No description available.

We consider a simple model for invisible neutrino decay as a sub-leading effect in the standard three-flavor neutrino oscillation framework, and use the Cayley–Hamilton formalism to obtain a full set of neutrino oscillation probabilities in matter. These are given as analytical series expansions in the small parameters α ∼ O(λ^2) and s_13 ∼ O(λ), where λ ≡ 0.2 is a “book-keeping parameter” denoting the order of the expansion. We produce explicit formulas for P_eµ, P_eτ , P_µµ, P_µτ , and P_ττ to order O(λ^3), and for P_ee to order O(λ^2), all having first corrections of order O(λ^4). Moreover, we also present vacuum limits of our expressions, as well as discuss the effect of decay on unitarity. We show that all rows in the unitarity table have corrections of order O(λ^2), with the second and third rows having additional corrections of order O(1). In the limit of no decay, unitarity is restored, and we furthermore recover known results for all probabilities. / Vi betraktar en enkel modell för osynligt neutrinosönderfall som en icke-ledande effekt inom det vedertagna ramverket för oscillationer med tre neutrinosmaker och använder Cayley–Hamilton-formalismen för att erhålla en fullständig uppsättning av sannolikheter för neutrinooscillationer i materia. Dessa ges som analytiska serieutvecklingar i de små parametrarna α ∼ O(λ^2) och s_13 ∼ O(λ), där λ ≡ 0.2 är en gemensam “bokföringsparameter” som anger serieutvecklingens ordning. Vi tar fram explicita uttryck för P_eµ, P_eτ , P_µµ, P_µτ och P_ττ till ordning O(λ^3) och för P_ee till ordning O(λ^2), med första korrigeringar för alla sannolikheterna till ordning O(λ^4). Därutöver presenterar vi gränsvärden för våra uttryck i vakuum samt diskuterar sönderfallets inverkan på unitaritet. Vi finner att alla rader i unitaritetstabellen har korrigeringar till ordning O(λ^2) och därtill korrigeringar till ordning O(1) för den andra och tredje raden. I avsaknad av sönderfall återfås unitaritet och vi reproducerar dessutom kända resultatför alla sannolikheter.

We derive the regularised evolution equations for the parton distribution functions that include tensorgluons.

No description available.

No description available.

Im vorliegenden Beitrag „In der Börse, am Hain und im Museum. Friktionen Urbaner Praxis im Ausstellen von Stadtgeschichte“ wird anhand künstlerisch-kuratorischer Kooperationen mit dem Stadtgeschichtlichen Museum Leipzig beschrieben, inwiefern auch museale Institutionen Räume Urbaner Praxis darstellen und maßgeblich verantwortlich dafür sind, wie städtischer Raum gelesen und gestaltet wird. Als öffentliche Institutionen haben Museen Zugriff auf Räume im Sinne einer Dynamisierung in der Zeit und „verwalten“ gleichzeitig mit den Archiven und Sammlungen deren Zugänglichkeit und das Wissen über deren bisherige Vorstrukturierung, Besetzung und Prägung. Anhand zweier Beispiele, einer performativen Intervention in der Alten Handelsbörse Leipzig und einer künstlerischen Auseinandersetzung mit dem Richard-Wagner-Hain, wird die Verschränkung von Historie und Gegenwart städtischer Räume mit aktuellen Fragen einer demokratischen Gesellschaft beschrieben.

In this doctoral thesis, we theoretically investigate the propagation of sound waves in dilute Bose gases, in both the collisionless and hydrodynamic regimes. The study of sound wave is a topic of high relevance for the understanding of dynamical properties of any fluid, classical or quantum, and further provides insightful information about the equation of state of the system. In our work, we focus in particular on the two-dimensional (2D) Bose gas, in which the sound wave is predicted to give useful information about the nature of the superfluid phase transition. Recently, experimental measurement of sound wave in a uniform 2D Bose gas has become available, and we show that the measured data are quantitatively well explained by our collisionless theory. Finally, we study the mixtures of weakly interacting Bose gases, by developing a beyond mean-field theory, which includes the effects of thermal and quantum fluctuations in both the density and spin channels. Our new theory allows for the investigation of sound dynamics, as well as the fundamental problem of phase- separation.

Yes / The world is experiencing an explosion in demand for ultra-high data rates with far greater expectations in the next few years. These expectations, given the bandwidth-demanding applications such as augmented and virtual reality and other beyond-5G applications, motivate the exploration of higher-frequency communication in the terahertz (THz) bands. However, THz communication is faced with many technical challenges, primarily due to the high susceptibility to blockages that limit its applications. Here, reconfigurable intelligent surfaces (RIS) provide alternative paths to circumvent such blockage effects and ensure reliable, spectral, and energy-efficient communication, thus advancing the THz-RIS technology concept. However, the ambitious targets of ubiquitous and global connectivity can only be satisfied by many technologies extending to multiple domains, from terrestrial networks to non-terrestrial network (NTN) domains. The use of airborne and spaceborne networks is considered a potential solution for addressing these challenges due to their dynamism, coverage, and ability to leverage their altitude for achieving line-of-sight communication for enhanced signal quality and network performance. Therefore, unmanned aerial vehicles, high-altitude platform stations, and satellites are poised to use flying THz-based RISs to improve air-to-ground and space-to-ground communication reliability while exploiting novel RIS architectures, techniques and enablers to address the issues regarding the propagation conditions, hardware limitations, network complexity and system performance. The aim in this paper is to present the discussion and a survey on the technical advances on THz-RIS NTNs, in addition to outlining potential applications, architectural variants, influencing properties, as well as its prospects, associated challenges, open issues and future directions towards high-data rate THz-RIS NTN communication for 6G and beyond. / This work was supported in part by the Universiti Kebangsaan Malaysia through Dana Impak Perdana 2.0 under Grant DIP-2022-020; and in part by the Engineering and Physical Sciences Research Council [grant number EP/Z001544/1] through the UK Research and Innovation (UKRI)-funded Marie Skłodowska-Curie Actions (MSCA) Postdoctoral Fellowship

Bakgrund och problem: Det har riktats kritik mot den traditionella ekonomistyrningen vilket har gjort att moderna styrmetoder och verktyg växt fram för att komplettera ekonomistyrningen. De faktorer som tvingat fram den moderna styrningen går även att se i musikbranschen. Detta, tillsammans med att ekonomistyrning i musikbranschen generellt sett är outforskat, gör att det blir intressant att undersöka hur skivbolag i musikbranschen använder sig av en traditionell ekonomistyrning eller modern verksamhetsstyrning. Syfte: Syftet med denna uppsats är att genom att undersöka två skivbolags ekonomistyrning kartlägga hur ekonomistyrningen karaktäriseras utifrån traditionell ekonomistyrning och modern verksamhetsstyrning. Metod: Metoden som använts vid denna studie är kvalitativ. Vi har genom fallstudier hos två skivbolag undersökt och skapat oss en förståelse av ekonomistyrningen i bolagen med hjälp av semi-strukturerade intervjuer och kompletterande frågor via mail.   Slutsats: Det går att se att skivbolagen övergått delvis till en modern verksamhetsstyrning men att det alltså finns en blandning mellan användandet av traditionella och moderna styrmetoder och verktyg. / Background and problem: Criticism has been raised towards the traditional management control which pushed forward modern management methods and tools to complement management accounting. The factors that pushed out this modern management control are possible to see in the music industry aswell. This, together with the fact that management control in the music industry has a research gap, makes it interesting to examine how record labels in the swedish music industry are using traditional or modern management control. Purpose: The purpose of this thesis is to through the examination of two record labels create an understanding of how the management control is characterized through traditional or modern management control. Method: The method used in this study is qualitative. We have through a multiple-case study at two record labels examined and created an understanding of the management control in the companies with the help of semi-structured interviews and complementary questions through mail. Conclusion: It is possible to see that the record labels has partly moved to modern management control but also that you can see a mix between the usage of traditional and modern control methods and tools.

This research was undertaken to determine factors causing career indecision of schoolleavers in Kwandebele. Literature study indicates that factors such as interest, sex, dependency, vocational immaturity, the economy and politics have a direct influence on career indecision. Literature study further indicates that parties involved in career decision-making also contribute to career indecision. 424 Kwandebele school leavers answered questionnaires. The schoolleavers were requested to indicate the importance and contributions of five categories, namely personal aspects, family, school, guidance teacher and society to his career choice making process. Most of the personal aspects were regarded as important and also the other four categories showed a significant difference between school leavers who have made a choice and those that have not made a choice. This research could not cover the implication of career education at all levels of the child, recommendations for future research have been made. / Psychology of Education / M. Ed. (Psychology of Education)