30 citations · 188 across the 18 of their papers we have counts for
18 papers
Soft Scale Symmetry Breaking with Laguerre Explicit Regulators
A. R. Vieira
In this work, we search for explicit regulators that do not spuriously break scale invariance starting from conditions established by implicit regularization. There is a family of…
The full Lorentz-violating vacuum polarization tensor: low and high energy limits
J. C. C. Felipe, A. Yu. Petrov, A. P. Baêta Scarpelli +1
We compute the full vacuum polarization tensor in the fermion sector of Lorentz-violating QED. Even if we assume momentum routing invariance of the Feynman diagrams, it is not poss…
The unambiguous Lorentz-violating induced terms
A. R. Vieira
In this work, we show that surface terms, which map dependence on regularization, can be fixed requiring momentum routing invariance of tadpoles or diagrams with more external legs…
Advances towards the systematization of calculations with Implicit Regularization
B. Z. Felippe, A. P. Baêta Scarpelli, A. R. Vieira +1
There is currently a high demand for theoretical predictions for processes at next-to-next-to-leading order (NNLO) and beyond, mainly due to the large amount of data which has alre…
On plane wave solutions in Lorentz-violating extensions of gravity
J. R. Nascimento, A. Yu. Petrov, A. R. Vieira
In this paper, we obtain dispersion relations corresponding to plane wave solutions in various Lorentz-breaking extensions of gravity with dimensions 3, 4, 5 and 6. We demonstrate…
Two-loop renormalisation of gauge theories in Implicit Regularisation and connections to dimensional methods
A. Cherchiglia, D. C. Arias-Perdomo, A. R. Vieira +2
We compute the two-loop -function of scalar and spinorial quantum electrodynamics as well as pure Yang-Mills and quantum chromodynamics using the background field method in a fu…
Lorentz-Violating Running of Coupling Constants
A. R. Vieira, N. Sherrill
We compute the full vacuum polarization tensor in the minimal QED extension. We find that its low-energy limit is dominated by the radiatively induced Chern-Simons-like term and th…
Lorentz and CPT Violation in Partons
Alan Kostelecky, Enrico Lunghi, Nathan Sherrill +1
A framework is presented for the factorization of high-energy hadronic processes in the presence of Lorentz and CPT violation. The comprehensive effective field theory describing L…
On the Bose symmetry and the left- and right-chiral anomalies
J. S. Porto, A. R. Vieira, A. L. Cherchiglia +2
It is generally assumed that in order to preserve Bose symmetry in the left- (or right-chiral) current it is necessary to equally distribute the chiral anomaly between the vectoria…
Lorentz-Violating QCD Corrections to Deep Inelastic Scattering
A. R. Vieira
In this work, we present CPT- and Lorentz-violating corrections to observable quantities in electron-proton scattering. We also show how the theoretical prediction can be used toge…
Lorentz violation and deep inelastic scattering
Alan Kostelecky, E. Lunghi, A. R. Vieira
The effects of quark-sector Lorentz violation on deep inelastic electron-proton scattering are studied. We show that existing data can be used to establish first constraints on num…
algebra ambiguities in Feynman amplitudes: momentum routing invariance and anomalies in and
A. C. D. Viglioni, A. L. Cherchiglia, A. R. Vieira +2
We address the subject of chiral anomalies in two and four dimensional theories. Ambiguities associated with the algebra within divergent integrals are identified, even thoug…
Momentum Routing Invariance in Extended QED: Assuring Gauge Invariance Beyond Tree Level
A. R. Vieira, A. L. Cherchiglia, Marcos Sampaio
We address the study of gauge invariance in the Standard Model Extension which encompasses all Lorentz-violating terms originated by spontaneous symmetry breaking at the Planck sca…
One-loop conformal anomaly in an implicit momentum space regularization framework
A. R. Vieira, J. C. C. Felipe, G. Gazzola +1
In this paper we consider matter fields in a gravitational background in order to compute the breaking of the conformal current at one-loop order. Standard perturbative calculation…
Guises and Disguises of Quadratic Divergences
A. L. Cherchiglia, A. R. Vieira, Brigitte Hiller +2
In this contribution, we present a new perspective on the control of quadratic divergences in quantum field theory, in general, and in the Higgs naturalness problem, in particular.…
Arbitrariness in the gravitational Chern-Simons-like term induced radiatively
J. C. C. Felipe, A. R. Vieira, A. L. Cherchiglia +2
Lorentz violation through a radiatively induced Chern-Simons-like term in a fermionic theory embedded in linearized quantum gravity with a Lorentz- and CPT-violating axial-vector t…
Naturalness and theoretical constraints on the Higgs boson mass
A. R. Vieira, Brigitte Hiller, M. C. Nemes +1
Arbitrary regularization dependent parameters in Quantum Field Theory are usually fixed on symmetry or phenomenology grounds. We verify that the quadratically divergent behavior re…
Geometry in the entanglement dynamics of the double Jaynes-Cummings model
A. R. Vieira, J. G. G. de Oliveira Junior, J. G. Peixoto de Faria +1
We report on the geometric character of the entanglement dynamics of to pairs of qubits evolving according to the double Jaynes-Cummings model. We show that the entanglement dynami…