Topic
Symmetry (physics)
About: Symmetry (physics) is a research topic. Over the lifetime, 26435 publications have been published within this topic receiving 500189 citations. The topic is also known as: symmetry (physics) & physical symmetry.
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TL;DR: In this paper, the Hohenberg-Kohn energy functional was used to construct isoscalar and isovector densities for a half-infinite particle-stable nuclear-matter.
189 citations
TL;DR: In this paper, a generation mechanism of the quark and lepton masses in gauge models with horizontal symmetry is proposed, based on the mixing of quark-lepton families with heavy horizontal fermions, acquiring large masses directly after breaking of horizontal symmetry.
188 citations
TL;DR: The standard test statistic for Slutsky symmetry is biased toward rejection of the null hypothesis, particularly for large demand equation systems as discussed by the authors, which is a common assumption for many demand equations.
188 citations
TL;DR: In this article, the Kawai-Lewellen-Tye relations that link products of gauge theory amplitudes to gravity amplitudes at tree level were shown to be symmetric.
Abstract: Using only general features of the S matrix and quantum field theory, we prove by induction the Kawai-Lewellen-Tye relations that link products of gauge theory amplitudes to gravity amplitudes at tree level. As a bonus of our analysis, we provide a novel and more symmetric form of these relations. We also establish an infinite tower of new identities between amplitudes in gauge theories.
188 citations
TL;DR: In this paper, the existence of diagonal symmetry in estimates of overall stiffness tensors of heterogeneous media is examined for several micromechanical models, and the equivalence of two possible approaches to evaluation of the overall thermal stress and strain tensors is raised.
Abstract: T he existence of diagonal symmetry in estimates of overall stiffness tensors of heterogeneous media is examined for several micromechanical models. The dilute approximation gives symmetric estimates for all matrix-based multiphase media. The Mori-Tanaka and the self-consistent methods do so for all two-phase systems, but only for those multiphase systems where the dispersed inclusions have a similar shape and alignment. However, the differential schemes associated with the self-consistent method can predict diagonally symmetric overall stiffness and compliance for multiphase systems of arbitrary phase geometry. A related question is raised about the equivalence of two possible approaches to evaluation of the overall thermal stress and strain tensors. A direct estimate follows from each of the above models, whereas L evin 's results [ Mechanics of Solids 2 , 58 (1967)] permit an indirect evaluation in terms of the estimated overall mechanical properties or concentration factors and phase thermoelastic moduli. These two results are shown to coincide for those systems and models which return diagonally symmetric estimates of the overall stiffness. Finally, model predictions of the overall elastic symmetry of composite media are discussed with regard to the spatial distribution of the phases.
188 citations