Conveners
Apresentações de vídeo-pôsteres: Sessão 1
- Rodolfo Alván Casana Sifuentes (Universidade Federal do Maranhão)
- Carlos Alberto Santos de Almeida
Apresentações de vídeo-pôsteres: Sessão 2
- Dionísio Bazeia
- Luciano Abreu
Apresentações de vídeo-pôsteres: Sessão 3
- Manoel M. Ferreira Jr. (UFMA)
- Carlos Alberto Santos de Almeida
In this study we analyze the critical dynamics of a real scalar field in 2D near a continuos phase transition. We have computed
and solved Dynamical Renormalization Group (DRG) equations to two loops order. We have found that, different from
the case $ d < 4 $, characterized by a Wilson-Fisher fixed point with $ z = 2 + O(
\epsilon^2) $, the critical dynamics is
dominated by a novel...
In this video, I will talk about a work I did when I was an undergraduate student in physics at Federal Fluminense University (UFF). This work lead to two papers, that are available online on the links:
First: https://dx.doi.org/10.1007/JHEP03%282021%29104
Second: https://arxiv.org/abs/2107.10129v3
We considered the non-relativistic (NR) and the ultra-relativistic (UR) limits of the...
In this contribution, we reassess a supersymmetric model that takes into account the photon-photino sector in presence of a supersymmetric, but Lorentz-symmetry violating (LSV), background. The photon and photino fields appear mixed due to the presence of a constant background Majorana fermion that, as a by-product of supersymmetry, induces the mixing . Two real four-vectors, which represent...
In this work we consider the Einstein-Hilbert action in the first order order formalism coupled to Dirac spinors. From the little group symmetry, we derive the corresponding Bargmann-Wigner current which is conserved but not gauge invariant. Therefore, we construct a gauge invariant version of the Bargmann-Wigner current which is not conserved but potentially observable. Because it is not...
One crucial step to discuss general aspects of the perturbative expansion in quantum field theories is the definition and use of parametric representations of Feynman amplitudes. However, even though the usual zero temperature scenario is well-known and textbook material, a complete discussion of a parametric representation considering finite temperature and finite-size effects is absent in...
In this work, we give a quantitative answer to the question: how sudden or how adiabatic is a frequency change in a quantum harmonic oscillator (HO)? We do that by studying the time evolution of a HO which is initially in its fundamental state and whose time-dependent frequency is controlled by a parameter (denoted by $\epsilon$) that can continuously tune from a totally slow process to a...
In this work, we investigate the combined effects of temperature, external magnetic field and finite size of the system on the properties of neutral mesons in a dense and hot medium, in the context of the Nambu-Jona-Lasinio (NJL) model. In particular, we use the mean-field approximation, Schwinger's proper time method and the Matsubara series treated through the of Jacobi's theta functions, to...
The recently observed doubly charmed state $T_{cc}^+$ belongs to the family
of the multiquark states called exotic hadrons. One of main goals of
modern hadron physics is to determine the strucutre of these exotic hadrons.
Nucleus-nucleus collisions at the LHC offer a possibility to achieve this goal.
The yield of $T_{cc}^+$'s produced at the end of the quark-gluon plasma
phase of...
The "puzzling" matter of anomalies at linearly diverging tensors at all even dimensions is being explored with a strategy developed at the end of the '90s, sometimes called implicit regularization. The main focus is not the divergences that are at all avoided but is the role played by the appearance of the epsilon tensor in the traces with the chiral matrix in these amplitudes. Different...
In this work we study kinklike structures, which are localized solutions that appear in models described by real scalar fields. The model to be considered is characterized by two real scalar fields and includes a function of one of the two fields that modifies the kinematics associated to the other field. The investigation brings to light a first order framework that minimizes the energy of...
In the 1970s, heavy mesons like the quarkonia $J/\Psi$ and $\Upsilon$ were discovered, yielding a revolution in hadron physics. Since then, the hadron spectroscopy has gained a lot of attention, with the observation of several states in the charmonium and bottomonium sectors of the spectrum, as well as heavy mesons with open flavors. From the theoretical perspective, we have witnessed the...
We investigate the finite-size effects on the constituent quark masses of a two-flavor four-fermion interaction model with a flavor-mixing in the presence of a magnetic background.
The presence of a magnetic field in a specific direction compromises the isotropy, so that particles subject to this field are no longer described by plane waves. Therefore, the propagator assumes a non-diagonal form, which does not allow us to write it as a Fourier transform. In order to find the propagators of charged particles subject to external magnetic field, onde can use Ritus...
We study the existence of BPS vortices in a Chern-Simons-CP(2) model in the presence of magnetic impurities. The minimization of the energy via the Bogomol’nyi-Prasad-Sommerfield (BPS) formalism allows us to obtain the first-order differential equations (or BPS equations) and the corresponding Bogomol’nyi bound. The magnetic impurity chose for our study is a Gaussian-type, then the numerical...
We investigate the existence of first-order vortices inherent to both the Maxwell-Chern-Simons-Higgs model extended via the inclusion of an extra scalar
sector which plays the role of a source field. For this case, we focus our attention on the time-independent configurations with radial symmetry which can be obtained through the implementation
of the so-called Bogomol’nyi-Prasad-Sommerfield...
In this presentation, we describe the construction of gauged BPS baby skyrmions inherent to a model in which the dynamics of the gauge field is controlled by the usual Maxwell term now multiplied by a nontrivial dielectric function. We introduce the theoretical context in which this investigation is inserted and present the lagrange density which defines the so-called Maxwell baby Skyrme...
We consider a Yang-Mills-Higgs theory with gauge group $G=SU(n)$ broken to $G_{v}= [SU(p) \times SU (n − p) \times U (1)]/Z$ by a Higgs field $\phi$ in the adjoint representation. We obtain monopole solutions whose magnetic field does not lie in the Cartan Subalgebra. And, since their magnetic field vanishes in the direction of the $U(1)_{em}$ electromagnetic group, we call them Dark...
The present work discusses elements of Appleton's model for magnetized plasmas in the context of the Maxwell-Carroll-Field-Jackiw (MCFJ) theory, endowed with a fixed 4-vector of Lorentz symmetry violation. We begin by reviewing the essential aspects of electromagnetic (EM) wave propagation in plasmas, analyzing scattering relations, refractive index, propagation modes, and the birefringence...
In this work we study how CPT-odd Maxwell-Carroll-Field-Jackiw (MCFJ) electrodynamics as well as a dimension-5 extension of it affect the optical activity of continuous media. The starting point is dimension-3 MCFJ electrodynamics in matter whose modified Maxwell equations, permittiv- ity tensor, and dispersion relations are recapitulated. Corresponding refractive indices are achieved in terms...
In this work, we investigate the existence of Anderson localization induced by a specific component of a binary Bose-Einstein condensate. We use a mean-field approach, such that only one type of particle is subject to a disordered quasiperiodic potential, which induces a localization in the partner field. Numerical simulations confirm the existence of Anderson localization in the partner field...
In this contribution, we present a short overview (in portuguese) about magnetic monopoles. We highlight the monopole solutions given by Dirac (1931), 't Hooft-Polyakov (1974) and Cho-Maison (1997). We conclude stating recent results.
In this talk we present an overview of non-local field theories, discussing its mains aspects, motivation and properties: we give some highlights on some application in QFT and also gravitational model.
