[{"arxiv":1,"date_created":"2026-06-10T07:29:13Z","article_number":"105878","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1016/j.geomphys.2026.105878"}],"article_type":"original","department":[{"_id":"GradSch"}],"date_updated":"2026-06-16T09:23:39Z","year":"2026","quality_controlled":"1","abstract":[{"lang":"eng","text":"For Hamiltonian actions of semidirect products G = FxH, we study 2-cocycles arising from residual Hamiltonian actions of F on Hamiltonian reductions for H. The motivation comes from the study of Teichmüller spaces for surfaces with boundary, which carry Hamiltonian actions of the Virasoro algebra. In this paper, we give a general setup for the problem, and we suggest an easier way to obtain the Gelfand-Fuchs 2-cocycles for Hamiltonian actions on Teichmüller spaces."}],"_id":"21981","OA_type":"hybrid","publication_identifier":{"issn":["0393-0440"],"eissn":["1879-1662"]},"article_processing_charge":"Yes (via OA deal)","citation":{"ista":"Goncharov V. 2026. An easier way to compute 2-cocycles coming from a reduction for semidirect products. Journal of Geometry and Physics. 227, 105878.","ama":"Goncharov V. An easier way to compute 2-cocycles coming from a reduction for semidirect products. <i>Journal of Geometry and Physics</i>. 2026;227. doi:<a href=\"https://doi.org/10.1016/j.geomphys.2026.105878\">10.1016/j.geomphys.2026.105878</a>","mla":"Goncharov, Viacheslav. “An Easier Way to Compute 2-Cocycles Coming from a Reduction for Semidirect Products.” <i>Journal of Geometry and Physics</i>, vol. 227, 105878, Elsevier, 2026, doi:<a href=\"https://doi.org/10.1016/j.geomphys.2026.105878\">10.1016/j.geomphys.2026.105878</a>.","ieee":"V. Goncharov, “An easier way to compute 2-cocycles coming from a reduction for semidirect products,” <i>Journal of Geometry and Physics</i>, vol. 227. Elsevier, 2026.","chicago":"Goncharov, Viacheslav. “An Easier Way to Compute 2-Cocycles Coming from a Reduction for Semidirect Products.” <i>Journal of Geometry and Physics</i>. Elsevier, 2026. <a href=\"https://doi.org/10.1016/j.geomphys.2026.105878\">https://doi.org/10.1016/j.geomphys.2026.105878</a>.","apa":"Goncharov, V. (2026). An easier way to compute 2-cocycles coming from a reduction for semidirect products. <i>Journal of Geometry and Physics</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.geomphys.2026.105878\">https://doi.org/10.1016/j.geomphys.2026.105878</a>","short":"V. Goncharov, Journal of Geometry and Physics 227 (2026)."},"OA_place":"publisher","oa_version":"Published Version","day":"21","oa":1,"tmp":{"image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"publication_status":"epub_ahead","volume":227,"ddc":["000"],"status":"public","intvolume":"       227","publisher":"Elsevier","date_published":"2026-05-21T00:00:00Z","author":[{"last_name":"Goncharov","full_name":"Goncharov, Viacheslav","first_name":"Viacheslav","id":"8a0e2993-7114-11f0-b60e-f50e633649d8"}],"title":"An easier way to compute 2-cocycles coming from a reduction for semidirect products","PlanS_conform":"1","language":[{"iso":"eng"}],"scopus_import":"1","has_accepted_license":"1","month":"05","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","corr_author":"1","type":"journal_article","publication":"Journal of Geometry and Physics","doi":"10.1016/j.geomphys.2026.105878","external_id":{"arxiv":["2509.16169"]}}]