Mercado-Gutiérrez, E. D. Poveda-Cuevas, F. J. Bagnato, V. S.
Published in
Brazilian Journal of Physics

We report the measurement of the global thermal expansion coefficient of a confined Bose gas of 87Rb in a harmonic potential around the Bose-Einstein condensation transition temperature. We use the concept of global thermodynamic variable, previously introduced and appropriated for a non-homogeneous system. We observe the behavior of the thermal ex...

Savi, Matheus F. Angelo, Renato M.
Published in
Brazilian Journal of Physics

The special theory of relativity teaches us that, although distinct inertial frames perceive the same dynamical laws, space and time intervals differ in value. We revisit the problem of time contraction using the paradigmatic model of a fast-moving laboratory within which a photon is emitted and posteriorly absorbed. In our model, however, the labo...

Ghizoni, Henrique S. Amorim, Edgard P. M.
Published in
Brazilian Journal of Physics

We investigate the transport properties and entanglement between spin and position of one-dimensional quantum walks starting from a qubit over position states following a delta-like (local state) and Gaussian (delocalized state) distributions. We find out that if the initial state is delocalized enough and a NOT gate reflects this state backwards, ...

do Nascimento, Fellype Moshkalev, Stanislav Machida, Munemasa
Published in
Brazilian Journal of Physics

Dielectric barrier discharge (DBD) plasma jets have been studied extensively in recent years because of its wide range of applications. DBD plasmas can be produced using many different gases and can be applied to a broad variety of surfaces and substrates. This work provides comparisons of DBD plasmas generated using argon (Ar), helium (He), and ni...

da Silva, G. Pordeus Cavalcanti, A. G.
Published in
Brazilian Journal of Physics

In order to clarify the tension between estimates of the Hubble Constant (H0) from local (z ≪ 1) and global (z ≫ 1) measurements, Lima and Cunha (LC) proposed a new method to measure H0 in intermediate redshifts (z ≈ 1), which were obtained H0 = 74.1 ± 2.2 km s− 1Mpc− 1 (1σ), in full agreement to local measurements via Supernovae/Cepheid dataset. H...

Ramos, José G. Rodrigues, Clóves G. Silva, Carlos A. B. Luzzi, Roberto
Published in
Brazilian Journal of Physics

Hydrodynamics, a term apparently introduced by Daniel Bernoulli (1700–1783) to comprise hydrostatic and hydraulics, has a long history with several theoretical approaches. Here, after a descriptive introduction, we present so-called mesoscopic hydro-thermodynamics, which is also referred to as higher order generalized hydrodynamics, built within th...

Moreira Jr., E. S.
Published in
Brazilian Journal of Physics

This paper investigates further how the presence of a single reflecting plane wall modifies the usual Planckian forms in the thermodynamics of the massless scalar radiation in N-dimensional Minkowski spacetime. This is done in a rather unconventional way by integrating the energy density over space to obtain the internal energy and from that the He...

Singh, Deobrat Kar, Supriya
Published in
Brazilian Journal of Physics

We revisit a non-perturbative formulation leading to a vacuum-created gravitational pair of (33̄)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$(3\bar {3})$\end{documen...

Hashemi, S.
Published in
Brazilian Journal of Physics

Using Monte Carlo simulation in NVT ensemble, the behavior of hard ellipses confined in a square with hard walls, is analyzed here. Three different aspect ratios are used for confined ellipses. It is seen that confining can create especial configurations, e.g., elastic and bridge arrangements, or some defects in nematic phases. This phenomenon depe...

Oliveira, R. R. S. Sousa, M. F.
Published in
Brazilian Journal of Physics

In this work, we study the (2 + 1)-dimensional Dirac equation for a neutral fermion with magnetic dipole moment in the presence of an electromagnetic field. Next, we explicitly determine the eigenfunctions and the relativistic energy spectrum of the fermion. As result, we verified that these eigenfunctions are written in terms of the generalized La...