@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 = "28 abr. 2024"
}