ar X iv : h ep - t h / 01 03 10 1 v 1 1 3 M ar 2 00 1 1 Strings in a space with tensor central charge coordinates

ar X iv : h ep - t h / 01 03 09 3 v 1 1 3 M ar 2 00 1 Physical Aspects of the Space - Time Torsion

ar X iv : h ep - t h / 01 12 20 6 v 1 2 1 D ec 2 00 1 Hamiltonian of Tensionless Strings with Tensor Central Charge Coordinates

A new class of twistor-like string models in four-dimensional space-time extended by the addition of six tensorial central charge (TCC) coordinates z mn is studied. The Hamiltonian of tensionless string in the extended space-time is derived and its symmetries are investigated. We establish that the string constraints reduce the number of independent TCC coordinates z mn to one real effective co...

ar X iv : h ep - t h / 03 03 11 2 v 1 1 2 M ar 2 00 3 Wakes in Dilatonic Current - Carrying Cosmic Strings

In this work, we present the gravitational field generated by a cosmic string carrying a timelike current in the scalar-tensor gravities. The mechanism of formation and evolution of wakes is fully investigated in this framework. We show explicitly that the inclusion of electromagnetic properties for the string induces logarithmic divergences in the accretion problem.

ar X iv : h ep - t h / 06 03 12 5 v 1 1 5 M ar 2 00 6 hep - th / 0603125 ITP – UH – 05 / 06 Noncommutative Instantons on C

We construct explicit solutions of the Hermitian Yang-Mills equations on the noncommutative space C θ . In the commutative limit they coincide with the standard instantons on CP written in local coordinates.

ar X iv : h ep - t h / 01 03 23 6 v 2 1 7 M ay 2 00 1 1 Supersymmetric Model with Grassmann - odd Lagrangian

A supersymmetric D = 1, N = 1 model with a Grassmann-odd Lagrangian is proposed which, in contrast to the model with an even Lagrangian, contains not only a kinetic term but also an interaction term for the coordinates entering into one real scalar Grassmann-even (bosonic) superfield.