32 citations · 497 across the 65 of their papers we have counts for
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Thermal quantum gravity in a general background gauge
F. T. Brandt, J. Frenkel, D. G. C. McKeon +1
We calculate in a general background gauge, to one-loop order, the leading logarithmic contribution from the graviton self-energy at finite temperature , extending a previous an…
Loop corrections in a solvable UV-finite model and its effective field theory
F. T. Brandt, J. Frenkel, D. G. C. McKeon +1
We examine some features of the non-renormalizability induced through the use of low-energy effective Lagrangians in loop diagrams, in the context of a scalar model which is ultrav…
Quantum gravity in a general background gauge
F. T. Brandt, J. Frenkel, D. G. C. McKeon
We deduce, in a general background gauge, the counter-term Lagrangian for pure quantum gravity to one-loop order. As an application, we evaluate the leading quantum correction to t…
Feynman diagrams in terms of on-shell propagators
F. T. Brandt, J. Frenkel, D. G. C. McKeon
It is shown that the usual expression for a Feynman diagram in terms of the Feynman propagator can be replaced by an equivalent expression involving the positive-energy…
On the analytically-improved running coupling in QCD
F. T. Brandt, J. Frenkel, D. G. C. McKeon +1
We examine, in the `t Hooft renormalization scheme, the analytic running coupling in QCD, using the two-loop -function with positive expansion parameters an…
Forward scattering amplitudes in the imaginary time formalism
F. T. Brandt, J. Frenkel, S. Martins-Filho +2
We study, in the imaginary time formalism, the relation between loops and on-shell forward scattering tree amplitudes in thermal field theories. This allows for an efficient evalua…
Thermal gauge theories with Lagrange multiplier fields
F. T. Brandt, J. Frenkel, S. Martins-Filho +2
We study the Yang-Mills theory and quantum gravity at finite temperature, in the presence of Lagrange multiplier fields. These restrict the path integrals to field configurations w…
Restricting loop expansions in gauge theories coupled to matter
F. T. Brandt, J. Frenkel, S. Martins-Filho +1
Quantizing any model in which a Lagrange multiplier (LM) field is used to restrict field configurations to those that satisfy the classical equations of motion, leads to at most on…
Structural identities in the first order formulation of quantum gravity
F. T. Brandt, J. Frenkel, S. Martins-Filho +1
We study the self-consistency of the first order formulation of quantum gravity, which may be attained by introducing, apart from the graviton field, another auxiliary quantum fiel…
Consistency Conditions for the First-Order Formulation of Yang-Mills Theory
F T Brandt, J Frenkel, S Martins-Filho +1
We examine the self-consistency of the first-order formulation of the Yang-Mills theory. By comparing the generating functional before and after integrating out the additional…
Use of Lagrange multiplier fields to eliminate multiloop corrections
F. T. Brandt, J. Frenkel, D. G. C. McKeon +1
The problem of eliminating divergences arising in quantum gravity is generally addressed by modifying the classical Einstein-Hilbert action. These modifications might involve the i…
On Restricting to One Loop Order the Radiative Effects in Quantum Gravity
F. T. Brandt, J. Frenkel, D. G. C. McKeon
The dimensionful nature of the coupling in the Einstein-Hilbert action in four dimensions implies that the theory is non-renormalizable; explicit calculation shows that beginning a…
Renormalization of six-dimensional Yang-Mills theory in a background gauge field
F. T. Brandt, J. Frenkel, D. G. C. McKeon
Using the background field method, we study in a general covariant gauge the renormalization of the 6-dimensional Yang-Mills theory. This requires background gauge invariant counte…
Background gauge renormalization and BRST identities
J Frenkel, J C Taylor
We show that the BRST identities can be used to control the renormalization of the background gauge in QCD, in spite of the fact that one-particle reducible graphs have to be omitt…
Fermion propagator in an external potential and generalized Airy functions
A. L. M. Britto, Ashok K. Das, J. Frenkel
We study the behavior of the fermion propagator in an external time dependent potential in 0+1 dimension. We show that, when the potential has upto quadratic terms in time, the pro…
BRST renormalization of the first order Yang-Mill theory
J Frenkel, J C Taylor
We examine the renormalization of the first order formulation of Yang-Mills theory, by using the BRST idenities. These preserve the gauge invariance of the theory and enable a recu…
Dual symmetry in a generalized Maxwell theory
F. T. Brandt, J. Frenkel, D. G. C. McKeon
We examine Podolsky's electrodynamics, which is noninvariant under the usual duality transformation. We deduce a generalization of Hodge's star duality, which leads to a dual gauge…
Generalized Kadanoff-Baym relation in nonequilibrium quenched models
A. L. M. Britto, Ashok K. Das, J. Frenkel
In the context of a broad class of quenched models, we derive a generalized differential form of the Kadanoff-Baym (KB) ansatz which relates the out of equilibrium correlated and s…
Generalized fluctuation-dissipation theorem in a soluble out of equilibrium model
A. L. M. Britto, Ashok K. Das, J. Frenkel
In the context of an exactly soluble out of equilibrium (quenched) model, we study an extension of the fluctuation-dissipation relation. This involves a modified differential form…
Derivation of the fluctuation-dissipation theorem from unitarity
Ashok K. Das, J. Frenkel
Using the closed time path formalism in thermal field theory, we give a derivation of the fluctuation-dissipation theorem which is based on the unitarity of the -matrix.
Infrared divergences, mass shell singularities and gauge dependence of the dynamical fermion mass
Ashok K. Das, J. Frenkel, C. Schubert
We study the behavior of the dynamical fermion mass when infrared divergences and mass shell singularities are present in a gauge theory. In particular, in the massive Schwinger mo…
Hard Thermal Loops in the n-Dimensional phi3 Theory
F. T. Brandt, J. Frenkel
We derive a closed-form result for the leading thermal contributions which appear in the n-dimensional phi3 theory at high temperature. These contributions become local only in the…
The thermal chiral anomaly in the Schwinger model
Ashok Das, J. Frenkel
In the Schwinger model at finite temperature, we derive a closed form result for the chiral anomaly which arises from the long distance behavior of the electric field \cite{frenkel…
Infrared chiral anomaly at finite temperature
Ashok Das, J. Frenkel
We study the Schwinger model at finite temperature and show that a temperature dependent chiral anomaly may arise from the long distance behavior of the electric field. At high tem…