{"title":"在一个大质量物体的场中由自身重力引起的粘性。","authors":"Ilia Yu Kalashnikov, Valery M Chechetkin","doi":"10.1103/PhysRevE.111.055102","DOIUrl":null,"url":null,"abstract":"<p><p>This study investigates self-gravity-induced viscosity in collisionless systems in the presence of a massive central body. Employing a kinetic framework based on the Vlasov-Poisson equations, we derive an analytical expression for viscosity arising from self-gravitational interactions. It is found that a self-gravitating medium in an external gravitational field exhibits non-Newtonian fluid behavior with anisotropic properties. The analysis emphasizes how self-gravity modifies hydrodynamic processes, particularly in driving the loss of angular momentum. These findings advance our understanding of collective gravitational effects in collisionless environments, offering potential implications for modeling dark matter dynamics, galactic structure formation, and the evolution of self-gravitating accretion flows.</p>","PeriodicalId":48698,"journal":{"name":"Physical Review E","volume":"111 5-2","pages":"055102"},"PeriodicalIF":2.4000,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Viscosity caused by self-gravity in the field of a massive body.\",\"authors\":\"Ilia Yu Kalashnikov, Valery M Chechetkin\",\"doi\":\"10.1103/PhysRevE.111.055102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>This study investigates self-gravity-induced viscosity in collisionless systems in the presence of a massive central body. Employing a kinetic framework based on the Vlasov-Poisson equations, we derive an analytical expression for viscosity arising from self-gravitational interactions. It is found that a self-gravitating medium in an external gravitational field exhibits non-Newtonian fluid behavior with anisotropic properties. The analysis emphasizes how self-gravity modifies hydrodynamic processes, particularly in driving the loss of angular momentum. These findings advance our understanding of collective gravitational effects in collisionless environments, offering potential implications for modeling dark matter dynamics, galactic structure formation, and the evolution of self-gravitating accretion flows.</p>\",\"PeriodicalId\":48698,\"journal\":{\"name\":\"Physical Review E\",\"volume\":\"111 5-2\",\"pages\":\"055102\"},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2025-05-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physical Review E\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1103/PhysRevE.111.055102\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, FLUIDS & PLASMAS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review E","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/PhysRevE.111.055102","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, FLUIDS & PLASMAS","Score":null,"Total":0}
Viscosity caused by self-gravity in the field of a massive body.
This study investigates self-gravity-induced viscosity in collisionless systems in the presence of a massive central body. Employing a kinetic framework based on the Vlasov-Poisson equations, we derive an analytical expression for viscosity arising from self-gravitational interactions. It is found that a self-gravitating medium in an external gravitational field exhibits non-Newtonian fluid behavior with anisotropic properties. The analysis emphasizes how self-gravity modifies hydrodynamic processes, particularly in driving the loss of angular momentum. These findings advance our understanding of collective gravitational effects in collisionless environments, offering potential implications for modeling dark matter dynamics, galactic structure formation, and the evolution of self-gravitating accretion flows.
期刊介绍:
Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.