42 citations · 435 across the 43 of their papers we have counts for
43 papers
On Restricting First Order Form of Gauge Theories to One-Loop Order
F. T. Brandt, J. Frenkel, S. Martins-Filho +1
The first order form of the Yang-Mills and Einstein-Hilbert actions are quantized, and it is shown how Green's functions computed using the first and the second order form of these…
First order formulation of the Yang-Mills theory in a background field
F. T. Brandt, J. Frenkel, D. G. C. McKeon
The background gauge renormalization of the first order formulation of the Yang-Mills theory is studied by using the BRST identities. Together with the background symmetry, these i…
Renormalisation of a diagonal formulation of first order Yang-Mills theory
F T Brandt, J Frenkel, D G C McKeon
We study the BRST renormalization of an alternative formulation of the Yang-Mills theory, where the matrix-propagator of the gluon and the complementary fields is diagonal. This pr…
Effective Action for Hard Thermal Loops in Gravitational Fields
R. R. Francisco, J. Frenkel, J. C. Taylor
We examine, through a Boltzmann equation approach, the generating action of hard thermal loops in the background of gravitational fields. Using the gauge and Weyl invariance of the…
Large time behavior in an exactly soluble out of equilibrium model
Ashok K. Das, J. Frenkel
We study the behavior of out of equilibrium retarded, advanced and correlated Green's functions within the context of an exactly soluble (quenched) model. We show, to the lowest or…
QED plasma in a background of static gravitational fields
F. T. Brandt, J. Frenkel, J. B. Siqueira
We obtain the effective Lagrangian of static gravitational fields interacting with a QED plasma at high temperature. Using the equivalence between the static hard thermal loops and…
Hard thermal loops in static background fields
F. T. Brandt, J. Frenkel, J. B. Siqueira
We discuss the high temperature behavior of retarded thermal loops in static external fields. We employ an analytic continuation of the imaginary time formalism and use a spectral…
On the gauge independence of the fermion pole mass
Ashok K. Das, R. R. Francisco, J. Frenkel
We study the question of complete gauge independence of the fermion pole mass by choosing a general class of gauge fixing which interpolates between the covariant, the axial and th…
The pole of the fermion propagator in a general class of gauges
Ashok K. Das, J. Frenkel
We study the behavior of the pole of the fermion propagator, in QED in -dimensions, in a general class of gauges which interpolate between the covariant, the axial and the Coulo…
Hard thermal loops in long wave-length and static external gravitational fields
R. R. Francisco, J. Frenkel
We study, in the long wave-length and static limits, the structure of the n-point graviton functions at high temperature. Using the gauge and Weyl invariance of the theory, we deri…
Nonanalyticity of the free energy in thermal field theory
F. T. Brandt, J. Frenkel, J. B. Siqueira
We study, in a d-dimensional space-time, the nonanalyticity of the thermal free energy in the scalar phi^4 theory as well as in QED. We find that the infrared divergent contributio…
Causal amplitudes in the Schwinger model at finite temperature
Ashok Das, R. R. Francisco, J. Frenkel
We show, in the imaginary time formalism, that the temperature dependent parts of all the retarded (advanced) amplitudes vanish in the Schwinger model. We trace this behavior to th…
Conditions for the validity of the quantum Langevin equation
J. Frenkel, J. C. Taylor
From microscopic models, a Langevin equation can in general be derived only as an approximation. Two possible conditions to validate this approximation are studied. One is, for a l…
Thermal effective action for 1+1 dimensional massive QED
Ashok Das, J. Frenkel
In continuation of our earlier proposal for evaluating thermal effective actions, we determine the exact fermion propagator in 1+1 dimensional massive QED. This propagator is used…
Effective actions at finite temperature
Ashok Das, J. Frenkel
This is a more detailed version of our recent paper where we proposed, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a gener…
Hard thermal loops in static external fields
J. Frenkel, S. H. Pereira, N. Takahashi
We study, in the imaginary-time formalism, the high temperature behavior of n-point thermal loops in static Yang-Mills and gravitational fields. We show that in this regime, any ha…
The long wavelength limit of hard thermal loop effective actions
F T Brandt, J Frenkel, J C Taylor
We derive a closed form expression for the long wavelength limit of the effective action for hard thermal loops in an external gravitational field. It is a function of the metric,…
Classical transport equation in non-commutative QED at high temperature
F. T. Brandt, Ashok Das, J. Frenkel
We show that the high temperature behavior of non-commutative QED may be simply obtained from Boltzmann transport equations for classical particles. The transport equation for the…
Transport equation and hard thermal loops in noncommutative Yang-Mills theory
F. T. Brandt, Ashok Das, J. Frenkel +2
We show that the high temperature limit of the noncommutative thermal Yang-Mills theory can be directly obtained from the Boltzmann transport equation of classical particles. As an…
Hard Thermal Effects in Noncommutative U(N) Yang-Mills Theory
F. T. Brandt, J. Frenkel, D. G. C. McKeon
We study the behaviour of the two- and three-point thermal Green functions, to one loop order in noncommutative U(N) Yang-Mills theory, at temperatures much higher than the ext…
Kronecker delta energy terms in thermal field theory
F. T. Brandt, Ashok Das, J. Frenkel +1
We discuss, using the imaginary time method, some aspects of the connection between the Ward identity, the non-analyticity of amplitudes and the causality relation in QED at finite…
Induced parity violating thermal effective action for (2+1)-dimensional fermions interacting with a non-Abelian background
F. T. Brandt, Ashok Das, J. Frenkel
We study the parity breaking effective action in 2+1 dimensions, generated, at finite temperature, by massive fermions interacting with a non-Abelian gauge background. We explicitl…
Absence of higher order corrections to the non-Abelian topological mass term
F. T. Brandt, Ashok Das, J. Frenkel
We study the Yang-Mills-Chern-Simons theory systematically in an effort to generalize the Coleman-Hill result to the non-Abelian case. We show that, while the Chern-Simons coeffici…
Absence of higher order corrections to the non-Abelian Chern-Simons coefficient
F. T. Brandt, Ashok Das, J. Frenkel
We extend the Coleman-Hill analysis to non-Abelian Chern-Simons theories containing a tree level topological mass term. We show, in the case of a pure Yang-Mills-Chern-Simons theor…