{"work":{"id":"b335030a-2437-4e94-bf45-14b54dc22d76","openalex_id":null,"doi":null,"arxiv_id":"0710.4344","raw_key":null,"title":"Black Hole Bound on the Number of Species and Quantum Gravity at LHC","authors":null,"authors_text":"G","year":2007,"venue":"hep-th","abstract":"In theories with a large number N of particle species, black hole physics imposes an upper bound on the mass of the species equal to M_{Planck}/\\sqrt{N}. This bound suggests a novel solution to the hierarchy problem in which there are N \\approx 10^{32} gravitationally coupled species, for example 10^{32} copies of the Standard Model. The black hole bound forces them to be at the weak scale, hence providing a stable hierarchy. We present various arguments, that in such theories the effective gravitational cutoff is reduced to \\Lambda_G \\approx M_{Planck}/\\sqrt{N} and a new description is needed around this scale. In particular black-holes smaller than \\Lambda_G^{-1} are already no longer semi-classical. The nature of the completion is model dependent. One natural possibility is that \\Lambda_G is the quantum gravity scale. We provide evidence that within this type of scenarios, contrary to the standard intuition, micro black holes have a (slowly-fading) memory of the species of origin. Consequently the black holes produced at LHC, will predominantly decay into the Standard Model particles, and negligibly into the other species.","external_url":"https://arxiv.org/abs/0710.4344","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-04T20:50:10.986493+00:00","pith_arxiv_id":"0710.4344","created_at":"2026-05-09T06:45:44.997027+00:00","updated_at":"2026-07-04T20:50:10.986493+00:00","title_quality_ok":true,"display_title":"Black Hole Bound on the Number of Species and Quantum Gravity at LHC","render_title":"Black Hole Bound on the Number of Species and Quantum Gravity at LHC"},"hub":{"state":{"work_id":"b335030a-2437-4e94-bf45-14b54dc22d76","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":15,"external_cited_by_count":null,"distinct_field_count":3,"first_pith_cited_at":"2025-02-13T17:55:16+00:00","last_pith_cited_at":"2026-06-29T18:21:28+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-08-18T15:00:15.190515+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":8}],"polarity_counts":[{"context_polarity":"background","n":8}],"runs":{},"summary":{},"graph":{},"authors":[]}}