{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:EOXEEZIZACQ35GJENO6DU6OWQW","short_pith_number":"pith:EOXEEZIZ","canonical_record":{"source":{"id":"2601.22084","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-01-29T18:23:38Z","cross_cats_sorted":["gr-qc","hep-th"],"title_canon_sha256":"ed74609c22e0fe3e442e1f97b42f3a9acb7361b153ad7af95b4dd87e90c16556","abstract_canon_sha256":"f87d910008b62b51296a4084f85a3cf93c9671f5c59ec71830d6b865706a1a4a"},"schema_version":"1.0"},"canonical_sha256":"23ae42651900a1be99246bbc3a79d685a35f5d8ac34a1ebaaea0615262e92be2","source":{"kind":"arxiv","id":"2601.22084","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.22084","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"arxiv_version","alias_value":"2601.22084v1","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.22084","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_12","alias_value":"EOXEEZIZACQ3","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_16","alias_value":"EOXEEZIZACQ35GJE","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_8","alias_value":"EOXEEZIZ","created_at":"2026-07-02T00:18:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:EOXEEZIZACQ35GJENO6DU6OWQW","target":"record","payload":{"canonical_record":{"source":{"id":"2601.22084","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-01-29T18:23:38Z","cross_cats_sorted":["gr-qc","hep-th"],"title_canon_sha256":"ed74609c22e0fe3e442e1f97b42f3a9acb7361b153ad7af95b4dd87e90c16556","abstract_canon_sha256":"f87d910008b62b51296a4084f85a3cf93c9671f5c59ec71830d6b865706a1a4a"},"schema_version":"1.0"},"canonical_sha256":"23ae42651900a1be99246bbc3a79d685a35f5d8ac34a1ebaaea0615262e92be2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-02T00:18:27.044860Z","signature_b64":"l/kMoE0Mpg5GacDEzfXcyKABcg3OXXb4ne4nAPnaIK0hKaDyXo1kR+/PNZxFa99O3z45oBu3qOp29waIwrB7AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"23ae42651900a1be99246bbc3a79d685a35f5d8ac34a1ebaaea0615262e92be2","last_reissued_at":"2026-07-02T00:18:27.044242Z","signature_status":"signed_v1","first_computed_at":"2026-07-02T00:18:27.044242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2601.22084","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":"2026-07-02T00:18:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+BjILgGKzQWMkexi/TZDhWNEY6f+8FbMWYnMZ7HWA4EE+kGNYOzCz9OeZRO0TC55XEVjwjLACXR38MvgHEA4Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T22:08:15.879311Z"},"content_sha256":"364f74e4c7e23f85f2d7dae435452ceaac55f8027323604f7f214ed92c4f3f83","schema_version":"1.0","event_id":"sha256:364f74e4c7e23f85f2d7dae435452ceaac55f8027323604f7f214ed92c4f3f83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:EOXEEZIZACQ35GJENO6DU6OWQW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Probing the Sound Speed of Dark Energy with a Lunar Laser Interferometer","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"Alfredo Gurrola, Oem Trivedi, Robert J. Scherrer","submitted_at":"2026-01-29T18:23:38Z","abstract_excerpt":"The sound speed of dark energy encodes fundamental information about the microphysics underlying cosmic acceleration, yet remains essentially unconstrained by existing observations. We demonstrate that a lunar-based laser interferometer, such as the proposed Laser Interferometer Lunar Antenna (LILA), can directly probe the sound speed of dark energy by measuring the real-time evolution of horizon-scale gravitational potentials. Operating in the ultra-low-frequency gravitational band inaccessible from Earth, LILA is sensitive to scalar metric perturbations sourced by dark energy dynamics. Using"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.22084","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2601.22084/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":"2026-07-02T00:18:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dRi+cftckWaYP3JSZpm0BWVavvmcptPJuZdwk4AXoxgnKyQsuZ55u2y578g3CNb/mAtw4fGo85LNxCfjfa9NAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T22:08:15.879929Z"},"content_sha256":"882207d3720c30ece9cb7ba11201f03990e256900f51c0c11a9a0910ae4d9d91","schema_version":"1.0","event_id":"sha256:882207d3720c30ece9cb7ba11201f03990e256900f51c0c11a9a0910ae4d9d91"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EOXEEZIZACQ35GJENO6DU6OWQW/bundle.json","state_url":"https://pith.science/pith/EOXEEZIZACQ35GJENO6DU6OWQW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EOXEEZIZACQ35GJENO6DU6OWQW/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":"2026-08-03T22:08:15Z","links":{"resolver":"https://pith.science/pith/EOXEEZIZACQ35GJENO6DU6OWQW","bundle":"https://pith.science/pith/EOXEEZIZACQ35GJENO6DU6OWQW/bundle.json","state":"https://pith.science/pith/EOXEEZIZACQ35GJENO6DU6OWQW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EOXEEZIZACQ35GJENO6DU6OWQW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:EOXEEZIZACQ35GJENO6DU6OWQW","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":"f87d910008b62b51296a4084f85a3cf93c9671f5c59ec71830d6b865706a1a4a","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-01-29T18:23:38Z","title_canon_sha256":"ed74609c22e0fe3e442e1f97b42f3a9acb7361b153ad7af95b4dd87e90c16556"},"schema_version":"1.0","source":{"id":"2601.22084","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.22084","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"arxiv_version","alias_value":"2601.22084v1","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.22084","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_12","alias_value":"EOXEEZIZACQ3","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_16","alias_value":"EOXEEZIZACQ35GJE","created_at":"2026-07-02T00:18:27Z"},{"alias_kind":"pith_short_8","alias_value":"EOXEEZIZ","created_at":"2026-07-02T00:18:27Z"}],"graph_snapshots":[{"event_id":"sha256:882207d3720c30ece9cb7ba11201f03990e256900f51c0c11a9a0910ae4d9d91","target":"graph","created_at":"2026-07-02T00:18:27Z","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/2601.22084/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The sound speed of dark energy encodes fundamental information about the microphysics underlying cosmic acceleration, yet remains essentially unconstrained by existing observations. We demonstrate that a lunar-based laser interferometer, such as the proposed Laser Interferometer Lunar Antenna (LILA), can directly probe the sound speed of dark energy by measuring the real-time evolution of horizon-scale gravitational potentials. Operating in the ultra-low-frequency gravitational band inaccessible from Earth, LILA is sensitive to scalar metric perturbations sourced by dark energy dynamics. Using","authors_text":"Alfredo Gurrola, Oem Trivedi, Robert J. Scherrer","cross_cats":["gr-qc","hep-th"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-01-29T18:23:38Z","title":"Probing the Sound Speed of Dark Energy with a Lunar Laser Interferometer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.22084","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":"sha256:364f74e4c7e23f85f2d7dae435452ceaac55f8027323604f7f214ed92c4f3f83","target":"record","created_at":"2026-07-02T00:18:27Z","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":"f87d910008b62b51296a4084f85a3cf93c9671f5c59ec71830d6b865706a1a4a","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-01-29T18:23:38Z","title_canon_sha256":"ed74609c22e0fe3e442e1f97b42f3a9acb7361b153ad7af95b4dd87e90c16556"},"schema_version":"1.0","source":{"id":"2601.22084","kind":"arxiv","version":1}},"canonical_sha256":"23ae42651900a1be99246bbc3a79d685a35f5d8ac34a1ebaaea0615262e92be2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"23ae42651900a1be99246bbc3a79d685a35f5d8ac34a1ebaaea0615262e92be2","first_computed_at":"2026-07-02T00:18:27.044242Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-02T00:18:27.044242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l/kMoE0Mpg5GacDEzfXcyKABcg3OXXb4ne4nAPnaIK0hKaDyXo1kR+/PNZxFa99O3z45oBu3qOp29waIwrB7AA==","signature_status":"signed_v1","signed_at":"2026-07-02T00:18:27.044860Z","signed_message":"canonical_sha256_bytes"},"source_id":"2601.22084","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:364f74e4c7e23f85f2d7dae435452ceaac55f8027323604f7f214ed92c4f3f83","sha256:882207d3720c30ece9cb7ba11201f03990e256900f51c0c11a9a0910ae4d9d91"],"state_sha256":"8648af75816a6c869b3c764dc06a983e2260868620ffb01e160e0edd0982c6c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zQ9UGdJXukURlmCv10mXXz4T2l8esxFx0Ts6LMjfsZ0twczx2hxeic255yGnBSpqBgNmM6KYITogGTO2EkJYCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T22:08:15.884718Z","bundle_sha256":"b628bbc22231b5bad1c12f717d6f17c6e1097d72a48366000e500655cc2a96c0"}}