176 citations · 485 across the 33 of their papers we have counts for
33 papers
Bound states in a semi-infinite square potential well
Nivaldo A. Lemos
The finite square potential well is a staple problem in introductory quantum mechanics. There is an extensive literature on the determination of the allowed energies, which require…
Probing time orientability of spacetime
N. A. Lemos, D. Müller, M. J. Reboucas
In general relativity, cosmology and quantum field theory, spacetime is assumed to be an orientable manifold endowed with a Lorentz metric that makes it spatially and temporally or…
Orientability of space from electromagnetic quantum fluctuations
N. A. Lemos, M. J. Reboucas
Whether the space where we live is a globally orientable manifold , and whether the local laws of physics require that be equipped with a canonical orientation, are amon…
Breakdown of the connection between symmetries and conservation laws for semiholonomic systems
Nivaldo A. Lemos
Integrable velocity-dependent constraints are said to be semiholonomic. For good reasons, holonomic and semiholonomic constraints are thought to be indistinguishable in Lagrangian…
Probing spatial orientability of Friedmann--Robertson--Walker spatially flat spacetime
N. A. Lemos, D. Müller, M. J. Reboucas
One important global topological property of a spacetime manifold is orientability. It is widely believed that spatial orientability can only be tested by global journeys around th…
Complete inequivalence of nonholonomic and vakonomic mechanics: rolling coin on an inclined plane
Nivaldo A. Lemos
Vakonomic mechanics has been proposed as a possible description of the dynamics of systems subject to nonholonomic constraints. The aim of the present work is to show that for an i…