The classical dynamics of the tachyon scalar field of cubic string field theory is considered on a cosmological background. Starting from a nonlocal action with arbitrary tachyon potential, which encodes the bosonic and several supersymmetric cases, we study the equations of motion in the Hamilton–Jacobi formalism and with a generalized Friedmann equation, appliable in braneworld or modified gr...

One considers the quantum dynamics of a charged spin-12 particle in an extended external eletromagnetic field that arises from the reduction of a 5dimensional Abelian gauge theory. The non-relativistic regime of the reduced 4D-dynamics is worked out and one identifies the system as a sector of an N=2-supersymmetric quantum-mechanical dynamics. The full supersymmetric model is studied and one ch...

Supersymmetric Rényi entropies are defined for three-dimensional N = 2 superconformal field theories on a branched covering of a three-sphere by using the localized partition functions. Under a conformal transformation, the branched covering is mapped to S1 × H2, whose gravity dual is the charged topological AdS4 black hole. The black hole can be embedded into four-dimensional N = 2 gauged supe...

One considers the quantum dynamics of a charged spin-12 particle in an extended external eletromagnetic field that arises from the reduction of a 5dimensional Abelian gauge theory. The non-relativistic regime of the reduced 4D-dynamics is worked out and one identifies the system as a sector of an N=2-supersymmetric quantum-mechanical dynamics. The full supersymmetric model is studied and one ch...

We show that the bosonic string theory quantized in the Beltrami parametrization possesses a supersymmetric structure like the vectorsupersymmetry already observed in topological field theories. Supported in part by the ”Fonds zur Förderung der Wissenschaftlichen Forschung”, M008-Lise Meitner Fellowship.

These are short notes of three introductory lectures on recently proposed matrix models of Superstrings and M theory given at 5th Nordic Meeting on Supersymmetric Field and String Theories in Helsinki (March 10–12, 1997).

The recently investigated Hilbert-Krein and other positivity structures of the superspace are considered in the framework of superdistributions. These tools are applied to problems raised by the rigorous supersymmetric quantum field theory.

We consider $1+1$ dimensional Yang-Mills theory with gauge group $G$ coupled to a massive Majorana fermion field in an adjoint representation and number of massless Dirac or fermions transforming arbitrary representations the $G$. It is shown that spectrum sector this becomes supersymmetric at particular mass fermion. This independent detailed structure model depends only on integer $k$ measuri...

In SO(32) heterotic string theory, the space–time at the core ofN coincident NS–fivebranes is an infinite throat, IR×S3. As shown by Witten, the throat signals a singularity in the usual heterotic string conformal field theory and a non–perturbative USp(2N) gauge group appears, due to the N small instantons at the fivebranes’ core. Nevertheless, we look for some trace of the non–perturbative ph...

Long ago, Bergshoeff, Sezgin, Tanni and Townsend have shown that the light-cone gauge-fixed action of a super p-brane belongs to a new kind of supersymmetric gauge theory of p-volume preserving diffeomorphisms (diffs) associated with the p-spatial dimensions of the extended object. These authors conjectured that this new kind of supersymmetric gauge theory must be related to an infinite-dim non...