منابع مشابه
Conformally Coupled Inflation
A massive scalar field in a curved spacetime can propagate along the light cone, a causal pathology, which can, in principle, be eliminated only if the scalar couples conformally to the Ricci curvature of spacetime. This property mandates conformal coupling for the field driving inflation in the early universe. During slow-roll inflation, this coupling can cause super-acceleration and, as a sig...
متن کاملCoupled inflation and brane gases
Tirthabir Biswas,* Robert Brandenberger, Damien A. Easson, and Anupam Mazumdar4,5,x Department of Physics, McGill University, Montréal, Quebec, Canada H3A 2T8 Department of Physics, Brown University, Providence, Rhode Island 02912, USA Department of Physics, Syracuse University, Syracuse, New York 13244, USA NORDITA, Blegdamsvej 17, Copenhagen 2100, Denmark The Niels Bohr Institute, Blegdamsvej...
متن کاملDynamical properties of the conformally coupled flat FRW model
In this paper we study the dynamical behaviour of a simple cosmological model defined by a spatially flat Robertson-Walker geometry, conformally coupled with a massive scalar field. We determine a Lyapunov-like function for the non-linear evolution equations. From this function we prove that all the stationary solutions are unstable. We also show that all initial conditions, different from the ...
متن کاملTraversable wormholes from massless conformally coupled scalar fields
The massless conformally coupled scalar field is characterized by the so-called ‘‘new improved stress-energy tensor’’, which is capable of classically violating the null energy condition. When coupled to Einstein gravity we find a three-parameter class of exact solutions. These exact solutions include the Schwarzschild geometry, assorted naked singularities, and a large class of traversable wor...
متن کاملSelf-Similar Collapse of Conformally Coupled Scalar Fields
A massless scalar field minimally coupled to the gravitational field in a simplified spherical symmetry is discussed. It is shown that, in this case, the solution found by Roberts[1], describing a scalar field collapse, is in fact the most general one. Taking that solution as departure point, a study of the gravitational collapse for the self-similar conformal case is presented. Introduction Gr...
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ژورنال
عنوان ژورنال: Galaxies
سال: 2013
ISSN: 2075-4434
DOI: 10.3390/galaxies1020096