scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
TL;DR: A set of symmetry relations with respect to bias voltage and magnetic field for the nonlinear conductance of two-terminal electric conductors are proposed and experimentally confirmed using phase-coherent, semiconductor quantum dots.
Abstract: The well-established symmetry relations for linear transport phenomena cannot, in general, be applied in the nonlinear regime. Here we propose a set of symmetry relations with respect to bias voltage and magnetic field for the nonlinear conductance of two-terminal electric conductors. We experimentally confirm these relations using phase-coherent, semiconductor quantum dots.

131 citations

Journal ArticleDOI
TL;DR: In this article, effective elastic coefficients for wave propagation obeying all of the classical symmetry relations βijkm=βkmij=βjikm=βijmk= … can be defined for crystals of any symmetry under positive or negative hydrostatic pressure.
Abstract: Effective elastic coefficients for wave propagation obeying all of the classical symmetry relations βijkm=βkmij=βjikm=βijmk= … can be defined for crystals of any symmetry under positive or negative hydrostatic pressure. For other states of stress, the full symmetry is lost, even in isotropic materials. The loss of the full symmetry commonly expected of elastic coefficients has a simple physical interpretation the case of uniaxial stress in an isotropic medium. A transverse wave propagates faster in the direction of tension than in the perpendicular direction because tension increases the restoring force for displacements associated with the former wave, just as in a stretched string. The difference in ρV2 for the two waves equals the tensile stress. Hence, the corresponding effective elastic coefficients, which would be equal under the classical symmetry, also differ by this same amount. In this paper, we define effective elastic coefficients and express them in terms of the stress, the deformation result...

131 citations

Journal ArticleDOI
TL;DR: In this paper, the authors derive the Ward identities which relate the three point function of scalar perturbations produced during inflation to the scalar four point function, in a particular limit.
Abstract: Using symmetry considerations, we derive Ward identities which relate the three point function of scalar perturbations produced during inflation to the scalar four point function, in a particular limit. The derivation assumes approximate conformal invariance, and the conditions for the slow roll approximation, but is otherwise model independent. The Ward identities allow us to deduce that the three point function must be suppressed in general, being of the same order of magnitude as in the slow roll model. They also fix the three point function in terms of the four point function, upto one constant which we argue is generically suppressed. Our approach is based on analyzing the wave function of the universe, and the Ward identities arise by imposing the requirements of spatial and time reparametrization invariance on it.

131 citations

Journal ArticleDOI
TL;DR: Experimental evidence of broken time-reversal symmetry for the interaction of light with an artificial nonmagnetic material is reported and has some striking resemblance with the expected features of light scattering on anyon matter.
Abstract: We report unambiguous experimental evidence of broken time-reversal symmetry for the interaction of light with an artificial nonmagnetic material. Polarized color images of planar chiral gold-on-silicon nanostructures consisting of arrays of gammadions show intriguing and unusual symmetry: structures, which are geometrically mirror images, lose their mirror symmetry in polarized light. The symmetry of images can be described only in terms of antisymmetry (black-and-white symmetry) appropriate to a time-odd process. The effect results from a transverse chiral nonlocal electromagnetic response of the structure and has some striking resemblance with the expected features of light scattering on anyon matter.

130 citations


Network Information
Related Topics (5)
Supersymmetry
29.7K papers, 1.1M citations
86% related
Gauge theory
38.7K papers, 1.2M citations
86% related
General relativity
29K papers, 810.8K citations
85% related
Higgs boson
33.6K papers, 961.7K citations
84% related
Gravitation
29.3K papers, 821.5K citations
84% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202217
20211,679
20201,178
20191,006
20181,040
2017939