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Momentum

About: Momentum is a research topic. Over the lifetime, 19070 publications have been published within this topic receiving 367167 citations. The topic is also known as: linear momentum & translational momentum.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the curvature and the strain density of an atomic lattice generate the quantization of graphene sheets as well as the dynamics of geometric quasiparticles propagating along the constant curvature/strain levels.
Abstract: We discuss how the curvature and the strain density of an atomic lattice generate the quantization of graphene sheets as well as the dynamics of geometric quasiparticles propagating along the constant curvature/strain levels. The internal kinetic momentum of a Riemannian oriented surface (a vector field preserving the Gaussian curvature and the area) is determined.

5 citations

Posted Content
TL;DR: The existence of a hermitian time operator is proposed in the framework of non-relativistic quantum mechanics in this paper, where the Heisenberg equation of motion is shown to yield constant rate of flow of time.
Abstract: The existence of a hermitian time operator is proposed in the framework of non-relativistic quantum mechanics.The Heisenberg equation of motion is shown to yield constant rate of flow of time.It is shown to yield results consistent with classical expectations,when Bohr's correspondence principle is invoked.Further,it is shown that a massless free particle with non-zero momentum experiences timelessness in its own frame of reference whereas a negatively massive particle perceives forwardness of time.Moreover,application to quantum harmonic oscillators shows instantaneous transition of electrons from one eigenstate to another.

5 citations

Journal ArticleDOI
TL;DR: In this article, a low-order blade element momentum model, called flux line theory, is developed for predicting the performance of cycloturbines (variable-pitch vertical-axis wind turbines).
Abstract: In this paper, a novel low-order blade element momentum model, called flux-line theory, is developed for predicting the performance of cycloturbines (variable-pitch vertical-axis wind turbines). It...

5 citations

Journal ArticleDOI
TL;DR: In this paper, the Fourier-Bessel transformation is used to obtain analytical expressions for the momentum representation of relativistic Hartree-Fock-Roothaan wavefunctions.
Abstract: Analytical expressions for the momentum representation of the relativistic Hartree-Fock-Roothaan wavefunctions are obtained by means of the Fourier-Bessel transformation. The momentum distributions are calculated by the use of these expressions and the results are compared with the corresponding distributions of the nonrelativistic and relativistic hydrogenic wavefunctions as well as the nonrelativistic Hartree-Fock-Roothaan wavefunctions.

5 citations

Journal ArticleDOI
TL;DR: In this article, the decay Kp+→ep++πp0+ν has been studied with a heavy-liquid bubble chamber in order to identify the positron track and to detect and measure the electron-positron pairs from the materialization of the γ-rays.
Abstract: The decay Kp+→ep++πp0+ν has been studied with a heavy-liquid bubble chamber in order to identify the positron track and to detect and measure the electron-positron pairs from the materialization of the γ-rays. For comparison with our experimental data the various theoretical spectra have been modified by means of a Monte Carlo method for the variation of the detection efficiency and for measurement resolution. From this comparison, where radiation corrections have been taken into account, we can exclude a strong neutrino-positron asymmetry, which would have indicated a violation of lepton locality or a dominance of the mixed scalar-tensor term. the angular distribution of the neutrino momentum with respect to the pion momentum is completely consistent (28% χp2 probability) with a pure vector coupling. Pure scalar and tensor couplings are excluded with χp2 of 110.83 and ∼2500 respectively for 9 degrees of freedom. Possibile contribution to the decay from scalar and tensor terms are both less than 9%. Under the hypothesis of a pure vector coupling the structure of the form factor indicates a value of (700 −105 +185 ) MeV for the mass of the exchanged meson. From this value and from the decay rate obtained in this experiment [(4.19±0.42)·106 s−1], we get for the Cabibbo angle the value (12.82 −0.80 +0.90 ) degrees.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202214
2021886
2020709
2019705
2018647
2017709