Self-interacting scalar field trapped in a DGP brane: The dynamical systems perspective

Abstract

Some cobaltites with perovskite-type structure exhibit outstanding transport properties and high chemical activity, which make these materials suitable for applications in areas of gas sensors, heterogeneous catalysis, gas separation membranes and cathodes for solid oxide fuel cells. In this work, polycrystalline samples of Sm1-xBaxCoO3 (x = 0, 0.1) were prepared by an aqueous solution method using the corresponding nitrates. X-ray diffraction patterns of calcined samples showed that single-phase SmCoO3 was obtained at 900°C, whereas Sm 0.9Ba0.1CoO3 was formed at 700°C. Electron microscopy images revealed that micron-sized particles were obtained for SmCoO3, whereas a nanostructured and nanoporous material was observed for Sm0.9Ba0.1CoO3. Electrical measurements made on thick films of the oxides revealed a semiconductor behavior in both phases, however Sm0.9Ba0.1CoO3 samples showed a larger conductivity compared with SmCoO3 dynamic response of resistance experiments made in air and CO2 revealed that Sm 0.9Ba0.1CoO3 is selective to CO2. " 2005 Materials Research Society.",,,,,,,,,"http://hdl.handle.net/20.500.12104/44459","http://www.scopus.com/inward/record.url?eid=2-s2.0-34249994051&partnerID=40&md5=2cab5e85b17628cdea5e7b6b88df2273",,,,,,,,"Materials Research Society Symposium Proceedings",,"126

131",,"876",,"Scopus",,,,,,,,,,,,"Sensing properties of nanostructured Sm1-xBaxCoO 3 (x = 0, 0.1) obtained by solution method",,"Conference Paper" "46222","123456789/35008",,"Quiros, I., Departamento de Física, Universidad Central de Las Villas, 54830 Santa Clara, Cuba; García-Salcedo, R., Centro de Investigación en Ciencia Aplicada y Tecnologia Avanzada-Legaria, IPN, México D.F., Mexico; Matos, T., Departamento de Física, Centro de Investigación y de Estudios Avanzados, IPN, A.P. 14-740, 07000 México D.F., Mexico; Moreno, C., Departamento de Física y Matemáticas, Centro Universitario de Ciencias Exáctas e Ingenierías, Universidad de Guadalajara, Corregidora 500 S.R., 44420 Guadalajara, Jalisco, Mexico",,"Quiros, I.

García-Salcedo, R.

Matos, T.

Moreno, C.",,"2009",,"We apply the dynamical systems tools to study the linear dynamics of a self-interacting scalar field trapped on a DGP brane. The simplest kinds of self-interaction potentials are investigated: (a) constant potential, and (b) exponential potential. It is shown that the dynamics of DGP models can be very rich and complex. One of the most interesting results of this study shows that dynamical screening of the scalar field self-interaction potential, occurring within the Minkowski cosmological phase of the DGP model and that mimics 4D phantom behaviour, is an attractor solution for a constant self-interaction potential but not for the exponential one. In the latter case gravitational screening is not even a critical point of the corresponding autonomous system of ordinary differential equations. " 2008 Elsevier B.V. All rights reserved.