Spectral Spaces

Offers a comprehensive presentation of spectral spaces focussing on their topology and close connections with algebra, ordered structures, and logic.

This anthology explores the spatial dimension and politics of haunting. It considers how the ‘appearance’ of absence, emptiness and the imperceptible can indicate an overwhelming presence of something that once was, and still is, (t)here. At its core, the book asks: how and why do certain places haunt us? Drawing from a diversity of mediums, forms and disciplinary approaches, the contributors to Spectral Spaces and Hauntings illustrate the complicated ways absent presences can manifest and be registered. The case studies range from the memory sites of a terrorist attack, the lost home, a vanished mining town and abandoned airports, to the post-apocalyptic wastelands in literary fiction, the photographic and filmic surfaces where spectres materialise, and the body as a site for re-corporealising the disappeared and dead. In ruminating on the afteraffects of spectral spaces on human experience, the anthology importantly foregrounds the ethical and political imperative of engaging with ghosts and following their traces.

This anthology explores the spatial dimension and politics of haunting. It considers how the ‘appearance’ of absence, emptiness and the imperceptible can indicate an overwhelming presence of something that once was, and still is, (t)here. At its core, the book asks: how and why do certain places haunt us? Drawing from a diversity of mediums, forms and disciplinary approaches, the contributors to Spectral Spaces and Hauntings illustrate the complicated ways absent presences can manifest and be registered. The case studies range from the memory sites of a terrorist attack, the lost home, a vanished mining town and abandoned airports, to the post-apocalyptic wastelands in literary fiction, the photographic and filmic surfaces where spectres materialise, and the body as a site for re-corporealising the disappeared and dead. In ruminating on the afteraffects of spectral spaces on human experience, the anthology importantly foregrounds the ethical and political imperative of engaging with ghosts and following their traces.

This work is a concise introduction to spectral theory of Hilbert space operators. Its emphasis is on recent aspects of theory and detailed proofs, with the primary goal of offering a modern introductory textbook for a first graduate course in the subject. The coverage of topics is thorough, as the book explores various delicate points and hidden features often left untreated. Spectral Theory of Operators on Hilbert Spaces is addressed to an interdisciplinary audience of graduate students in mathematics, statistics, economics, engineering, and physics. It will also be useful to working mathematicians using spectral theory of Hilbert space operators, as well as for scientists wishing to apply spectral theory to their field. ​

This book synthesizes Jacques Derrida’s hauntology and spectrality with affect theory, in order to create a rhetorical framework analyzing the felt absences and hauntings of written and oral texts. The book opens with a history of hauntology, spectrality, and affect theory and how each of those ideas have been applied. The book then moves into discussing the unique elements of the rhetorical framework known as the rhetorrectional situation. Three case studies taken from the Christian tradition, serve to demonstrate how spectral rhetoric works. The first is fictional, C.S. Lewis ’The Great Divorce. The second is non-fiction, Tim Jennings ’The God Shaped Brain. The final one is taken from homiletics, Bishop Michael Curry’s royal wedding 2018 sermon. After the case studies conclusion offers the reader a summary and ideas future applications for spectral rhetoric.

Small-radius tubular structures have attracted considerable attention in the last few years, and are frequently used in different areas such as Mathematical Physics, Spectral Geometry and Global Analysis. In this monograph, we analyse Laplace-like operators on thin tubular structures ("graph-like spaces''), and their natural limits on metric graphs. In particular, we explore norm resolvent convergence, convergence of the spectra and resonances. Since the underlying spaces in the thin radius limit change, and become singular in the limit, we develop new tools such as norm convergence of operators acting in different Hilbert spaces, an extension of the concept of boundary triples to partial differential operators, and an abstract definition of resonances via boundary triples. These tools are formulated in an abstract framework, independent of the original problem of graph-like spaces, so that they can be applied in many other situations where the spaces are perturbed.

North-Holland Series in Applied Mathematics and Mechanics, Volume 6: Introduction to Spectral Theory in Hilbert Space focuses on the mechanics, principles, and approaches involved in spectral theory in Hilbert space. The publication first elaborates on the concept and specific geometry of Hilbert space and bounded linear operators. Discussions focus on projection and adjoint operators, bilinear forms, bounded linear mappings, isomorphisms, orthogonal subspaces, base, subspaces, finite dimensional Euclidean space, and normed linear spaces. The text then takes a look at the general theory of linear operators and spectral analysis of compact linear operators, including spectral decomposition of a compact selfadjoint operator, weakly convergent sequences, spectrum of a compact linear operator, and eigenvalues of a linear operator. The manuscript ponders on the spectral analysis of bounded linear operators and unbounded selfadjoint operators. Topics include spectral decomposition of an unbounded selfadjoint operator and bounded normal operator, functions of a unitary operator, step functions of a bounded selfadjoint operator, polynomials in a bounded operator, and order relation for bounded selfadjoint operators. The publication is a valuable source of data for mathematicians and researchers interested in spectral theory in Hilbert space.

A groundbreaking contribution to number theory that unifies classical and modern results This book develops a new theory of p-adic modular forms on modular curves, extending Katz's classical theory to the supersingular locus. The main novelty is to move to infinite level and extend coefficients to period sheaves coming from relative p-adic Hodge theory. This makes it possible to trivialize the Hodge bundle on the infinite-level modular curve by a "canonical differential" that restricts to the Katz canonical differential on the ordinary Igusa tower. Daniel Kriz defines generalized p-adic modular forms as sections of relative period sheaves transforming under the Galois group of the modular curve by weight characters. He introduces the fundamental de Rham period, measuring the position of the Hodge filtration in relative de Rham cohomology. This period can be viewed as a counterpart to Scholze's Hodge-Tate period, and the two periods satisfy a Legendre-type relation. Using these periods, Kriz constructs splittings of the Hodge filtration on the infinite-level modular curve, defining p-adic Maass-Shimura operators that act on generalized p-adic modular forms as weight-raising operators. Through analysis of the p-adic properties of these Maass-Shimura operators, he constructs new p-adic L-functions interpolating central critical Rankin-Selberg L-values, giving analogues of the p-adic L-functions of Katz, Bertolini-Darmon-Prasanna, and Liu-Zhang-Zhang for imaginary quadratic fields in which p is inert or ramified. These p-adic L-functions yield new p-adic Waldspurger formulas at special values.