منابع مشابه
Friedmann-robertson-walker Cosmologies
Abstract. Electrodynamics for self-interacting scalar fields in spatially flat FriedmannRobertson-Walker space-times is studied. The corresponding one-loop field equation for the expectation value of the complex scalar field in the conformal vacuum is derived. For exponentially expanding universes, the equations for the Bogoliubov coefficients describing the coupling of the scalar field to grav...
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Green functions ~retarded, advanced, Feynman and Dyson propagators! are calculated for the electromagnetic field in Robertson–Walker cosmologies with hyperbolic 3-manifolds as spacelike slices. The starting point is the Proca equation, i.e., the Maxwell field with a finite photon mass for infrared regularization, in a static cosmology with simply connected hyperbolic 3-sections. The time and sp...
متن کاملScalar Field Cosmologies with Perfect Fluid in Robertson-walker Metric
Several isotropic, homogeneous cosmological models containing a self-interacting minimally coupled scalar eld, a perfect uid source and cosmological constant are solved. New exact, asymptotically stable solutions with an in ationary regime or a nal Friedmann stage are found for some simple, interesting potentials. It is shown that the uid and the curvature may determine how these models evolve ...
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We investigate the Wightman function, the vacuum expectation values of the field squared and the energy-momentum tensor for a massless scalar field with general curvature coupling parameter in spatially flat Friedmann-Robertson-Walker universes with an arbitrary number of toroidally compactified dimensions. The topological parts in the expectation values are explicitly extracted and in this way...
متن کاملPhase-plane analysis of Friedmann-Robertson-Walker cosmologies in Brans–Dicke gravity
We present an autonomous phase-plane describing the evolution of FriedmannRobertson-Walker models containing a perfect fluid (with barotropic index γ) in BransDicke gravity (with Brans-Dicke parameter ω). We find self-similar fixed points corresponding to Nariai’s power-law solutions for spatially flat models and curvature-scaling solutions for curved models. At infinite values of the phase-pla...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/04/016