Zobrazeno 1 - 10
of 172
pro vyhledávání: '"da Providência, João P."'
The relevance in Physics of non-Hermitian operators with real eigenvalues is being widely recognized not only in quantum mechanics but also in other areas, such as quantum optics, quantum fluid dynamics and quantum field theory. %stochastic processes
Externí odkaz:
http://arxiv.org/abs/2004.07205
The higher rank numerical ranges of generic matrices are described in terms of the components of their Kippenhahn curves. Cases of tridiagonal (in particular, reciprocal) 2-periodic matrices are treated in more detail.
Comment: 14 pages, 10 figu
Comment: 14 pages, 10 figu
Externí odkaz:
http://arxiv.org/abs/2104.07893
Autor:
Nishiyama, Seiya, da Providencia, Joao
The integrability-condition method is regarded as a mathematical tool to describe the symmetry of collective sub-manifold. We here adopt the particle-hole representation. In the conventional time-dependent (TD) self-consistent field (SCF) theory, we
Externí odkaz:
http://arxiv.org/abs/2101.00206
The stability of four fermionic particles with unit charge, of which, two are positively, and two negatively charged, is discussed. Except for using the simplest approximation of a single Gaussian orbital per particle, the problem is exactly solved v
Externí odkaz:
http://arxiv.org/abs/1908.06175
Non-Hermitian Hamiltonians possessing a discrete real spectrum motivated a remarkable research activity in quantum physics and new insights have emerged. In this paper we formulate concepts of statistical thermodynamics for systems described by non-H
Externí odkaz:
http://arxiv.org/abs/1907.13221
This paper deals with the mathematical spectral analysis and physical interpretation of a fermionic system described by a non-Hermitian Hamiltonian possessing real eigenvalues. A statistical thermodynamical description of such a system is considered.
Externí odkaz:
http://arxiv.org/abs/1907.09347
Tridiagonal matrices with constant main diagonal and reciprocal pairs of off-diagonal entries are considered. Conditions for such matrices with sizes up to 6-by-6 to have elliptical numerical ranges are obtained.
Comment: 20 pages, 4 figures
Comment: 20 pages, 4 figures
Externí odkaz:
http://arxiv.org/abs/2011.00849
Autor:
Rabhi, Aziz, Providência, Constança, Moszkowski, Steven A., da Providência, João, Bohr, Henrik
Publikováno v:
Phys. Rev. C 103, 035811 (2021)
A quark-meson coupling model based on the quark model proposed by Bogoliubov for the description of the quark dynamics is developed and applied to the description of neutron stars. Starting from a su(3) symmetry approach, it is shown that this symmet
Externí odkaz:
http://arxiv.org/abs/2009.05370
A theory of thermodynamics has been recently formulated and derived on the basis of R\'enyi entropy and its relative versions. In this framework, we define the concepts of partition function, internal energy and free energy, and fundamental quantum t
Externí odkaz:
http://arxiv.org/abs/1706.00442
Autor:
Panda, Prafulla K., Providência, Constança, Moszkowski, S. A., Bohr, H., da Providência, João
We generalize the Bogoliubov quark-meson coupling model to also include hyperons. The hyperon-$\sigma$-meson couplings are fixed by the model and the hyperon-$\omega$-meson couplings are fitted to the hypreon potentials in symmetric nuclear matter. T
Externí odkaz:
http://arxiv.org/abs/1810.12191