{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GHJNDEMYIDUEEBPLZGUOH7T3GL","short_pith_number":"pith:GHJNDEMY","canonical_record":{"source":{"id":"1812.09177","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-12-21T15:06:27Z","cross_cats_sorted":[],"title_canon_sha256":"ef0421f196775fe05fce88b32824512b2e6ac4091612c59550124ad126cd5fb3","abstract_canon_sha256":"0ac3f47d28dda60d4818b13a651a6dd26dda2e1c4e6507df89136e75c05099f8"},"schema_version":"1.0"},"canonical_sha256":"31d2d1919840e84205ebc9a8e3fe7b32f07c73f9414907d5eb55c204a421835e","source":{"kind":"arxiv","id":"1812.09177","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.09177","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"arxiv_version","alias_value":"1812.09177v1","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.09177","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"pith_short_12","alias_value":"GHJNDEMYIDUE","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GHJNDEMYIDUEEBPL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GHJNDEMY","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GHJNDEMYIDUEEBPLZGUOH7T3GL","target":"record","payload":{"canonical_record":{"source":{"id":"1812.09177","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-12-21T15:06:27Z","cross_cats_sorted":[],"title_canon_sha256":"ef0421f196775fe05fce88b32824512b2e6ac4091612c59550124ad126cd5fb3","abstract_canon_sha256":"0ac3f47d28dda60d4818b13a651a6dd26dda2e1c4e6507df89136e75c05099f8"},"schema_version":"1.0"},"canonical_sha256":"31d2d1919840e84205ebc9a8e3fe7b32f07c73f9414907d5eb55c204a421835e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:08.105339Z","signature_b64":"XbGq/qUX9te09lmI2Q4WjYAIdfd/uIRvNoDKm+CS4b2jhKlunrytmtZEz4l2gX4ckGWepAqG/HqAj/0uoETYCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31d2d1919840e84205ebc9a8e3fe7b32f07c73f9414907d5eb55c204a421835e","last_reissued_at":"2026-05-17T23:54:08.104945Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:08.104945Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.09177","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":"2026-05-17T23:54:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B96/jZaMqr+sA/crb81sJf7QXxqmjIuA/2i5CJdBLPZwc9Gyd96r3QKfxGddTcSBa5/mVbBPAW0yMQLBEoRXCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:48:41.430967Z"},"content_sha256":"89a66a00637f566584026c7eca34b2c7d10e0d2d6f9d30671d32220353efef78","schema_version":"1.0","event_id":"sha256:89a66a00637f566584026c7eca34b2c7d10e0d2d6f9d30671d32220353efef78"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GHJNDEMYIDUEEBPLZGUOH7T3GL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cooling All External Degrees of Freedom of Optically Trapped Chromium Atoms Using Gray Molasses","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"B. Laburthe-Tolra, L. Gabardos, L. Vernac, O. Gorceix, S. Lepoutre","submitted_at":"2018-12-21T15:06:27Z","abstract_excerpt":"We report on a scheme to cool and compress trapped clouds of highly magnetic 52Cr atoms. This scheme combines sequences of gray molasses, which freeze the velocity distribution, and free evolutions in the (close to) harmonic trap, which periodically exchange the spatial and velocity degrees of freedom. Taken together, the successive gray molasses pulses cool all external degrees of freedom, which leads to an increase of the phase-space density (PSD) by a factor of about 250, allowing to reach a high final PSD of about 1.7*10^-3. These experiments are performed within an optical dipole trap, in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.09177","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":"2026-05-17T23:54:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sVQ6/gCR89+wexNIILKQ40tzfxfQyw1mvyCUxEF8GZZmth9gATSQynSIUM19FG3rz4ILhd5s34GcsQJoFypDDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:48:41.431311Z"},"content_sha256":"99098e604740532a22b2eedafb218e959fe4bf6f15c708f15f6792776534af7a","schema_version":"1.0","event_id":"sha256:99098e604740532a22b2eedafb218e959fe4bf6f15c708f15f6792776534af7a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/bundle.json","state_url":"https://pith.science/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/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":"2026-05-30T18:48:41Z","links":{"resolver":"https://pith.science/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL","bundle":"https://pith.science/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/bundle.json","state":"https://pith.science/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GHJNDEMYIDUEEBPLZGUOH7T3GL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GHJNDEMYIDUEEBPLZGUOH7T3GL","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":"0ac3f47d28dda60d4818b13a651a6dd26dda2e1c4e6507df89136e75c05099f8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-12-21T15:06:27Z","title_canon_sha256":"ef0421f196775fe05fce88b32824512b2e6ac4091612c59550124ad126cd5fb3"},"schema_version":"1.0","source":{"id":"1812.09177","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.09177","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"arxiv_version","alias_value":"1812.09177v1","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.09177","created_at":"2026-05-17T23:54:08Z"},{"alias_kind":"pith_short_12","alias_value":"GHJNDEMYIDUE","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GHJNDEMYIDUEEBPL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GHJNDEMY","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:99098e604740532a22b2eedafb218e959fe4bf6f15c708f15f6792776534af7a","target":"graph","created_at":"2026-05-17T23:54:08Z","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":"We report on a scheme to cool and compress trapped clouds of highly magnetic 52Cr atoms. This scheme combines sequences of gray molasses, which freeze the velocity distribution, and free evolutions in the (close to) harmonic trap, which periodically exchange the spatial and velocity degrees of freedom. Taken together, the successive gray molasses pulses cool all external degrees of freedom, which leads to an increase of the phase-space density (PSD) by a factor of about 250, allowing to reach a high final PSD of about 1.7*10^-3. These experiments are performed within an optical dipole trap, in","authors_text":"B. Laburthe-Tolra, L. Gabardos, L. Vernac, O. Gorceix, S. Lepoutre","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-12-21T15:06:27Z","title":"Cooling All External Degrees of Freedom of Optically Trapped Chromium Atoms Using Gray Molasses"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.09177","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":"sha256:89a66a00637f566584026c7eca34b2c7d10e0d2d6f9d30671d32220353efef78","target":"record","created_at":"2026-05-17T23:54:08Z","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":"0ac3f47d28dda60d4818b13a651a6dd26dda2e1c4e6507df89136e75c05099f8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-12-21T15:06:27Z","title_canon_sha256":"ef0421f196775fe05fce88b32824512b2e6ac4091612c59550124ad126cd5fb3"},"schema_version":"1.0","source":{"id":"1812.09177","kind":"arxiv","version":1}},"canonical_sha256":"31d2d1919840e84205ebc9a8e3fe7b32f07c73f9414907d5eb55c204a421835e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31d2d1919840e84205ebc9a8e3fe7b32f07c73f9414907d5eb55c204a421835e","first_computed_at":"2026-05-17T23:54:08.104945Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:08.104945Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XbGq/qUX9te09lmI2Q4WjYAIdfd/uIRvNoDKm+CS4b2jhKlunrytmtZEz4l2gX4ckGWepAqG/HqAj/0uoETYCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:08.105339Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.09177","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:89a66a00637f566584026c7eca34b2c7d10e0d2d6f9d30671d32220353efef78","sha256:99098e604740532a22b2eedafb218e959fe4bf6f15c708f15f6792776534af7a"],"state_sha256":"c2cc868e68d4139f2fc71c91fac04dc7a36ecfcb6e15a3ad908bc26339355144"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m4pT7DEsBi/dbSxB4yqXRhWG/o5f0L8YH7rrd7S9msbMpI7nUbKoPcPo3TSRUpqh8PGfmv+vN8R1NpadZIOdDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:48:41.433242Z","bundle_sha256":"8e83c22193d9a125edf9047904a25d403fa416072f356e8e62f229c62206313f"}}