{"paper":{"title":"Pulsar-Black Hole Binaries in the Galactic Center","arxiv_id":"1012.0573","primary_cat":"astro-ph.HE","submitted_at":"2010-12-02T21:00:21+00:00","version_compiled":"v2"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13-20260917 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v2","sentences":[{"i":0,"p":1.0,"id":"s0","own":false,"role":"background","text":"Binaries consisting of a pulsar and a black hole (BH) are a holy grail of astrophysics, both for their significance for stellar evolution and for their potential application as probes of strong gravity.","hedge":{"p":0.99,"label":"asserted"},"own_p":0.04,"main_claim_p":0.04,"quantitative":false,"quantitative_p":0.06,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":1.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":1,"p":0.92,"id":"s1","own":false,"role":"gap","text":"In spite of extensive surveys of our Galaxy and its system of globular clusters, no pulsar-black hole (PSR-BH) binary has been found to date.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.05,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.29,"role_probabilities":{"gap":0.92,"method":0.0,"result":0.0,"background":0.08,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":2,"p":0.61,"id":"s2","own":false,"role":"gap","text":"Clues as to where such systems might exist are therefore highly desirable.","hedge":{"p":0.78,"label":"asserted"},"own_p":0.04,"main_claim_p":0.02,"quantitative":false,"quantitative_p":0.03,"role_probabilities":{"gap":0.61,"method":0.0,"result":0.0,"background":0.37,"limitation":0.0,"future_work":0.02,"contribution":0.0,"interpretation":0.0}},{"i":3,"p":0.85,"id":"s3","own":true,"role":"contribution","text":"We show that if the central parsec around Sgr A* harbors a cluster of ~25,000 stellar BHs (as predicted by mass segregation arguments) and if it is also rich in recycled pulsar binaries (by analogy with globular clusters), then 3-body exchange interactions should produce PSR-BHs in the Galactic center.","hedge":{"p":0.71,"label":"asserted"},"own_p":0.74,"main_claim_p":0.6,"quantitative":true,"quantitative_p":0.97,"role_probabilities":{"gap":0.0,"method":0.07,"result":0.08,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.85,"interpretation":0.0}},{"i":4,"p":0.97,"id":"s4","own":true,"role":"result","text":"Simple estimates of the formation rate and survival time of these binaries suggest that a few PSR-BHs should be present in the central parsec today.","hedge":{"p":0.96,"label":"hedged_possibility"},"own_p":0.76,"main_claim_p":0.24,"quantitative":true,"quantitative_p":0.77,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.97,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.02}},{"i":5,"p":0.73,"id":"s5","own":true,"role":"result","text":"The proposed formation mechanism makes unique predictions for the PSR-BH properties: 1) the binary would reside within ~1 pc of Sgr A*; 2) the pulsar would be recycled, with a period of ~1 to a few tens of milliseconds, and a low magnetic field B<~10^10 G; 3) the binary would have high eccentricity, e~0.8, but with a large scatter; and 4) the binary would be relatively wide, with semi-major axis a_b~0.1 - >~3 AU.","hedge":{"p":0.94,"label":"asserted"},"own_p":0.63,"main_claim_p":0.22,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.73,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.07,"interpretation":0.2}},{"i":6,"p":0.93,"id":"s6","own":false,"role":"future_work","text":"The potential discovery of a PSR-BH binary therefore provides a strong motivation for deep, high-frequency radio searches for recycled pulsars toward the Galactic center.","hedge":{"p":0.78,"label":"asserted"},"own_p":0.08,"main_claim_p":0.25,"quantitative":false,"quantitative_p":0.05,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.93,"contribution":0.0,"interpretation":0.07}}]},"compiled":{"main_claim":{"p":0.52,"text":"We show that if the central parsec around Sgr A* harbors a cluster of ~25,000 stellar BHs (as predicted by mass segregation arguments) and if it is also rich in recycled pulsar binaries (by analogy with globular clusters), then 3-body exchange interactions should produce PSR-BHs in the Galactic center.","location":"abstract s3","hedge_strength":{"p":0.71,"label":"asserted"}},"provenance":{"route":{"via":"OpenRouter","model":"classifier-1.13","endpoint":"https://openrouter.ai/api/v1/systemone","provider":"TypeSafe"},"packing":"one request per paper","requests":1,"input_tokens":5915,"cost_usd_reported":0.000248},"compiled_at":"2026-09-23","bank_version":"abstract-p1-20260923","model_version":"classifier-1.13-20260917","abstract_states":{"claims_first":0.07,"states_limitation":0.34,"human_participants":0.01,"controlled_comparison":0.03,"randomized_assignment":0.01,"states_quantitative_result":0.95,"compares_with_prior_results":0.2,"mentions_code_or_data_availability":0.01},"evidential_basis":{"p":0.96,"value":"argument","probabilities":{"argument":0.96,"literature":0.0,"proof_or_derivation":0.03,"analysis_of_existing_data":0.0,"observation_or_experiment":0.0,"simulation_or_computation":0.01}},"contribution_type":{"p":0.93,"value":"theoretical result","probabilities":{"review":0.0,"method_or_tool":0.0,"empirical_study":0.0,"simulation_study":0.0,"theoretical_result":0.93,"dataset_or_benchmark":0.0,"position_or_commentary":0.07}},"contribution_statement":{"p":1.0,"text":"We show that if the central parsec around Sgr A* harbors a cluster of ~25,000 stellar BHs (as predicted by mass segregation arguments) and if it is also rich in recycled pulsar binaries (by analogy with globular clusters), then 3-body exchange interactions should produce PSR-BHs in the Galactic center.","location":"abstract s3"}},"coverage":{"tier":"abstract","levels_run":["P abstract"],"not_examined":["full text","figures and tables","references and citing sentences","relations to other papers"],"sources_read":["arXiv listing abstract v2"],"levels_not_run":["S sections","T body sentences","C citations","R cross-paper relations"],"sentences_examined":7,"sentences_in_abstract":7},"measured_accuracy":{"url":"https://pith.science/accuracy","measured_on":"2026-10-02","method":"two independent model families labelled a fresh random sample blind; 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