The properties of the quark — gluon medium observed in high-energy nucleus — nucleus collisions are discussed. The main experimental facts about these collisions are briefly described and compared with data about proton — proton collisions. Both microscopic and macroscopic approaches to their description are reviewed. The chromodynamics of the quark — gluon medium at high energies is mainly considered. The energy loss of partons moving in this medium is treated. The principal conclusion is that the medium possesses some collective properties which are crucial for understanding the experimental observations.

PACS: 12.38.Mh, 24.85.+p, 41.60.Bq (all) DOI: 10.3367/UFNe.0180.201011c.1167 URL: https://ufn.ru/en/articles/2010/11/d/ 000287186300004 2-s2.0-79955608197 Citation: Dremin I M, Leonidov A V "The quark — gluon medium" Phys. Usp. 53 1123–1149 (2010) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Дремин И М, Леонидов А В «Кварк-глюонная среда» УФН 180 1167–1196 (2010); DOI: 10.3367/UFNr.0180.201011c.1167