SU(2) WZW D-branes and quantized worldvolume U(1) flux on S^2

We discuss possible D-brane configurations on SU(2) group manifolds in the sigma model approach. When we turn the boundary conditions of the spacetime fields into the boundary gluing conditions of chiral currents, we find that for all D-branes except the spherical D2-branes, the gluing matrices R^a_{b} depend on the fields, so the chiral Kac-Moody symmetry is broken, but conformal symmetry is maintained. Matching the spherical D2-branes derived from the sigma model with those from the boundary state approach we obtain a U(1) field strength that is consistent with flux quantization.Comment: 10 pages, Latex, several corrections (the previous version was not approved by the first two authors

Corporate social capital, market orientation, organizational learning and service innovation performance: an empirical survey in the Pearl river delta of China

Purpose: Service innovation performance (SIP) is an important driver of growth and wealth of service firms in wide range of industries. Yet, few research studies have been done to explore the influencing factors. The purpose of this study intends to identify the impacts of corporate social capital, market orientation and organizational learning on service innovation in the Pearl River Delta of China. Design/methodology/approach: The paper mainly adopted the empirical research. A Structure Equation Model containing an intermediary variable was established to explore the relationships of SIP. Findings and Originality/value: The main findings of the research support some of the propositions: (1) Both corporate social capital, market orientation and organizational learning have distinct positive impact on service innovation performance; (2) Corporate social capital, market orientation has a positive effect on organizational learning respectively, and (3) organizational learning plays a mediating role between the corporate social capital, market orientation and service innovation performance. Research limitations/implications: The research object of this paper has been restricted to the enterprises in Pearl River Delta of China. By contrast, variables and theories all come from western research, which was not adequate in explaining some results in the context of China. Given the limited theoretical and empirical research to service innovation, future research studies might widen their examinations to include other potential factors. Practical implications: This study has significant implications to enterprises. The results of this study suggest that enterprises should establish the social networks accommodated by the development of organization. In addition, more attention should be paid to focus on market orientation to enhance the ability to respond to changes in the market environment. It’s particularly necessary to strengthen organizational learning to improve the ability of information. Originality/value: The insights from this paper can help service managers to better understand the relationship among corporate social capital, market orientation, organizational learning and service innovation performance in the context of China’s economic transformation, as well as provide some useful guidance for the service sector’s innovation activities.Peer Reviewe