20 research outputs found
Vacuum polarization effects on quasinormal modes in electrically charged black hole spacetimes
We investigate the influence of vacuum polarization of quantum massive fields
on the scalar sector of quasinormal modes in spherically symmetric black holes.
We consider the evolution of a massless scalar field on the spacetime
corresponding to a charged semiclassical black hole, consisting of the quantum
corrected geometry of a Reissner-Nordstr\"om black hole dressed by a quantum
massive scalar field in the large mass limit. Using a sixth order WKB approach
we find the shift in the quasinormal mode frequencies due to vacuum
polarization .Comment: 9 pages, 5 figures, typos added, references added and content change
The geodesic structure of the Schwarzschild Anti-de Sitter black hole
In the present work we found the geodesic structure of an AdS black hole. By
means of a detailed analyze of the corresponding effective potentials for
particles and photon, we found all the possible motions which are allowed by
the energy levels. Radial and non radial trajectories were exactly evaluated
for both geodesics. The founded orbits were plotted in order to have a direct
visualization of the allowed motions. We show that the geodesic structure of
this black hole presents new type of motions not allowed by the Schwarzschild
spacetime.Comment: 17 pages, 11 figure
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Organizational Discourse: Domains, Debates, and Directions
Interest in the analysis of organizational discourse has expanded rapidly over the last two decades. In this article, we reflect critically on organizational discourse analysis as an approach to the study of organizations and management, highlighting both its strengths and areas of challenge. We begin with an explanation of the nature of organizational discourse analysis and outline some of the more significant contributions made to date. We then discuss existing classifications of approaches to the study of organizational discourse and suggest that they fall into two main categories: classifications by level of analysis and classifications by type of method. We argue that both of these approaches are inherently problematic and present an alternative way to understand the varieties of approaches to the analysis of organizational discourse based on within domain and across domain characterizations. We conclude with a discussion of the challenges that remain in the development of organizational discourse as an area of study and point to some of the opportunities for important and unique contributions to our understanding of organizations and management that this family of methods brings. © 2012 Copyright Academy of Management