Large-scale inhomogeneities in modified Chaplygin gas cosmologies

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We extend the homogeneous modified Chaplygin cosmologies to large-scale perturbations by formulating a Zeldovich-like approximation. We show that the model interpolates between an epoch with a soft equation of state and a de Sitter phase, and that in the intermediate regime its matter content is sim...

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Detalles Bibliográficos
Autores principales: Chimento, L.P., Lazkoz, R.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2005
Materias:
article
chemical modification
cold
cosmos
darkness
gas
molecular model
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03702693_v615_n3-4_p146_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:We extend the homogeneous modified Chaplygin cosmologies to large-scale perturbations by formulating a Zeldovich-like approximation. We show that the model interpolates between an epoch with a soft equation of state and a de Sitter phase, and that in the intermediate regime its matter content is simply the sum of dust and a cosmological constant. We then study how the large-scale inhomogeneities evolve and compare the results with cold dark matter (CDM), ΛCDM and generalized Chaplygin scenarios. We find that unlike that like the latter, our models resemble ΛCDM. © 2005 Elsevier B.V. All rights reserved.

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