Citation Hohm, Olaf, and Barton Zwiebach. "Double metric, generalized metric, and-deformed double field theory. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We ...

We systematically study the field equations of $f(\mathbb Q)$ gravity for spherically symmetric and stationary metric-affine spacetimes. Such spacetimes are described by a metric as well flat torsionless affine connection. In Symmetric Teleparallel Equivalent GR (STEGR), connection is pure gauge hence unphysical. However, in non-linear extension $f(\Q)$, it promoted to dynamical which changes p...

New examples of the theory recently proposed by Ricca [PRA(1991)] on the generalization of Da RiosBetchov intrinsic equations on curvature and torsion of classical non-Riemannian vortex higher-dimensional string are given. In particular we consider applications to 3-dimesional fluid dynamics, including the case of a twisted flux tube and the fluid rotation. In this case use is made of Da Rios e...

Starting from gravity as a Chern–Simons action for the AdS algebra in five dimensions, it is possible to deform the theory through an expansion of the Lie algebra that leads to a system consisting of the Einstein–Hilbert action plus nonminimally coupled matter. The deformed system is gauge invariant under the Poincaré group enlarged by an Abelian ideal. Although the resulting action naively loo...

Let R be a ring. An element a in R is called left morphic (Nicholson and Sánchez Campos, 2004a) if l a R/Ra, where l a denotes the left annihilator of a in R. The ring itself is called a left morphic ring if every element is left morphic. Left morphic rings were first introduced by Nicholson and Sánchez Campos (2004a) and were discussed in great detail there and in Nicholson and Sánchez Campos ...

Starting from the dual action of (4, 4) 2D twisted multiplets in the harmonic superspace with two independent sets of SU(2) harmonic variables, we present its generalization which hopefully provides an off-shell description of general (4, 4) supersymmetric sigma models with torsion. Like the action of the torsionless (4, 4) hyper-Kähler sigma models in the standard harmonic superspace, it is ch...

We analyze three-body decays of and . Under the factorization approach, there are tree level diagrams for these decay modes and the transition matrix element of decay is factorized into a form factor multiplied by decay constant and form factor multiplied into weak vertices form factor. The transition matrix element of decay is also factorized into a form factor multiplied into weak vertic...

The solutions of Einstein’s equations admitting one non-null Killing vector field are best studied with the projection formalism of Geroch. When the Killing vector is lightlike, the projection onto the orbit space still exists and one expects a covariant theory with degenerate contravariant metric to appear, its geometry is presented here. Despite the complications of indecomposable representat...

Over the last years some interest has been gathered by $f(Q)$ theories, which are new candidates to replace Einstein's prescription for gravity. The nonmetricity tensor $Q$ allows put forward assumption of a free torsionless connection and, consequently, degrees freedom in action taken into account. This work focuses on class characterized presence general power-law term adds up standard (linea...