Heisenberg modules as function spaces

Let $\Delta$ be a closed, cocompact subgroup of $G \times \widehat{G}$, where $G$ is a second countable, locally compact abelian group. Using localization of Hilbert $C^*$-modules, we show that the Heisenberg module $\mathcal{E}_{\Delta}(G)$ over the twisted group $C^*$-algebra $C^*(\Delta,c)$ due to Rieffel can be continuously and densely embedded into the Hilbert space $L^2(G)$. This allows us to characterize a finite set of generators for $\mathcal{E}_{\Delta}(G)$ as exactly the generators of multi-window (continuous) Gabor frames over $\Delta$, a result which was previously known only for a dense subspace of $\mathcal{E}_{\Delta}(G)$. We show that $\mathcal{E}_{\Delta}(G)$ as a function space satisfies two properties that make it eligible for time-frequency analysis: Its elements satisfy the fundamental identity of Gabor analysis if $\Delta$ is a lattice, and their associated frame operators corresponding to $\Delta$ are bounded.Comment: 24 pages; several changes have been made to the presentation, while the content remains essentially unchanged; to appear in Journal of Fourier Analysis and Application

Time-frequency analysis on the adeles over the rationals

We show that the construction of Gabor frames in $L^{2}(\mathbb{R})$ with generators in $\mathbf{S}_{0}(\mathbb{R})$ and with respect to time-frequency shifts from a rectangular lattice $\alpha\mathbb{Z}\times\beta\mathbb{Z}$ is equivalent to the construction of certain Gabor frames for $L^{2}$ over the adeles over the rationals and the group $\mathbb{R}\times\mathbb{Q}_{p}$. Furthermore, we detail the connection between the construction of Gabor frames on the adeles and on $\mathbb{R}\times\mathbb{Q}_{p}$ with the construction of certain Heisenberg modules.Comment: minor revisions, added more references, added a Balian-Low type result in the form of Proposition 4.

\u3cem\u3eBataclanismo\u3c/em\u3e! Or, How Deco Bodies Transformed Postrevolutionary Mexico City

In the spring of 1925, Santa Anita\u27s Festival of Flowers seemed to follow its tranquil trend of previous years. The large displays of flowers, the selection of indias bonitas (as the contestants of beauty pageants organized in an attempt to stimulate indigenism were known) and the boat-rides on the Viga Canal, all communicated what residents of neighboring Mexico City had come to expect of the small pueblo in the Federal District since the Porfiriato: the respite of a peaceful pastoral, the link to a colorful past, and the promise that mexicanidad was alive and well in the campo. Unfortunately, wrote Manuel Rámirez Cárdenas of El Globo, the modern newspaper, the next day, this idyllic tradition was rudely interrupted by a group of audacious, scantily clad women. The culprits were actresses of Mexico City\u27s Lírico theater, who walked around Santa Anita\u27s streets in picaresque clothing —stage outfits that left little to the imagination, particularly in broad daylight—and upset visitors and campesinos alike. According to Cárdenas, abuelitas and mamás were shocked by the display, averting their eyes from the female spectacle in fear of el pecado mortal. Thankfully, for the mothers and grandmothers in the audience, the festival continued in predictable fashion after the initial uproar. Organizers continued with the traditional dances, and judges selected an india bonita from a pool of young, decente mestizo girls to represent the pueblo and the festival. Unbeknownst to the residents of rural Santa Anita, the daring actresses of El Lírico were part of a new phenomenon that had swept through Mexico City like wildfire, turned the entertainment world upside down, and pushed many to reconsider what constituted female beauty, decency, and lo mexicano. A few months earlier, on February 12th, a grand variety spectacle named Voilá Paris: La Ba-ta-clán premiered in Teatro Iris and instantly sent shock waves throughout the Mexican entertainment world and the larger metropolis. The show featured seminude and nude French actresses, who performed dances and acts that appeared to be a mix of classical ballet, Ziegfeld Follies chorus lines, and tableaux vivants. Within weeks, Mexican copycat productions capitalized on the enormous success of the show, triggering a new entertainment phenomenon named after the original production: Bataclanismo. It also launched a new kind of female star, the bataclana, who came to represent the erotic, and more dangerous, attributes of the flapper for Mexican audiences, and whose body became the site of contested and divergent notions of modernity. In this article, I explore bataclanismo as a normative discourse that reached far beyond the theater into the practice of everyday life. I do so to gauge the transition of changing ideals of femininity in Mexico from 1925 to 1935, and the influence these changes had on the development of urban space. Drawing on Elizabeth Grosz\u27 and Doreen Massey\u27s insights that place and gender are mutually constitutive, this article examines the articulation between the embodied city and changing gender norms in the wake of both the Mexican revolution and the advent of twentieth-century global capital. Analyzing these relationships from Judith Butler\u27s perspective of gender performance, especially as read through bodies, I argue that a new transnational aesthetic of feminine embodiment celebrated in bataclanismo influenced a distinct urban modernity and sociability in Mexico City. This new ideal female physique that stressed length, height, and androgyny—what I term a Deco body—helped to reconfigure Mexico City in terms of gender, space and race. It ushered in new gender ideals, helped visualize urban modernity, and bridged the gap between two divergent discourses that accompanied revolutionary reform, indigenismo and mestizaje, paving the way for a mestizo modernity

Accounting for Contemporary Antisemitism: A Four-Dimensional Framework and a New Dataset

Existing scholarship on contemporary antisemitism tends to sacrifice breadth for depth, typically focusing on a specific dimension of the phenomenon or a single national or ideological context. This nearsightedness threatens to limit our understanding of current antisemitism because separate parts of a complex picture are studied in isolation, and because crucial questions about temporal and cross-national variation remain understudied. To help remedy this situation, this article introduces a more comprehensive conceptual and empirical framework along with a new dataset intended to encourage the study of antisemitism as a multidimensional, cross-national, and dynamic phenomenon. The framework conceptualizes antisemitism in four core dimensions—attitudes, incidents, cultural imagery, and Jews' exposure—and specifies relevant variables and indicators, thus facilitating future research and data collection efforts. To supplement the framework, the article introduces a new dataset (DIMA—Dimensions of Antisemitism) featuring publicly available data covering three of the four dimensions: attitudes, incidents, and exposure. Based on patterns emerging from these data, hypotheses for further study are suggested. These contributions are intended to prepare the ground for a new and theoretically more ambitious research agenda in the field of contemporary antisemitism research.Accounting for Contemporary Antisemitism: A Four-Dimensional Framework and a New DatasetacceptedVersio

Does the Norwegian Stock Market Overreact?

Abstract Decades of behavioral finance research show that investors often let fresh news about recent performance bias their judgement, causing investors to overreact. This thesis tests whether such overreaction is visible on the Norwegian stock market, which directly contradicts the weak form of Efficient Market Hypothesis. This thesis investigates whether stock prices on the Oslo Stock exchange is consistent with the overreaction pattern first documented for U.S. equities by De Bondt and Thaler (1985). The study uses two formation periods from 2013-2015 and 2019-2021, and two test periods from 2016-2018 and 2022-2024. For each formation period, all ordinary norwegian stocks on Oslo Børs with at least three years of trading history was ranked by its return relative to the OSEBX benchmark. The top ten percent of this ranking formed the winner portfolios, while the bottom ten percent formed the loser portfolios. Once these portfolios were defined, the following three year test periods measured how past winners and losers performed over time. In both test periods, the loser portfolios significantly outperformed the winner portfolios. The results indicate overreaction in the norwegian stock market. Keywords: Behavioral finance; EMH; Anomalies; Overreaction; Norwegian Stock market; Oslo BørsAbstract Decades of behavioral finance research show that investors often let fresh news about recent performance bias their judgement, causing investors to overreact. This thesis tests whether such overreaction is visible on the Norwegian stock market, which directly contradicts the weak form of Efficient Market Hypothesis. This thesis investigates whether stock prices on the Oslo Stock exchange is consistent with the overreaction pattern first documented for U.S. equities by De Bondt and Thaler (1985). The study uses two formation periods from 2013-2015 and 2019-2021, and two test periods from 2016-2018 and 2022-2024. For each formation period, all ordinary norwegian stocks on Oslo Børs with at least three years of trading history was ranked by its return relative to the OSEBX benchmark. The top ten percent of this ranking formed the winner portfolios, while the bottom ten percent formed the loser portfolios. Once these portfolios were defined, the following three year test periods measured how past winners and losers performed over time. In both test periods, the loser portfolios significantly outperformed the winner portfolios. The results indicate overreaction in the norwegian stock market. Keywords: Behavioral finance; EMH; Anomalies; Overreaction; Norwegian Stock market; Oslo Bør

The Paris Lyric songs of Ned Rorem

Ned Rorem is a contemporary 7-\merican composer. Despite the increasing amount of music he has contributed to the music scene, he is relatively unknown. At the time this paper is being written, information about his life and his work is scattered and limited. One purpose of this paper is to consolidate, clarify and correct pertinent personal data about Mr. Rorem. Much of this data has been collected from recent writings by the composer and personal correspondence between Mr. Rorem and this writer. A second aim of this paper will be to clarify Rorem\u27s philosophy concerning the role of music in the life of the layman and the artist. Contemporary music is following many different and conflicting paths. Of the diverse paths available to the contemporary composer, Rorem has deliberately chosen the path which is most closely associated with those composers who are eclectic in their selection of material. This is in contrast to those composers who invent new instruments with which to create music. song composer must be conscious of text. Contemporary composers are faced with the difficult task of finding contemporary poems which are compatible with the style of song. An aim of this paper will be to examine the texts of Rorem\u27s songs. By so doing it will be possible to determine how he has solved this particular problem. Mr. Rorem has created many fresh, beautiful songs. The final aim of this paper is to examine some of his songs and to analyze some cf the song writing techniques employed by him. This paper will deal primarily with those songs which he composed between the years 1948 and 1958. Mr. Rorem lived in France and Morocco during these years. As has been stated, it is an aim of this paper to examine some of the songs composed by Rorem during his French years. By so doing it is hoped that we can clarify the means whereby he has combined traditional and contemporary techniques in creating his songs

Facing antisemitism in Europe: individual and country-level predictors of Jews’ victimization and fear across twelve countries

publishedVersio

Accounting for Contemporary Antisemitism: A Four-Dimensional Framework and a New Dataset

Existing scholarship on contemporary antisemitism tends to sacrifice breadth for depth, typically focusing on a specific dimension of the phenomenon or a single national or ideological context. This myopia threatens to limit our understanding of current antisemitism because separate parts of a complex picture are studied in isolation, and because crucial questions about temporal and cross-national variation remain understudied. To help remedy this situation, this article introduces a more comprehensive conceptual and empirical framework along with a new dataset intended to encourage the study of antisemitism as a multidimensional, cross-national, and dynamic phenomenon. The framework provides a model for studying antisemitism in four core dimensions—attitudes, incidents, cultural imagery, and Jews’ exposure—and specifies relevant variables and indicators, thus facilitating future research and data collection efforts. To supplement the framework, the article introduces a new dataset (DIMA—Dimensions of Antisemitism) featuring publicly available data covering three of the four dimensions: attitudes, incidents, and exposure. Based on patterns emerging from these data, hypotheses for further study are suggested. These contributions are intended to prepare the ground for a new and theoretically more ambitious research agenda in the field of contemporary antisemitism research.Accounting for Contemporary Antisemitism: A Four-Dimensional Framework and a New DatasetacceptedVersionpublishedVersio

Does Size Matter? Empirical Evidence for Product Specification Rebound Effects

Masteroppgave(MSc) in Master of Science in Business, Marketing - Handelshøyskolen BI, 2019The current study explores a new field with the concept of rebound effects that have been receiving scant attention – namely, product specification rebound effects which occur when consumers choose larger or more powerful specifications of the product as a response to improvements in energy efficiency. Although there is a theoretical foundation for their existence, almost no empirical study has previously focused on product specification rebound effects. Hence, the study aimed to empirically confirm whether efficiency improvements lead to product specification rebound effects, as well as to explore different factors that may affect their magnitude. Our findings support the existence of product specification rebound effects and show that a significant share of the anticipated energy efficiency gains can be lost due to product specification rebound effects. The study also finds that greater efficiency improvements tend to lead to greater product specification rebound effects. As energy efficiency is seen as one of the most fundamental approaches to tackle climate change, this raises a question over the effectiveness of energy efficiency measures as a way of tackling climate change. The study has significant implications for both policy makers and manufacturers, as the introduction of more energy efficient technologies results in consumers making product upgrades. From the policy making perspective, this means that expected energy gains from efficiency measures will be vastly offset by product specification rebound effects. As a result, there will not be any significant reduction in energy consumption, which is critical for tackling climate change. At the same time, from the business perspective, marketing energy efficiency seems to be a potentially successful strategy to induce product upselling. By introducing more energy efficient technologies, manufacturers can sell bigger and more powerful specifications of the product, which are usually more profitable

A dynamical approach to non-uniform density theorems for coherent systems

We introduce a notion of covolume for point sets in locally compact groups that simultaneously generalizes the covolume of a lattice and the reciprocal of the Beurling density for amenable, unimodular groups. This notion of covolume arises naturally from the transverse measure theory of the associated hull dynamical system of a point set. Using groupoid techniques, we prove a density theorem for coherent frames over unimodular groups using this new notion of covolume that generalizes both the previous theorems for uniform sampling in general unimodular groups and those for non-uniform sampling in compactly generated groups of polynomial growth. This density theorem also covers important new examples, in particular model sets arising from cut-and-project schemes.Comment: 30 page