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13 papers · 1 filter
Quantum Renormalization Group for 1 Dimensional Fermion Systems
A. Langari, V. Karimipour
Inspired by the superblock method of White, we introduce a simple modification of the standard Renormalization Group (RG) technique for the study of quantum lattice systems. Our me…
A Modified Quantum Renormalization Group for xxz Spin Chain
A. Langari, V. Karimipour
A simple modification of the standard Renormalization Group (RG) technique for the study of quantum spin systems is introduced. Our method which takes into account the effect of bo…
On the Picard-Fuchs equations of the SW models
M. Alishahiha
We obtain the closed form of the Picard-Fuchs equations for supersymmetric Yang-Mills theories with classical Lie gauge groups. For a gauge group of rank , there are …
Point-Like Structure in Strings and Non-Commutative Geometry
Farhad Ardalan, Amir H. Fatollahi
Dynamics of a free point particle on a multi world-line is presented and shown to reduce to that of a bosonic string theory at the appropriate limit. Other higher dimensional exten…
Different D-brane Interactions
H. Arfaei, M. M. Sheikh Jabbari
We use rotation of one D-brane with respect to the other to reveal the hidden structure of D-branes in type-II theories. This is done by calculation of the interaction amplitude fo…
A Logarithmic Conformal Field Theory Solution For Two Dimensional Magnetohydrodynamics In Presence of The Alf'ven Effect
M. R. Rahimi Tabar, S. Rouhani
When Alf`ven effect is peresent in magnetohydrodynamics one is naturally lead to consider conformal field theories, which have logarithmic terms in their correlation functions. We…