Browsing by Author "Paliathanasis, A"
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Cosmological solutions with gravitational particle production and nonzero curvature
Paliathanasis, A; Barrow, John David; Pan, S (American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-05-26)In a homogeneous and isotropic universe with nonzero spatial curvature we consider the effects of gravitational particle production in the dynamics of the universe. We show that the dynamics of the universe in such a ...
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Dynamical symmetries in Brans-Dicke cosmology
Papagiannopoulos, G; Barrow, John David; Basilakos, S; Giacomini, A; Paliathanasis, A (American Physical SocietyPhysical Review D, 2017-01-20)In the context of generalized Brans-Dicke cosmology we use the Killing tensors of the minisuperspace in order to determine the unspecified potential of a scalar-tensor gravity theory. Specifically, based on the existence ...
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Observational constraints on new exact inflationary scalar-field solutions
Barrow, John David; Paliathanasis, A (American Physical SocietyPhysical Review D, 2016-10-15)An algorithm is used to generate new solutions of the scalar-field equations in homogeneous and isotropic universes. Solutions can be found for pure scalar fields with various potentials in the absence and presence of ...