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The classical partition function for a system in thermodynamical equilibrium formed by N identical non-relativistic particles interacting through Coulomb potentials and with the dynamical dectromagnetic field is studied. It is proved that the dy[...]texto impreso
We show that the renormalized vacuum expectation value of he Wilson loop for topologically massive abelian gauge theory in R3 can be defined so that its large-mass limit is the renormalized vacuum expectation value of the Wilson loop for abelia[...]texto impreso
We show that noncommutative gauge theories with arbitrary compact gauge group defined by means of the Seiberg-Witten map have the same one-loop anomalies as their commutative counterparts. This is done in two steps. By explicitly calculating the[...]texto impreso
Lorentzian signature D-branes of all dimensions for the Nappi-Witten string are constructed. This is done by rewriting the gluing condition J(+) = FJ(-) for the model chiral currents on the brane as a well posed first order differential problem [...]texto impreso
We prove that three-dimensional N=1 supersymmetric Yang Mills-Chem-Simons theory is finite to all loop orders, In general this leaves open the possibility that different regularization methods lead to different finite effective actions. We show [...]texto impreso
We study quantum Chern-Simons theory as the large-mass limit of the limit D --> 3 of dimensionally regularized topologically massive Yang-Mills theory. This approach can also be interpreted as a BRS-invariant hybrid regularization of Chern-Simo[...]texto impreso
A model for the diffusion of vector fields driven by external forces is proposed. Using the renormalization group and the epsilon-expansion, the dynamical critical properties of the model with Gaussian noise for dimensions below the critical dim[...]texto impreso
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An exact solution for the Schwinger model at finite temperature is given. Path integral methods and thermo field dynamics are used. The explicit dependence of the complete propagators with temperature is foundtexto impreso
We consider ?-model strings and U(1) global strings coupled to gravity and look for static solutions with whole cylinder symmetry. We prove that in both cases there are no regular spatially compact solutions. The U(1) global string admits no asy[...]texto impreso
It is shown that thermo-field dynamics permits the extension of the path integral methods used to solve the Thirring model at zero temperature to the finite temperature case. A family of exact solutions for the propagator and their dependence wi[...]texto impreso
It is argued that the quadratic and linear non-commutative IR divergences that occur in U(1) theory on non-commutative Minkowski space-time for small non-commutativity matrices theta (mu nu) are gauge-fixing independent. This implies in particul[...]texto impreso
The geometric description of D-branes inWZWmodels is pushed forward. Our starting point is a gluing condition J+ = FJ? that matches the model’s chiral currents at the worldsheet boundary through a linear map F acting on the WZW Lie algebra. The [...]texto impreso
We compute the beta function at one loop for Yang-Mills theory using as regulator the combination of higher covariant derivatives and Pauli-Villars determinants proposed by Faddeev and Slavnov. This regularization prescription has the appealing [...]texto impreso
The renormalization algorithm based on regularization methods with two regulators is analyzed by means of explicit computations. We show in particular that regularization by higher covariant derivative terms can be complemented with dimensional [...]
