Listar por autoría "c6ecd27b-3743-4042-86df-6fe7aa5aa615"
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Analytic integrability of the Bianchi class A cosmological models with O~ 1< < 1
Ferragut, Antoni; Llibre, Jaume; Pantazi, Chara Elsevier (2013-03)Many works study the integrability of the Bianchi class A cosmologies with k = 1, where k is the ratio between the pressure and the energy density of the matter. Here we characterize the analytic integrability of the Bianchi ... -
Cofactors and equilibria for polynomial vector fields
Ferragut, Antoni; Llibre, Jaume Cambridge University Press (2014)We present a relationship between the existence of equilibrium points of differential systems and the cofactors of the invariant algebraic curves and the exponential factors of the system -
On the absence of analytic integrability of the Bianchi Class B cosmological models
Ferragut, Antoni; Llibre, Jaume; Pantazi, Chara American Institute of Physics (AIP) (2013-02-15)We follow Bogoyavlensky's approach to deal with Bianchi class B cosmological models. We characterize the analytic integrability of such systems.