Left-Right Entanglement Entropy of Dp-branes

We compute the left-right entanglement entropy for Dp-branes in string theory. We employ the CFT approach to string theory Dp-branes, in particular, its presentation as coherent states of the closed string sector. The entanglement entropy is computed as the von Neumann entropy for a density matrix resulting from integration over the left-moving degrees of freedom. We discuss various crucial ambiguities related to sums over spin structures and argue that different choices capture different physics; however, we advance a themodynamic argument that seems to favor a particular choice of replica. We also consider Dp branes on compact dimensions and verify that the effects of T-duality act covariantly on the Dp brane entanglement entropy. We find that generically the left-right entanglement entropy provides a suitable generalization of boundary entropy and of the D-brane tension.Comment: 20 pages, 3 figures. v2: A thermodynamic argument favoring a particular treatment of spin structures is advanced; one figure improved and references adde

Left-Right Entanglement Entropy of Boundary States

We study entanglement entropy of boundary states in a free bosonic conformal field theory. A boundary state can be thought of as composed of a particular combination of left and right-moving modes of the two-dimensional conformal field theory. We investigate the reduced density matrix obtained by tracing over the right-moving modes in various boundary states. We consider Dirichlet and Neumann boundary states of a free noncompact as well as a compact boson. The results for the entanglement entropy indicate that the reduced system can be viewed as a thermal CFT gas. Our findings are in agreement and generalize results in quantum mechanics and quantum field theory where coherent states can also be considered. In the compact case we verify that the entanglement entropy expressions are consistent with T-duality.Comment: 15 pages, no figures. v2 References added, typos fixe

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Introduction to computers and information systems

Based on the premise that information is essential to survival and that computers are essential to the best use of information, this book explains how computers and information system work, where they work, and how the affect society’s physical, political, and ethical environment. It is a reflection of our commitment to students and their need to prepare for the demands of the information age. Whether a student wishessimply to understand the use of computers and the role they play in today’s world, to work with computers to manage information n his or her own life, or to design information system, this text offers a comprehensive, up to date look at computers and their considerable impact

In Cold Blood and The Executioner\u27s Song: a generic reconception

In Cold Blood and The Executioner\u27s Song invite examination in that they represent polar versions of the nonfiction novel, an intriguing genre whose boundaries have yet to be adequately defined. Previous attempts to formulate a theory of the genre of the nonfiction novel by Tom Wolfe, John Hollowell, and John Hellmann have yielded useful contributions to a theoretical conception of the genre, but they fall short because the three studies neglect critical dimensions of genre theory. Additionally, the three theoretical conceptions exhibit difficulty in accounting for the factual content of novelistic works. The following thesis is an attempt to redefine the nonfiction novel in order to arrive at a renewed conception of In Cold Blood and The Executioner\u27s Song. The first section examines the theoretical formulations of the nonfiction novel offered by Wolfe, Hollowell, and Hellmann. A section on the genre theory of E. D. Hirsch and Mikhail Bakhtin suggests a means of arriving at a new conception of the nonfiction novel and leads to a succeeding section in which the nonfiction novel is redefined. The final section examines In Cold Blood and The Executioner\u27s Song in light of the approach derived from Hirsch and Bakhtin