335 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of CoimbraPT197 papers
- Universidade Federal de Santa CatarinaBR23 papers
- Instituto Superior TécnicoPT20 papers
- Joint Institute for Nuclear ResearchRU17 papers
- Centre National de la Recherche ScientifiqueFR14 papers
- University of LisbonPT12 papers
- Instituto Tecnológico de AeronáuticaBR8 papers
- Universidade Federal de Minas GeraisBR8 papers
- Universidade de São PauloBR7 papers
- Universidade Federal do ABCBR7 papers
- Bogolyubov Institute for Theoretical PhysicsUA6 papers
- Ghent UniversityBE6 papers
16 papers · 1 filter
Asymptotic quasinormal modes of string-theoretical -dimensional black holes
Filipe Moura, João Rodrigues
We compute the quasinormal frequencies of -dimensional spherically symmetric black holes with leading string corrections for tensorial gravitational perturbations in the hi…
Eikonal quasinormal modes and shadow of string-corrected -dimensional black holes
Filipe Moura, João Rodrigues
We compute the quasinormal frequencies of -dimensional spherically symmetric black holes with leading string corrections in the eikonal limit for tensorial gravitational pe…
Measuring a QED cross section via a witness particle
Jonas B. Araujo, B. Hiller, I. G. da Paz +2
We consider a QED scattering (), in which is initially entangled with a third particle () that does not participate directly in the scattering. The effect…
The generalised infrared structure of the gluon propagator
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira +1
Gauge theory correlators are potentially more singular in the infrared than those in non-gauge theories. We determine the implications that these singularities have on the spectrum…
Creating Oscillons and Oscillating Kinks in Two Scalar Field Theories
R. A. C. Correa, A. de Souza Dutra, T. Frederico +3
Oscillons are time-dependent, localized in space, extremely long-lived states in nonlinear scalar-field models, while kinks are topological solitons in one spatial dimension. In th…
Remarks on the Mean-Field Theory Based on the SO(2N+1) Lie Algebra of the Fermion Operators
Seiya Nishiyama, Joao Da Providencia
Toward a unified algebraic theory for mean-field Hamiltonian (MFH) describing paired- and unpaired-mode effects, in this paper, we propose a generalized HB (GHB) MFH in terms of th…
Mean-field theory based on the \mathfrak{Jacobi~hsp} := semi-direct sum \mathfrak{h}_N \rtimes \mathfrak{sp}(2N,\mathbb{R})_\mathbb{C} algebra of boson operators
Seiya Nishiyama, Joao Da Providencia
In this paper, we give an expression for canonical transformation group with Grassmann variables, basing on the \mathfrak{Jacobi~hsp} \!:= semi-direct sum \mathfrak{h}_{N} \rtimes…
Supercurrent anomaly and gauge invariance in N=1 supersymmetric Yang-Mills theory
Y. R. Batista, Brigitte Hiller, Adriano Cherchiglia +1
We analyse Feynman diagram calculational issues related to the quantum breaking of supercurrent conservation in a supersymmetric non-abelian Yang-Mills theory. For the sake of simp…
Thermodynamics of general flat space and boson star quasi-local systems
Yan Peng, Jianjun Fang, Shuangxi Yi +1
We study thermodynamics of flat space/boson star systems enclosed in a scalar reflecting box with Stckelberg mechanism. We also disclose effects of model parameters on tr…
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…
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…
Modified Non-Euclidian Transformation on the SO(2N+2)/U(N+1) Grassmannian and SO(2N+1) Random Phase Approximation for Unified Description of Bose and Fermi Type Collective Excitations
Seiya Nishiyama, Joao da Providencia
In a slight different way from the previous one, we propose a modified non-Euclidian transformation on the SO(2N+2)/U(N+1) Grassmannian which give the projected SO(2N+1) Tamm-Danco…
Subtleties in the beta function calculation of N=1 supersymmetric gauge theories
A. L. Cherchiglia, Marcos Sampaio, B. Hiller +1
We investigate some peculiarities in the calculation of the two-loop beta-function of supersymmetric models which are intimately related to the so-called "Anomaly Puzzle". Th…
Path Integral Bosonization of the 't Hooft Determinant: Quasiclassical Corrections
Alexander A. Osipov, Brigitte Hiller
The many-fermion Lagrangian which includes the 't Hooft six-quark flavor mixing interaction (N_f=3) and the U_L(3)\times U_R(3) chiral symmetric four-quark Nambu -- Jona-Lasinio (N…
Large Mass Invariant Asymptotics of the Effective Action
Alexander A. Osipov, Brigitte Hiller
We study the large mass asymptotics of the Dirac operator with a nondegenerate mass matrix m={diag}(m_1,m_2,m_3) in the presence of scalar and pseudoscalar background fields taking…
Inverse Mass Expansion of the One-Loop Effective Action
Alexander A. Osipov, Brigitte Hiller
A method is described for the development of the one-loop effective action expansion as an asymptotic series in inverse powers of the fermion mass. The method is based on the Schwi…