46 citations · 564 across the 87 of their papers we have counts for
71 papers · 1 filter
Unified worldline treatment of Yukawa and axial couplings
F. Bastianelli, O. Corradini, J. P. Edwards +2
We provide a worldline representation of the one-loop effective action for a Dirac particle coupled to external scalar, pseudoscalar, vector and axialvector fields. Extending previ…
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…
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…
A Gauge Theory that mixes Bosonic and Fermionic Gauge Fields
D. G. C. McKeon
Using a gauge symmetry derived by applying the Dirac constraint formalism to supergravity with cosmological term in 2+1 dimensions, we construct a gauge theory with many characteri…
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…
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…
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…
A Systematic Expansion of Running Couplings and Masses
F. A. Chishtie, D. G. C. McKeon, T. N. Sherry
As an alternative to directly integrating their defining equations to find the running coupling and the running mass , we expand these quantities in powers of $\ln\lef…
The Renormalization Group and the Effective Potential in the Wess-Zumino model
D. G. C. McKeon
We consider the effective potential V in the massless Wess-Zumino model. By using the renormalization group equation, we show that the explicit dependence of V on the renormalizati…
The Non-Abelian Gauge Field Propagator in a Plane Wave Background Field
D. G. C. McKeon
Employing methods introduced by Schwinger in quantum electrodynamics, we compute the propagator for a non-Abelian gauge field in a plane wave background field. In the long distance…
The Effectve Potential in Massless Theories
D. G. C. McKeon
The effective potential V in a massless self-coupled scalar theory and massless scalar electrodynamics is considered. Both the MS and Coleman-Weinberg renormalization schemes are e…
Quantizing the Palatini action using a transverse traceless propagator
F. T. Brandt, D. G. C. McKeon, Chenguang Zhao
We consider the first order form of the Einstein-Hilbert action and quantize it using the path integral. Two gauge fixing conditions are imposed so that the graviton propagator is…
Symplectic Analysis of the Two Dimensional Palatini Action
D. G. C. McKeon
The symplectic analysis, initiated by Faddeev and Jackiw, is applied to the first order (Palatini) form of the Einstein-Hilbert action in 1 + 1 dimensions. The constraints that ari…
Radiative Corrections and the Palatini Action
F. T. Brandt, D. G. C. McKeon
By using the Faddeev-Popov quantization procedure, we demonstrate that the radiative effects computed using the first-order and second-order Einstein-Hilbert action for General Rel…
Perturbative Calculations with the First Order Form of Gauge Theories
F. T. Brandt, D. G. C. McKeon
The first and second order form of gauge theories are classically equivalent; we consider the consequence of quantizing the first order form using the Faddeev-Popov approach. Both…
Ghosts from Ghosts in the BRST Formalism
D. G. C. McKeon
We show that the Hamiltonian HQ introduced in the course of BRST analysis of a gauge theory may in fact be associated with an action that itself is gauge invariant. This action can…
The Superparticle on the Surface S_2
D. G. C. McKeon
A superparticle action which is globally supersymmetric in the target space is proposed. The supersymmetry is the supersymmetric extension of the rotation group O(3).
A Canonical Analysis of the Massless Superparticle
D. G. C. McKeon
The canonical structure of the action for a massless superparticle is considered in d = 2 + 1 and d = 3 + 1 dimensions. This is done by examining the contribution to the action of…