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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the chiral restoration phase transition in hot and/or dense hadronic matter is discussed in terms of the BR scaling based on chiral symmetry and scale anomaly of QCD.

206 citations

Journal ArticleDOI
TL;DR: In this article, the Susskind fermionic action is expressed explicitly in terms of flavour Dirac fields defined on hypercubes in position space, and the decay constant of the pseudo-scalar Goldstone boson associated with spontaneous breakdown of the U(1) A symmetry is derived.

206 citations

Journal ArticleDOI
TL;DR: In this paper, general symmetry principles for rotor-synchronized pulse sequences in magic-angle spinning solid-state nuclear magnetic resonance are presented for the first time, and a number of specific pulse sequences based on these principles are listed.
Abstract: General symmetry principles for rotor-synchronized pulse sequences in magic-angle spinning solid-state nuclear magnetic resonance are presented. The theory of symmetry-based pulse sequences using π pulse elements is presented for the first time. The symmetry theory is extended to the case of generalized Hartmann–Hahn sequences, in which rotor-synchronized rf irradiation is applied simultaneously to two isotopic spin species. The symmetry principles lead to heteronuclear selection rules. The symmetry theory is used to design pulse sequences which implement heteronuclear dipolar recoupling at the same time as decoupling homonuclear spin–spin interactions, and which also suppress chemical shift anisotropies. A number of specific pulse sequences based on these principles are listed. Experimental demonstrations are given of heteronuclear two-dimensional correlation spectroscopy, heteronuclear multiple-quantum spectroscopy, and the estimation of internuclear dipolar couplings.

206 citations

Journal ArticleDOI
TL;DR: In a generic supersymmetric extension of the Standard Model, whether unified or not, a simple and well motivated U(2) symmetry, acting on the lightest two generations, completely solves the flavour changing problem and leads to a predictive texture for the Yukawa couplings as discussed by the authors.
Abstract: In a generic supersymmetric extension of the Standard Model, whether unified or not, a simple and well motivated U(2) symmetry, acting on the lightest two generations, completely solves the flavour changing problem and necessarily leads to a predictive texture for the Yukawa couplings.

205 citations

Journal ArticleDOI
TL;DR: In this paper, a mechanism of symmetry transition upon compactification of a 5-dimensional field theory on $S^1/Z_2 was studied, where all components in a multiplet of a symmetry group have a common parity on the field theory.
Abstract: We study a mechanism of symmetry transition upon compactification of a 5-dimensional field theory on $S^1/Z_2$. The transition occurs unless all components in a multiplet of a symmetry group have a common $Z_2$ parity on $S^1/Z_2$. This mechanism is applied to a reduction of SU(5) gauge symmetry in grand unified theory, and phenomenological implications are discussed.

204 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202217
20211,679
20201,178
20191,006
20181,040
2017939