88 citations · 600 across the 68 of their papers we have counts for
5 papers · 1 filter
The Landau Problem and non-Classicality
G. X. A. Petronilo, S. C. Ulhoa, K. V. S. Araújo +3
Exploring the concept of the extended Galilei group G. Representations for field theories in a symplectic manifold have been derived in association with the method of the Wigner fu…
Spin-1/2 particles in Phase space: Casimir effect and Stefan-Boltzmann law at finite temperature
R. G. G. Amorim, S. C. Ulhoa, J. S da Cruz Filho +2
The Dirac field, spin 1/2 particles, is investigated in phase space. The Dirac propagator is defined. The Thermo Field Dynamics (TFD) formalism is used to introduce finite temperat…
On Stefan-Boltzmann law and the Casimir effect at finite temperature in the Schwarzschild spacetime
A. F. Santos, S. C. Ulhoa, Faqir C. Khanna
This paper deals with quantum field theory in curved space-time using the Thermo Field Dynamics. The scalar field is coupled to the Schwarzschild space time and then thermalised. T…
Casimir effect and Stefan-Boltzmann law at finite temperature in a Friedmann-Robertson-Walker universe
A. F. Santos, S. C. Ulhoa, Faqir C. Khanna
A spatially flat Friedmann-Robertson-Walker background with a general scale factor is considered. In this space-time, the energy-momentum tensor of the scalar field with a general…
On the Quantization of Burgers Vector and Gravitational Energy in the Space-Time of a Conical Defect
F. L. Carneiro, S. C. Ulhoa, J. F. da Rocha-Neto +1
A conical topological defect is the result of translational and/or rotational deformations of spacetime, in particular the Burgers vector describes the translational deformation. S…