@Article{MuellerAlveArau:2014:IsPrQu,
author = "Mueller, Daniel and Alves, Marcio E. S. and Araujo, Jose Carlos
Neves de",
affiliation = "Campus Univ Darcy Ribeiro, Inst Fis UnB, BR-70919970 Brasilia, DF,
Brazil. and Univ Fed Itajuba, Inst Fis \& Quim, BR-37500 Itajuba,
MG, Brazil. and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "The isotropization process in the quadratic gravity",
journal = "International Journal of Modern Physics D",
year = "2014",
volume = "23",
number = "2",
month = "Feb.",
keywords = "Gravitational waves, cosmology, modified gravity.",
abstract = "It is believed that soon after the Planck era, spacetime should
have a semi-classical nature. Therefore, it is unavoidable to
modify the theory of general relativity or look for alternative
theories of gravitation. An interesting possibility found in the
literature considers two geometric counter-terms to regularize the
divergences of the effective action. These counter-terms are
responsible for a higher-order derivative metric theory of
gravitation. In the present paper, we investigate how
isotropization occurs. For this reason a single solution is chosen
throughout this paper. We obtain perturbatively, by two different
methods, that the tensor and scalar components emerge naturally
during the isotropization process. In this sense our result
provides a numerical example to Stelle's well-known result on
classical gravity with higher derivates. Our entire analysis is
restricted to the particular Bianchi type I case.",
doi = "10.1142/S0218271814500199",
url = "http://dx.doi.org/10.1142/S0218271814500199",
issn = "0218-2718",
label = "isi 2014-05 MuellerAlveArau:2014:ISPRQU",
language = "en",
targetfile = "S0218271814500199.pdf",
urlaccessdate = "04 maio 2024"
}