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What is symmetry in physics?
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In physics, a symmetry of a physical system is a physical or mathematical feature of the system (observed or intrinsic) that is preserved or remains unchanged under some transformation .
52–1 Symmetry operations. The subject of this chapter is what we may call symmetry in physical laws. We have already discussed certain features of symmetry in physical laws in connection with vector analysis (Chapter 11 ), the theory of relativity (Chapter 16 ), and rotation (Chapter 20 ).
Symmetry is the concept that the properties of particles remain unchanged after certain transformations. Learn how symmetry applies to relativity, quantum mechanics, conservation laws, and subatomic particles.
- The Editors of Encyclopaedia Britannica
Dec 10, 1996 · With the development of quantum mechanics in the 1920s symmetry principles came to play an even more fundamental role. In the latter half of the 20th century symmetry has been the most dominant concept in the exploration and formulation of the fundamental laws of physics.
Apr 24, 2022 · Symmetries and Variables. In modern quantum physics, the discovery of new symmetries leads to new dynamical variables. In the problems we show how that comes about for the symmetries of parity (x → − x), time reversal t → − t), and charge conjugation (the interchange of particles with antiparticles).
17–1 Symmetry. In classical physics there are a number of quantities which are conserved —such as momentum, energy, and angular momentum. Conservation theorems about corresponding quantities also exist in quantum mechanics.
Symmetry in physics has been generalized to mean invariance—that is, lack of change—under any kind of transformation, for example arbitrary coordinate transformations. This concept has become one of the most powerful tools of theoretical physics, as it has become evident that practically all laws of nature originate in symmetries.
