Analytical solutions in R + qRn cosmology from singularity analysis

The integrability of higher-order theories of gravity is of importance in the determining the properties of these models and so their viability as models of reality. An important tool in the establishment of integrability is the singularity analysis. We apply this analysis to the case of fourth-order theory of gravity f (R) = R + qR(n) to establish those values of the free parameters q and n for which integrability in this sense exists. As a preliminary we examine the well-known case of n = 4/3. (C) 2016 Elsevier B.V. All rights reserved.