26 documents found, page 1 of 3
Tensor coupling and pseudospin symmetry in nuclei
Alberto, P.; Lisboa, R.; Malheiro, M.; De Castro, A. S. [UNESP]Made available in DSpace on 2022-04-28T19:59:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-01-01; In this work we study the contribution of the isoscalar tensor coupling to the realization of pseudospin symmetry in nuclei. Using realistic values for the tensor coupling strength, we show that this coupling reduces noticeably the pseudospin splittings, especially for single-particle levels near the Fe...
Relating pseudospin and spin symmetries through charge conjugation and chiral t...
Castro, A. S. De [UNESP]; Alberto, P.; Lisboa, R.; Malheiro, M.Made available in DSpace on 2022-04-28T20:07:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-01; We solve the generalized relativistic harmonic oscillator in 1+1 dimensions, i.e., including a linear pseudoscalar potential and quadratic scalar and vector potentials which have equal or opposite signs. We consider positive and negative quadratic potentials and discuss in detail their bound-state solut...
Superconducting quark matter in the Chromodielectric Model
Linares, L.; Malheiro, M.; Fiolhais, M.; Taurines, A. R. [UNESP]Made available in DSpace on 2022-04-28T20:17:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-12-02; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação para a Ciência e a Tecnologia; In this work we study the strange quark matter in an extented version of the Chromodielectric Model (CDM) with a BCS quark pa...
General spin and pseudospin symmetries of the Dirac equation
Alberto, P.; Malheiro, M.; Frederico, T.; De Castro, A. [UNESP]Made available in DSpace on 2022-04-28T19:02:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-12-31; In the 1970s Smith and Tassie [G. B. Smith and L. J. Tassie, Ann. Phys. (NY) 65, 352 (1971)APNYA60003-491610.1016/0003-4916(71)90172-2] and Bell and Ruegg [J. S. Bell and H. Ruegg, Nucl. Phys. B 98, 151 (1975)NUPBBO0550-321310.1016/0550-3213(75)90206-0; J. S. Bell and H. Ruegg, Nucl. Phys. B 104, 546 (1...
Spin and pseudospin symmetries in the antinucleon spectrum of nuclei
Lisboa, R.; Malheiro, M.; Alberto, P.; Fiolhais, M.; De Castro, A. S. [UNESP]Made available in DSpace on 2022-04-28T21:02:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-28; Spin and pseudospin symmetries in the spectra of nucleons and antinucleons are studied in a relativistic mean-field theory with scalar and vector Woods-Saxon potentials, in which the strength of the latter is allowed to change. We observe that, for nucleons and antinucleons, the spin symmetry is of pert...
Pseudospin symmetry and the relativistic harmonic oscillator
Lisboa, R.; Malheiro, M.; de Castro, A. S. [UNESP]; Alberto, P.; Fiolhais, M.Made available in DSpace on 2022-04-29T08:14:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-01-01; A generalized relativistic harmonic oscillator for spin 1/2 particles is studied. The Dirac Hamiltonian contains a scalar [Formula Presented] and a vector [Formula Presented] quadratic potentials in the radial coordinate, as well as a tensor potential [Formula Presented] linear in [Formula Presented]. S...
Kinematic constraints on spatial curvature from supernovae Ia and cosmic chrono...
Jesus, J. F. [UNESP]; Valentim, R.; Moraes, P. H.R.S.; Malheiro, M.Made available in DSpace on 2021-06-25T10:50:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01; An approach to estimate the spatial curvature ωk from data independently of dynamical models is suggested, through kinematic parametrizations of the comoving distance [DC(z)] with third-degree polynomial, of the Hubble parameter [H(z)] with a second-degree polynomial and of the deceleration parameter [q...
Induced equation of state for the universe epochs constrained by the hubble par...
Lapola, M. M.; Moraes, P. H.R.S.; de Paula, W.; Jesus, J. F. [UNESP]; Valentim, R.; Malheiro, M.Made available in DSpace on 2021-06-25T11:00:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-08-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); We present a five dimensional cosmological metric that reveals a four-dimensional energy-momentum tens...
Antinucleon spectra in the Dirac equation with scalar and vector Wood-Saxon pot...
Lisboa, R.; Malheiro, M.; Alberto, P.; Castro, A. S. de [UNESP]; Guimaraes, V; BrandaoDeOliveira, JR; Macario, KCD; Genezini, F. A.Made available in DSpace on 2020-12-10T16:35:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); We analyze here the spin and pseudospin symmetry for the antinucleon spectra solving the Dirac equation with scalar and vector Wood-Saxon potentials. In relativistic nucle...
Relativistic pseudospin and spin symmetries in physical systems - recent results
Alberto, P.; Castro, A. [UNESP]; Fiolhais, M.; Lisboa, R.; Malheiro, M.; Vagenas, E. C.; Vlachos, D. S.Made available in DSpace on 2019-10-04T12:29:36Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01; In this paper we revise the main features of pseudospin and spin symmetries of the Dirac equation with scalar and vector potentials and mention several of its applications to physical systems. These symmetries have been extensively researched in the last 15 years, especially pseudospin symmetry, mainly ...