---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '21981'
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.
article_number: '105878'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Viacheslav
  full_name: Goncharov, Viacheslav
  id: 8a0e2993-7114-11f0-b60e-f50e633649d8
  last_name: Goncharov
citation:
  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>
  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>
  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>.
  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.
  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.
  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>.
  short: V. Goncharov, Journal of Geometry and Physics 227 (2026).
corr_author: '1'
date_created: 2026-06-10T07:29:13Z
date_published: 2026-05-21T00:00:00Z
date_updated: 2026-06-16T09:23:39Z
day: '21'
ddc:
- '000'
department:
- _id: GradSch
doi: 10.1016/j.geomphys.2026.105878
external_id:
  arxiv:
  - '2509.16169'
has_accepted_license: '1'
intvolume: '       227'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1016/j.geomphys.2026.105878
month: '05'
oa: 1
oa_version: Published Version
publication: Journal of Geometry and Physics
publication_identifier:
  eissn:
  - 1879-1662
  issn:
  - 0393-0440
publication_status: epub_ahead
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: An easier way to compute 2-cocycles coming from a reduction for semidirect
  products
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 227
year: '2026'
...