92 citations · 1.3k across the 98 of their papers we have counts for
29 papers · 1 filter
(Un)determined finite regularization dependent quantum corrections: the Higgs decay into two photons and the two photon scattering examples
A. L. Cherchiglia, L. A. Cabral, M. C. Nemes +1
We investigate the appearance of arbitrary, regularization dependent parameters introduced by divergent integrals in two a priori finite but superficially divergent amplitudes: the…
Ambiguities in the gravitational correction of quantum electrodynamics
J. C. C. Felipe, L. A. Cabral, L. C. T. Brito +2
We verify that quadratic divergences stemming from gravitational corrections to QED which have been conjectured to lead to asymptotic freedom near Planck scale are arbitrary (regul…
Momentum routing invariance in Feynman diagrams and quantum symmetry breakings
L. C. Ferreira, A. L. Cherchiglia, Brigitte Hiller +2
We illustrate with examples that quantum symmetry breakings in perturbation theory are connected to breakdown of momentum routing invariance (MRI) in the loops of a Feynman diagram…
Quantum gravitational contributions to the beta function of quantum electrodynamics
J. C. C. Felipe, L. C. T. Brito, Marcos Sampaio +1
We show in a diagrammatic and regularization independent analysis that the quadratic contribu- tion to the beta function which has been conjectured to render quantum electrodynamic…
QED with minimal and nonminimal couplings: on the quantum generation of Lorentz violating terms in the pure photon sector
G. Gazzola, H. G. Fargnoli, A. P. Baêta Scarpelli +2
We consider an effective model formed by usual QED (minimal coupling) with the addition of a nonminimal Lorentz violating interaction (proportional to a fixed 4-vector ) which…
Regularization Independent Analysis of the Origin of Two Loop Contributions to N=1 Super Yang-Mills Beta Function
H. G. Fargnoli, B. Hiller, A. P. Baêta Scarpelli +2
We present a both ultraviolet and infrared regularization independent analysis in a symmetry preserving framework for the N=1 Super Yang-Mills beta function to two loop order. We s…
Systematic Implementation of Implicit Regularization for Multi-Loop Feynman Diagrams
A. L. Cherchiglia, Marcos Sampaio, M. C. Nemes
Implicit Regularization (IReg) is a candidate to become an invariant framework in momentum space to perform Feynman diagram calculations to arbitrary loop order. In this work we pr…
Ultraviolet and Infrared Divergences in Implicit Regularization: a Consistent Approach
H. G. Fargnoli, A. P. Baeta Scarpelli, L. C. T. Brito +4
Implicit Regularization is a 4-dimensional regularization initially conceived to treat ultraviolet divergences. It has been successfully tested in several instances in the literatu…
Systematization of Basic Divergent Integrals in Perturbation Theory and Renormalization Group Functions
L. C. T. Brito, H. G. Fargnoli, A. P. Baêta Scarpelli +2
We show that to n loop order the divergent content of a Feynman amplitude is spanned by a set of basic (logarithmically divergent) integrals which need not be evaluated. Only the c…
Gauge invariance and the CPT and Lorentz violating induced Chern-Simons-like term in extended QED
A. P. Baeta Scarpelli, Marcos Sampaio, M. C. Nemes +1
The radiative induction of the CPT and Lorentz violating Chern-Simons (CS) term is reassessed. The massless and massive models are studied. Special attention is given to the preser…
Implicit regularization beyond one loop order: gauge field theories
E. W. Dias, A. P. Baeta Scarpelli, L. C. T. Brito +2
We extend a constrained version of Implicit Regularization (CIR) beyond one loop order for gauge field theories. In this framework, the ultraviolet content of the model is displaye…
On the equivalence between Implicit Regularization and Constrained Differential Renormalization
Carlos R. Pontes, A. P. Baêta Scarpelli, Marcos Sampaio +2
Constrained Differential Renormalization (CDR) and the constrained version of Implicit Regularization (IR) are two regularization independent techniques that do not rely on dimensi…
Implicit regularization beyond one loop order: scalar field theories
C. R. Pontes, A. P. Baeta Scarpelli, Marcos Sampaio +1
Implicit regularization (IR) has been shown as an useful momentum space tool for perturbative calculations in dimension specific theories, such as chiral gauge, topological and sup…
Arbitrary parameters in implicit regularization and democracy within perturbative description of 2-dimensional gravitational anomalies
Leonardo A. M. Souza, Marcos Sampaio, M. C. Nemes
We show that the Implicit Regularization Technique is useful to display quantum symmetry breaking in a complete regularization independent fashion. Arbitrary parameters are express…
Implicit Regularization and Renormalization of QCD
M. D. Sampaio, A. P. B. Scarpelli, J. E. Ottoni +1
We apply the Implicit Regularization Technique (IR) in a non-abelian gauge theory. We show that IR preserves gauge symmetry as encoded in relations between the renormalizations con…
Spacetime quantization induced by axial currents
S. Carneiro, M. C. Nemes
In the present contribution we show that the introduction of a conserved axial current in electrodynamics can explain the quantization of electric charge, inducing at the same time…
Mass Scales and Their Relations in Symmetric Quantum Field Theory
S. R. Gobira, M. C. Nemes
We illustrate the importance of mass scales and their relation in the specific case of the linear sigma model within the context of its one loop Ward identities. In the calculation…
Renormalization Conditions and the Sliding Scale in the Implicit Regularization Scheme: A Simple Connection
A. Brizola, S. R. Gobira, Marcos Sampaio +1
We describe in detail how a sliding scale is introduced in the renormalization of a QFT according to integer-dimensional implicit regularization scheme. We show that since no regul…
Comparing Implicit, Differential, Dimensional and BPHZ Renormalisation
M. Sampaio, A. P. Baeta Scarpelli, B. Hiller +3
We compare a momentum space implicit regularisation (IR) framework with other renormalisation methods which may be applied to dimension specific theories, namely Differential Renor…
On the Renormalization of a Bosonized Version of the Chiral Fermion-Meson Model at Finite Temperature
H. C. de Godoy Caldas, M. C. Nemes
Feynman's functional formulation of statistical mechanics is used to study the renormalizability of the well known Linear Chiral Sigma Model in the presence of fermionic fields at…
Chiral Anomaly and CPT invariance in an implicit momentum space regularization framework
A. P. Baeta Scarpelli, M. Sampaio, M. C. Nemes +1
This is the second in a series of two contributions in which we set out to establish a novel momentum space framework to treat field theoretical infinities in perturbative calculat…
N-loop Treatment of Overlapping Diagrams by the Implicit Regularization Technique
S. R. Gobira, M. C. Nemes
We show how the Implicit Regularization Technique (IRT) can be used for the perturbative renormalization of a simple field theoretical model, generally used as a test theory for ne…
Consistency Relations for an Implicit n-dimensional Regularization Scheme
A. P. B. Scarpelli, M. Sampaio, M. C. Nemes
We extend an implicit regularization scheme to be applicable in the -dimensional space-time. Within this scheme divergences involving parity violating objects can be consistentl…
Consistency in Regularizations of the Gauged NJL Model at One Loop Level
O. A. Battistel, M. C. Nemes
In this work we revisit questions recently raised in the literature associated to relevant but divergent amplitudes in the gauged NJL model. The questions raised involve ambiguitie…