{"paper":{"title":"When Bumblebee Meets NLED: Lorentz-Violating Black Holes and Regular Spacetimes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Fine-tuning mass and charge in bumblebee gravity with nonlinear electrodynamics removes central singularities to produce regular horizonless spacetimes.","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"H.Lu, Zhi-Chao Li","submitted_at":"2026-05-13T18:00:02Z","abstract_excerpt":"We construct charged black hole solutions in bumblebee gravity coupled to a general class of nonlinear electrodynamics (NLED) using an auxiliary Maxwell-scalar formalism. The norm-fixed radial configuration of the bumblebee vector makes the solutions asymptotic to a conical Lorentz-violating vacuum and requires stringent nonminimal bumblebee-NLED couplings. The general black hole solutions contain independent mass and charge parameters. There are two sources of singular behavior at the center: one is due to the Schwarzschild-type pole and the other is the residual conical singularity of the Lo"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"By fine-tuning the mass-charge relation, one can generally remove the pole singularity, giving rise to marginally regular black holes. For a suitable NLED theory such as Born-Infeld theory, both singularity sources can be removed at the cost of requiring both the mass and the charge to be fine-tuned to specific functions of the coupling constants. The resulting solutions describe regular horizonless spacetimes interpolating from AdS or dS cores to Lorentz-violating vacua.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The norm-fixed radial configuration of the bumblebee vector makes the solutions asymptotic to a conical Lorentz-violating vacuum and requires stringent nonminimal bumblebee-NLED couplings.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Bumblebee gravity coupled to NLED yields charged black hole solutions that become regular and horizonless when mass and charge are tuned to specific functions of the couplings.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Fine-tuning mass and charge in bumblebee gravity with nonlinear electrodynamics removes central singularities to produce regular horizonless spacetimes.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"2bd06a0f010bd151d5b835173cbd1aaa7a0a3c3bbf55fe8ad6edd652b0e26970"},"source":{"id":"2605.13963","kind":"arxiv","version":1},"verdict":{"id":"6319b424-37e8-436c-845c-41f2380ef424","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:39:01.555513Z","strongest_claim":"By fine-tuning the mass-charge relation, one can generally remove the pole singularity, giving rise to marginally regular black holes. For a suitable NLED theory such as Born-Infeld theory, both singularity sources can be removed at the cost of requiring both the mass and the charge to be fine-tuned to specific functions of the coupling constants. The resulting solutions describe regular horizonless spacetimes interpolating from AdS or dS cores to Lorentz-violating vacua.","one_line_summary":"Bumblebee gravity coupled to NLED yields charged black hole solutions that become regular and horizonless when mass and charge are tuned to specific functions of the couplings.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The norm-fixed radial configuration of the bumblebee vector makes the solutions asymptotic to a conical Lorentz-violating vacuum and requires stringent nonminimal bumblebee-NLED couplings.","pith_extraction_headline":"Fine-tuning mass and charge in bumblebee gravity with nonlinear electrodynamics removes central singularities to produce regular horizonless spacetimes."},"references":{"count":33,"sample":[{"doi":"","year":1989,"title":"Spontaneous breaking of Lorentz symmetry in string theory,","work_id":"6fb29ff2-c4bf-4af8-8bc4-f33366ad9ad3","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2011,"title":"Data Tables for Lorentz and CPT Violation","work_id":"90080d68-8251-4b28-acb2-241c290dd0fd","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2005,"title":"Modern tests of Lorentz invariance,","work_id":"0acbb425-1ba8-438a-9575-e2de2a287154","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2006,"title":"Signals for Lorentz Violation in Post-Newtonian Gravity","work_id":"5370cb90-44e4-4bc4-9119-9a9149755325","ref_index":4,"cited_arxiv_id":"gr-qc/0603030","is_internal_anchor":true},{"doi":"","year":2005,"title":"Spontaneous Lorentz Violation, Nambu-Goldstone Modes, and Gravity","work_id":"6393209f-0287-4558-bcc0-a937a13a7d3e","ref_index":5,"cited_arxiv_id":"hep-th/0412320","is_internal_anchor":true}],"resolved_work":33,"snapshot_sha256":"fd90c167712c79bd19db7ff02fadceaf5f373d8d4667d0f0645b02c057e6b019","internal_anchors":19},"formal_canon":{"evidence_count":2,"snapshot_sha256":"1878fcf07a9e09cfc8eabb5d1b98e2626f1a536614cdae49b8c0ed86d7ec2c65"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}