Simplicial presheaves and derived algebraic geometry. Bertrand Toen To cite this version: Bertrand Toen. Simplicial presheaves and derived algebraic geometry.. Simplicial Methods for Operads and Algebraic Geometry, Springer Basel, pp.119-185, 2010, Advanced Courses in Mathematics - CRM Barcelona, 978-3-0348-0051-8. 10.1007/978-3-0348-0052-5. hal-00772850v2 HAL Id: hal-00772850 https://hal.archives-ouvertes.fr/hal-00772850v2 Submitted on 18 Feb 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Simplicial presheaves and derived algebraic geometry Bertrand To¨en I3M, Universit´ede Montpellier 2 Case Courrier 051 Place Eug`ene Bataillon 34095 Montpellier Cedex, France e-mail:
[email protected] Mai 2009 2 Contents 1 Motivations and objectives 5 1.1 The notion of moduli spaces . 5 1.2 Construction of moduli spaces: one example . 6 1.3 Conclusions . 10 2 Simplicial presheaves as stacks 11 2.1 Review of the model category of simplicial presheaves . 11 2.2 Basic examples . 17 3 Algebraic stacks 27 3.1 Schemes and algebraic n-stacks . 28 3.2 Some examples . 31 3.3 Coarse moduli spaces and homotopy sheaves .