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On the Non-integrability of a Class of Hamiltonian Cosmological Models
the Non-integrability Hamiltonian Cosmological Models
2010/10/15
The method of Morales and Ramis determines whether a given Hamiltonian system is non-integrable. We apply this method to Friedmann Robertson Walker models with a self-interacting scalar field and cosm...
Phase Space Solutions in Scalar-Tensor Cosmological Models
Phase Space Solutions Scalar-Tensor Cosmological Models
2010/10/15
An analysis of the solutions for the field equations of generalized scalar-tensor theories of gravitation is performed through the study of the geometry of the phase space and the stability of the sol...
Remarks on Some Vacuum Solutions of Scalar-Tensor Cosmological Models
Vacuum Solutions Scalar-Tensor Cosmological Models
2010/10/21
We present a class of exact vacuum solutions corresponding to de Sitter and warm inflation models in the framework of scalar-tensor cosmologies. We show that in both cases the field equations reduce t...
Some String Cosmological Models in Cylindrically Symmetric Inhomogeneous Universe
String Cosmological Models
2010/4/15
The aim of this paper is to investigate the behavior of a string in the cylindrically symmetric inhomogeneous cosmological model. It has been assumed that expansion q in the model is proportional to s...
Chaos in Closed Isotropic Cosmological Models with Steep Scalar Field Potential
Closed Isotropic Cosmological Steep Scalar Field Potential
2010/4/15
The dynamics of closed scalar field FRW cosmological models is studied for several types of exponentially and more than exponentially steep potentials. The parameters of scalar field potentials which ...