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Cosmological Exact Solutions Set of a Perfect Fluid in an Anisotropic Space-Time in Petrov Type D

Artículo científico
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Versión final (321.1Kb)
Date
2016-06
Author
Alvarado Marín, Rodrigo Eduardo
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Abstract
In this document a set of exact solutions is obtained by using the model of a perfect fluid on an homogeneous and anisotropic space-time that belongs to (Local Rotational Symmetry) Petrov’s type D. This solutions represent the possible scenarios of a Universe for which the pressure P and the energetic density µ of a fluid are proportional (P = λµ), where λ can have any value. Hence, the aforementioned solution has importance for the fluid models with standard matter (λ ∈ [0, 1/3]), and also for other models, like quintessence, dark energy, phantom, ekpyrotic etc. It is established that for any state of the fluid, there are two possible solutions that depend on the matter expanding faster on a perpendicular coordinate on a plane, rather tan the plane itself, or if the situation is the opposite. Possible singularities are studied, and cases where the solutions are not singular in t = 0 are established; moreover, to the possibility for the solutions, depending of the t values, to become isotropic, pointing out that going from a model that was anisotropic at the beginning to an isotropic one with the augmentation of t, depends on whether the pressure P of the fluid is lower or not than the density of the energy µ.
URI
http://hdl.handle.net/10669/75297
External link to the item
10.12988/astp.2016.6311
http://www.m-hikari.com/astp/astp2016/astp5-8-2016/p/alvaradoASTP5-8-2016.pdf
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  • Repositorios universitarios

  • Repositorio del SIBDI-UCR
  • Biblioteca Digital del CIICLA
  • Repositorio Documental Rafael Obregón Loría (CIHAC)
  • Biblioteca Digital Carlos Melendez (CIHAC)
  • Repositorio de Fotografías
  • Colección de videos de UPA-VAS
  • Sitios recomendados

  • Buscador regional de LA Referencia
  • Buscador del Open ROAR
  • Scientific Electronic Library Online (SciELO)
  • Directory of Open Access Journals (DOAJ)
  • Redalyc
  • Redes sociales

  • facebook.com/repositoriokerwa
  • @Ciencia_UCR
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Contact Us | Send Feedback
Repositorio Institucional de la Universidad de Costa Rica. Algunos derechos reservados. Este repositorio funciona con DSpace.
Universidad de Costa Rica