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199 papers · 1 filter
Canonical form of Euler-Lagrange equations and gauge symmetries
B. Geyer, D. M. Gitman, I. V. Tyutin
The structure of the Euler-Lagrange equations for a general Lagrangian theory is studied. For these equations we present a reduction procedure to the so-called canonical form. In t…
From Dynamical to Numerical R-Matrices: A Case Study for the Calogero Models
Michael Forger, Axel Winterhalder
Within the class of integrable Calogero models associated with (semi-)simple Lie algebras and with symmetric pairs of Lie algebras identified in a previous paper, we analyze whethe…
The Wave Functions for the Free-Fermion Part of the Spectrum of the Quantum Spin Models
F. C. Alcaraz, Yu. G. Stroganov
We conjecture that the free-fermion part of the eigenspectrum observed recently for the Perk-Schultz spin chain Hamiltonian in a finite lattice with …
Optical polarization and near IR photometry of the proto-planetary nebula Hen 3-1475
Claudia V. Rodrigues, Francisco J. Jablonski, Jane Gregorio-Hetem +2
We present BVRI CCD aperture polarization and near-infrared photometry of the proto-planetary nebula Hen 3-1475. Its intrinsic polarization is high and shows a strong spectral depe…
Short-Time Dynamics of an Ising Model with Competing Interactions
N. Alves, J. R. Drugowich de Felicio
In this work the two-dimensional Ising model with nearest- and next-nearest-neighbor interactions is revisited. We obtain the dynamic critical exponents and from short-time…
On the energy-momentum tensor in non-commutative gauge theories
Ashok Das, J. Frenkel
We study the properties of the energy-momentum tensor in non-commutative gauge theories by coupling them to a weak external gravitational field. In particular, we show that the str…