11,217 research outputs found
Higher U(1)-gerbe connections in geometric prequantization
We promote geometric prequantization to higher geometry (higher stacks),
where a prequantization is given by a higher principal connection (a higher
gerbe with connection). We show fairly generally how there is canonically a
tower of higher gauge groupoids and Courant groupoids assigned to a higher
prequantization, and establish the corresponding Atiyah sequence as an
integrated Kostant-Souriau infinity-group extension of higher Hamiltonian
symplectomorphisms by higher quantomorphisms. We also exhibit the
infinity-group cocycle which classifies this extension and discuss how its
restrictions along Hamiltonian infinity-actions yield higher Heisenberg
cocycles. In the special case of higher differential geometry over smooth
manifolds we find the L-infinity-algebra extension of Hamiltonian vector fields
-- which is the higher Poisson bracket of local observables -- and show that it
is equivalent to the construction proposed by the second author in n-plectic
geometry. Finally we indicate a list of examples of applications of higher
prequantization in the extended geometric quantization of local quantum field
theories and specifically in string geometry.Comment: Title changed. Exposition revised. 55 page
Integrated Support for Handoff Management and Context-Awareness in Heterogeneous Wireless Networks
The overwhelming success of mobile devices and wireless
communications is stressing the need for the development of
mobility-aware services. Device mobility requires services
adapting their behavior to sudden context changes and being
aware of handoffs, which introduce unpredictable delays and
intermittent discontinuities. Heterogeneity of wireless
technologies (Wi-Fi, Bluetooth, 3G) complicates the situation,
since a different treatment of context-awareness and handoffs is
required for each solution. This paper presents a middleware
architecture designed to ease mobility-aware service
development. The architecture hides technology-specific
mechanisms and offers a set of facilities for context awareness
and handoff management. The architecture prototype works with
Bluetooth and Wi-Fi, which today represent two of the most
widespread wireless technologies. In addition, the paper discusses
motivations and design details in the challenging context of
mobile multimedia streaming applications
Resistance to frost and tuber soft rot in near-pentaploid Solanum tuberosum - S. commersonii hybrids
The objectives of the present study were to evaluate the tolerance to low temperatures and tuber soft rot in sexual near-pentaploid hybrids between incongruent 2x (1EBN) Solanum commersonii (CMM) and 4x (4EBN) S. tuberosum (TBR). For freezing resistance, killing temperatures both under non-acclimated and un- der acclimated conditions were determined using the ion leakage procedure. Values for the hybrids were dis- tributed between the wild and cultivated parental values. Some hybrids displayed an acclimation capacity close to 2.5°C, typical of hardy species. Artificial inoculation of tubers with Pectobacterium carotovorum ssp. carotovorum (formerly Erwinia carotovora ssp. carotovora) provided evidence of variability in disease response. Highly resistant hybrids were identified. After conventional phenotypic selection, wild genome content was estimated based on the presence of CMM-specific AFLP fragments. Seven primer combinations were used (Eco-AGG/Mse-CAA; Eco-ACC/Mse-CAT; Eco-ACT/Mse-CAC; Eco-ACT/Mse-CAG; Eco- ACT/Mse-CAA; Eco-ACT/Mse-CAT; Eco-AGG/Mse-CAG). The percentages of CMM-specific AFLPs ranged from 4.3% to 56.7%, with an average value of 28.1%. AFLP analysis was employed for the selection of the hybrids to be used for further breeding objectives
Early music influences in Paul Hindemith\u27s Compositions for the Viola
It is widely recognized that several of Paul Hindemith’s compositions display a significant use of early music forms and techniques. Yet, the scholarly literature in English focusing specifically on the influence of early music on Hindemith’s works for the viola is limited. Thus, through a discussion of selected works for solo viola and viola and orchestra, with a concentration on the two finales of the solo viola sonatas op. 11, no. 5, and op. 31, no. 4, the viola concerto Der Schwanendreher, and the Trauermusik for viola and strings, this document investigates the impact of early music on Hindemith’s compositional output for the viola. The findings of this research reveal that the study and practice of early music had a crucial influence on Hindemith’s compositional output, specifically illustrated through the use of early music techniques including fugues, ostinatos, chorale settings, canons, theme and variations, cantus firmus-like melodies, and the borrowing of old folksongs and chorales. Scholars should not exclude the possibility that early music influence extends beyond the examples presented in this thesis
Asymptotic Expansion for the Wave Function in a one-dimensional Model of Inelastic Interaction
We consider a two-body quantum system in dimension one composed by a test
particle interacting with an harmonic oscillator placed at the position .
At time zero the test particle is concentrated around the position with
average velocity while the oscillator is in its ground state. In a
suitable scaling limit, corresponding for the test particle to a semi-classical
regime with small energy exchange with the oscillator, we give a complete
asymptotic expansion of the wave function of the system in both cases
and .Comment: 23 page
- …