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: This work presents a new general mechanism to generate curvature perturbations after the end of the slow-roll phase of inflation based on the simple assumption that the potential driving inflation is characterized by an underlying global symmetry which is slightly broken.
Abstract: We present a new general mechanism to generate curvature perturbations after the end of the slow-roll phase of inflation. Our model is based on the simple assumption that the potential driving inflation is characterized by an underlying global symmetry which is slightly broken.
96 citations
TL;DR: In this article, the authors used supertwistor space to construct scattering amplitudes of maximal superconformal theories in three and six dimensions, and showed that the three-point amplitude vanishes on-shell.
Abstract: We use supertwistor space to construct scattering amplitudes of maximal superconformal theories in three and six dimensions. In both cases, the constraints of superconformal invariance and rationality imply that the three-point amplitude vanishes on-shell, which constrains the four-point amplitude to have vanishing residues in all channels. In three dimensions, we nd a unique solution for the four-point amplitude and demonstrate that it agrees with the component result in the BLG theory. This suggests that BLG is the unique three-dimensional theory with classical OSp(8|4) symmetry that admits a Lagrangian
description. We also show that one can derive the four-point amplitude of the ABJM theory from our N = 8 result by reducing the supersymmetry, which implies that
the tree-level Yangian symmetry recently found in ABJM is also present in BLG. In six dimensions, we find that the consistency conditions imply that all tree-level amplitudes
vanish. This leads us to conjecture that an interacting six-dimensional theory with classical OSp(8|4) symmetry does not have a Lagrangian description, local or nonlocal, unless the (2, 0) tensor multiplets are supplemented by additional degrees of freedom.
96 citations
TL;DR: In this paper, the problem of the accumulation and storage of the energy released in solar flares is discussed; it is proposed that convective energy of the photosphere is transformed into magnetic energy of chromosphere and corona and the consequences of a large ratio of magnetic pressure to gas pressure are investigated.
Abstract: The problem of the accumulation and storage of the energy released in solar flares is discussed; it is proposed that convective energy of the photosphere is transformed into magnetic energy of the chromosphere and corona. The consequences of a large ratio of magnetic pressure to gas pressure are investigated. In this case the field must be approximately force-free. The only suitable force-free fields which allow an analytical treatment are those of cylindrical symmetry. The stability of these fields is studied with the energy principle. It is shown that they are always unstable due to kink type instabilities. The shape of the unstable perturbations is described in detail and an upper limit for their amplitude is estimated. The consequences for the proposed mechanism of energy storage are briefly discussed.
96 citations
TL;DR: In this article, the authors generalize to molecules devoid of symmetry the phenomenological treatment of depolarization of the fluorescence by the Brownian rotations of a spherical molecule due to Spencer and Weber.
Abstract: In this paper, we generalize to molecules devoid of symmetry the phenomenological treatment of depolarization of the fluorescence by the Brownian rotations of a spherical molecule due to Spencer and Weber. There are six ways in which a system of orthogonal coordinates rigidly bound to the molecule may be made to coincide with the laboratory coordinates. The transitions between these permissible orientations gives rise to a system of six differential equations of transport, the solution of which entails that of a differential equation of sixth order. However, because of the equivalence of some of the rotations as regards the depolarizing effects, on account of the symmetry conditions, the solution of a differential equation of third order is only necessary. Consequently, after an instantaneous light pulse, a polarized component of the fluorescence will show a maximum of three exponential decays and the difference of parallel and perpendicular components a maximum of only two decays. The steady‐state fluore...
96 citations
TL;DR: In this article, the Nother Symmetry Approach is used to study the Einstein equations minimally coupled with a scalar field, in the case of Bianchi universes of class A and B.
Abstract: We use our Nother Symmetry Approach to study the Einstein equations minimally coupled with a scalar field, in the case of Bianchi universes of class A and B. Possible cases, when such symmetries exist, are found and two examples of exact integration of the equations of motion are given in the cases of Bianchi AI and BV.
95 citations