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In this paper, we discuss the simple current orbifold of a rational Narain CFT (Narain RCFT). This is a method of constructing other rational CFTs from a given rational CFT, by 'orbifolding' the global symmetry formed by a particular primary fields (called the simple current). Our main result is that a Narain RCFT satisfying certain conditions can be described in the form of a simple current orbifold of another Narain RCFT, and we have shown how the discrete torsion in taking that orbifold is obtained. Additionally, the partition function can be considered a simple current orbifold with discrete torsion, which is determined by the lattice and the B-field. We establish that the partition function can be expressed as a polynomial, with the variables substituted by certain q -series. In a specific scenario, this polynomial corresponds to the weight enumerator polynomial of an error-correcting code. Using this correspondence to the code theory, we can relate the B-field, the discrete torsion, and the B-form to each other. [ABSTRACT FROM AUTHOR]

We recently proposed a class of type IIB vacua that yield, at low energies, four–dimensional Minkowski spaces with broken supersymmetry and a constant string coupling. They are compactifications with an internal five-torus bearing a five–form flux Φ and warp factors depending on a single coordinate. The breaking of supersymmetry occurs when the internal space includes a finite interval. A probe-brane analysis revealed a gravitational repulsion and a charge attraction of equal magnitude from the left end of the interval, together with a singularity at the other end. Here we complete the analysis revealing the presence, at one end, of an effective O 3 of negative tension and positive five–form charge. We also determine the values of these quantities, showing that T = − Q = Φ , and characterize the singularity present at the other end of the interval, which hosts an opposite charge. Finally, we discuss various forms of the gravity action in the presence of a boundary and identify a self–adjoint form for its fluctuations. Invited contribution to the special issue of Journal of Physics A: Mathematical and Theoretical on 'Fields, Gravity, Strings and Beyond: In Memory of Stanley Deser' [ABSTRACT FROM AUTHOR]

This document is a preface to a journal article titled "Claritons and the asymptotics of ideas: the physics of Michael Berry." The article discusses the work and contributions of Michael Berry, a physicist known for his discoveries in the borderland between different theories, such as quantum and classical mechanics, and wave and geometric optics. Berry's approach to mathematical physics emphasizes exploration and explication over rigorous proof, and his ideas have found applications in various fields, including condensed matter physics, quantum information, high-energy physics, optics, and mathematics. The preface is written by Mark Dennis, Christopher Howls, Jonathan Robbins, and Pragya Shukla, who express their regard and affection for Berry and edit this volume dedicated to his 80th birthday. [Extracted from the article]