Virial theorem and gravitational equilibrium with a cosmological constant
Starting from the Newtonian limit of Einstein's equations in the presence of a positive cosmological constant, we obtain a new version of the virial theorem and a condition for gravitational equilibrium. Such a condition takes the form ρ and gt; λρvac, where ρ is the mean density of an astrophy...
- Autores:
-
Nowakowski, Marek
Sanabria, Juan Carlos
García, Alejandro
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2001
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/70649
- Acceso en línea:
- https://repositorio.unal.edu.co/handle/unal/70649
http://bdigital.unal.edu.co/35119/
- Palabra clave:
- Constante cosmológica
densidad
galaxias
- Rights
- openAccess
- License
- Atribución-NoComercial 4.0 Internacional
| Summary: | Starting from the Newtonian limit of Einstein's equations in the presence of a positive cosmological constant, we obtain a new version of the virial theorem and a condition for gravitational equilibrium. Such a condition takes the form ρ and gt; λρvac, where ρ is the mean density of an astrophysical system (e.g. galaxy, galaxy cluster or supercluster), λ is a quantity which depends only on the shape of the system, and ρvac is the vacuum density. We conclude that gravitational stability might be infiuenced by the presence of Λ depending strongly on the shape of the system. |
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