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 article, the authors show that the scalar sector is invariant under special conformal transformations, which shift the curvature perturbation by a term linear in the spatial coordinates.
Abstract: We remark on the existence of non-linearly realized conformal symmetries for scalar adiabatic perturbations in cosmology. These conformal symmetries are present for any cosmological background, beyond any slow-roll or quasi-de Sitter approximation. The dilatation transformation shifts the curvature perturbation by a constant, and corresponds to the well-known symmetry under spatial rescaling. We argue that the scalar sector is also invariant under special conformal transformations, which shift the curvature perturbation by a term linear in the spatial coordinates. We discuss whether these conformal symmetries can be extended to include tensor perturbations. Tensor modes introduce their own set of non-linearly realized symmetries. We identify an infinite set of large gauge transformations which maintain the transverse, traceless gauge condition, while shifting the tensor mode non-trivially.
177 citations
TL;DR: In this paper, the authors studied the action of diffeomorphisms on spin foam models and showed that in 3 dimensions, there is a residual action that explains the naive divergences of state sum models.
176 citations
TL;DR: In this article, the authors study the cosmology of the Supersymmetric Standard Model augmented by a gauge singlet to solve the μ-problem and describe the evolution of the domain walls which are created during electroweak symmetry breaking due to the discrete Z 3 symmetry in this model.
176 citations
TL;DR: In this paper, an expansion for the Green functions describing electromagnetic waves in the presence of a perfectly conducting boundary is established for any smooth boundary in the domain Im k ⩾ | Re k | of complex wavenumbers k, and the continuation of the convergence domain around k = 0 is shown to depend upon the topology of the boundary.
176 citations
TL;DR: A metastable phase with the point group symmetry m35 was found in rapidly quenched (Ti 1−xVx)2Ni alloys with × = 00-0-3 by electron diffraction and high-resolution electron microscopy as discussed by the authors.
Abstract: A metastable phase with the point group symmetry m35 but no ordinary translation symmetry has been found in rapidly quenched (Ti 1−xVx)2Ni alloys with × = 00-0-3 by electron diffraction and high-resolution electron microscopy.
176 citations