Generalized Gaussian Effective Potential: Low Dimensional Scalar Fields

We study a generalization of the Gaussian effective potential for self-interacting scalar fields in one and two spatial dimensions. We compute the two-loop corrections and discuss the renormalization of the generalized Gaussian effective potential.Comment: tex, 10 pages + 4 Postscript figures include

Electrodynamics in an LTB scenario

In this article we analyze the electrodynamics in curved space-time in LTB metric. We calculate the most general scale factor in this inhomogeneous Universe. We also study the presence of electromagnetic field bubbles in the Universe.Comment: 9 pages, Accepted for publication in the EPJ

Cosmic acceleration and f(R)f(R) theory: perturbed solution in a matter FLRW model

In the present paper we consider $f(R)$ gravity theories in the metric approach and we derive the equations of motion, focusing also on the boundary conditions. In such a way we apply the general equations to a first order perturbation expansion of the Lagrangian. We present a model able to fit supernovae data without introducing dark energy.Comment: 10 pages, 1 figur

On the Primordial Magnetic Field from Domain Walls

In this paper we discuss once more the zero mode contribution to the vacuum energy density. We show that a careful treatment of the zero modes leads to the conclusion that domain walls may be ferromagnetic, and could generate a magnetic field of cosmological interest

Editor's Note

Editor's Not