منابع مشابه
Inflationary Brans-Dicke Quantum Universe
The formulation of Brans-Dicke (BD) gravity with matter in the Einstein frame is realized as Einstein gravity with dilaton and dilaton coupled matter. We calculate the one-loop 4d anomaly–induced effective action (EA) due to N dilaton coupled massless fermions on the time dependent conformally flat background with non-trivial dilaton. Using such (complete) effective action, the (fourth-order) q...
متن کاملInflationary Brans-Dicke Quantum Universe II: Particular evolutions and stability analysis
We made an analysis of the equations of motion which are obtained from the one–loop effective action for Brans–Dicke gravity with N dilaton–coupled massless fermions in a time–dependent conformally flat background [1]. Various particular solutions, including the well-known stationary one, of the corresponding set of first-order differential equations are given. Some of these solutions describe ...
متن کاملSupersymmetric Potentials in Inflationary Einstein-Cartan-Brans-Dicke Cosmology
Cosmological inflation is discussed in the realm of Einstein-CartanBrans-Dicke (ECBD) gravity by constructing an effective inflaton potential and computing the number of e-folds.It is shown that spintorsion density contributes to a decrease on the number of e-folds of inflation when the ratio of spin-torsion density to matter density is aprecciable as happens in the Early Universe.Quantum fluct...
متن کاملStationary solutions in Brans-Dicke stochastic inflationary cosmology.
In Brans–Dicke theory the Universe becomes divided after inflation into many exponentially large domains with different values of the effective gravitational constant. Such a process can be described by diffusion equations for the probability of finding a certain value of the inflaton and dilaton fields in a physical volume of the Universe. For a typical chaotic inflation potential, the solutio...
متن کاملRenormalization in quantum Brans-Dicke gravity
In the Brans-Dicke model we treat the scalar field exactly and expand the gravitational field in a power series. A comparison with 2D sigma models and φ perturbation theory in four dimensions suggests that the perturbation series in 4D Brans-Dicke model is renormalizable.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)00751-0