZdYTT6l2Kn2dx+Y79bL4y1CUow0KwgP0tyrKbNIk1ds+oGh9dorIk3F8EXco1JWZhBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:52.024447Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.05296","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2f64b9e211400b72c898d8266029d6bf50b3f45d2273db0dada14f52c552b023","sha256:3673702b4f54c7c7a725bde86e4d72941815eea79e0f3ee0098ea306dc5df4f2"],"state_sha256":"83fae598d7497b08e20609bdc6660e2bbd26d45c8f0d8102858df045fa82c78d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zHzfk1vFZnto6qfmIKYYMzwY41Q/l8SoczhrMOyaZ0PnDVFOrxs5ZDWm7b3CdyGn518KfYb7u2NM7lTSfgLHBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T08:11:11.301147Z","bundle_sha256":"2f0e7856b56c5c01ef16b05d2f1c52e6ab8ed84dea6758398f4be85ef87fdb87"}}