Spatially homogeneous Bianchi type-II, VIII and IX anisotropic, as well as isotropic cosmological models can be obtained in a scalar tensor theory of gravitation proposed by Saez and Ballester (1986) when the source for energy momentum tensor is a bulk viscous fluid containing one-dimensional cosmic strings. All the models obtained and presented here are expanding, non-rotating and accelerating...

We study the gravitational radiation emission efficiency $\Gamma$ of superconducting cosmic strings. demonstrate, by using a solvable model transonic strings, that presence current leads to suppression cusps, kinks and different types loops. also show that, when is present, spectrum loops with cusps exponentially suppressed as harmonic mode increases, thus being significantly from power law cur...

In this article we examine the appearance of tensionless strings in M-Theory. We subsequently interpret these tensionless strings in a String Theory context. In particular, we examine tensionless strings appearing in M-Theory on S, M-Theory on S/Z2, and MTheory on T ; we then interpret the appearance of such strings in a String Theory context. Then we reverse this process and examine the appear...

We study the intercommuting of semilocal strings and Skyrmions for a wide range of internal parameters, velocities, and intersection angles by numerically evolving the equations of motion. We find that the collisions of strings and strings, strings and Skyrmions, and Skyrmions and Skyrmions all lead to intercommuting for a wide range of parameters. Even the collisions of unstable Skyrmions and ...

We study T-duality for open strings on tori Td. The general boundary conditions for the open strings are constructed, and it is shown that T-duality group, which preserves the mass spectrum of closed strings, preserves also the mass spectrum of the open strings. The open strings are transformed to those with different boundary conditions by T-duality. We also discuss the T-duality for D-brane m...

We argue that apart from the standard closed and open strings one may consider a third possibility that we call monodromic strings. The monodromic string propagating on a target looks like an ordinary open string (a mapping from a segment to the target) but its space of states is isomorphic to that of a closed string. It is shown that the monodromic strings naturally appear in T-dualizing close...

We introduce nonlinear scalar field models for open and openclosed strings with spacetime derivatives encoded in the operator valued Riemann zeta function. The corresponding two Lagrangians are derived in an adelic approach starting from the exact Lagrangians for effective fields of p-adic tachyon strings. As a result tachyons are absent in these models. These new strings we propose to call zet...

The MetaMap program’s purpose is to discover the Metathesaurus concepts referred to in arbitrary text. A given Metathesaurus concept can have many alternative names (Metathesaurus strings) which originate in the many source vocabularies included in the Metathesaurus. As the number of strings has grown over the years, MetaMap’s performance has suffered. In the 2010AA version of the Metathesaurus...