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Título:
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Covariant gauge-invariant perturbations in multifluid f (R) gravity
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Autores:
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Abebe, Amare ;
Abdelwahab, Mohamed ;
Cruz Dombriz, Álvaro de la ;
Dunsby, Peter K. S.
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Tipo de documento:
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texto impreso
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Editorial:
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Institute of Physics, 2012-07-07
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física
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Tipo = Artículo
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Resumen:
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We study the evolution of scalar cosmological perturbations in the 1 + 3 covariant gauge-invariant formalism for generic f(R) theories of gravity. Extending previous works, we give a complete set of equations describing the evolution of matter and curvature fluctuations for a multi-fluid cosmological medium. We then specialize to a radiation-dust fluid described by barotropic equations of state and solve the perturbation equations around a background solution of R^n gravity. In particular, we study exact solutions for scales much smaller and much larger than the Hubble radius and show that n > 2/3 in order to have a growth rate compatible with the Mészáros effect.
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En línea:
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https://eprints.ucm.es/id/eprint/28892/1/Cruz-Dombriz12preprint.pdf
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