We elaborate on integrable dynamical systems from scalar–gravity Lagrangians that include the leading dilaton tadpole potentials of broken supersymmetry. In static Dudas–Mourad compactifications ten to nine dimensions, which rest these potentials, string coupling and space–time curvature become unbounded in some regions internal space. On other hand, remains bounded several corresponding soluti...

We present the theory of weak gravitational lensing in cosmologies with generalized gravity, described in the Lagrangian by a generic function depending on the Ricci scalar and a non-minimally coupled scalar field. We work out the generalized Poisson equations relating the dynamics of the fluctuating components to the two gauge invariant scalar gravitational potentials, fixing the new contribut...

We study the cosmological inflation within context of f(Q, T) gravity, wherein Q is nonmetricity scalar and T trace matter energy-momentum tensor. By choosing a linear combination T, we first analyze realization an inflationary scenario driven via geometrical effects gravity then, obtain modified slow-roll parameters, tensor spectral indices, tensor-to-scalar ratio for proposed model. In additi...

We present inflationary models of the early universe in the braneworld scenario considering both scalar field and tachyon field separately. The technique of Chervon and Zhuravlev to obtain inflationary cosmological models without restrictions on a scalar field potential is employed here. We note that like scalar field, the inflationary solution obtained here with tachyon field also does not dep...

In this paper we present the design of a super-scalar processor constructed using optoelectronic components interconnected via high-speed free-space optical buses.

We investigate general scalar field potentials V (φ) for inflationary cosmology arising from spontaneous symmetry breaking. We find that potentials which are dominated by terms of order φm with m > 2 can satisfy observational constraints at an arbitrary symmetry breaking scale. Of particular interest, the spectral index of density fluctuations is shown to be independent of the specific form of ...

We discuss the Kirchhoff gauge in classical electrodynamics. In this gauge the scalar potential satisfies an elliptical equation and the vector potential satisfies a wave equation with a nonlocal source. We find the solutions of both equations and show that, despite of the unphysical character of the scalar potential, the electric and magnetic fields obtained from the scalar and vector potentia...

Stabilization of inter–brane distance is analyzed in 5–dimensional models with higher–order scalar kinetic terms. Equations of motion and boundary conditions for background and for scalar perturbations are presented. Conditions sufficient and (with one exception) necessary for stability are derived and discussed. It is shown that it is possible to construct stable brane configurations even with...

In this paper we follow the lines of recent works to investigate systems of two coupled real scalar fields defined by potentials that describe periodic interactions between the scalar fields. We work with polymeric chains containing periodic interactions between the coupled fields, and we investigate the topological sectors to obtain explicit soliton solutions and their corresponding energy. In...

Anthropic solutions to the cosmological constant problem require seemingly unnatural scalar field potentials with a very small slope or domain walls (branes) with a very small coupling to a four-form field. Here we introduce a class of models in which the smallness of the corresponding parameters can be attributed to a spontaneously broken discrete symmetry. We also demonstrate the equivalence ...