16 research outputs found

    Back reaction in the formation of a straight cosmic string

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    A simple model for the formation of a straight cosmic string, wiggly or unperturbed is considered. The gravitational field of such string is computed in the linear approximation. The vacuum expectation value of the stress tensor of a massless scalar quantum field coupled to the string gravitational field is computed to the one loop order. Finally, the back-reaction effect on the gravitational field of the string is obtained by solving perturbatively the semiclassical Einstein's equations.Comment: 29 pages, LaTeX, no figures. A postcript version can be obtained from anonymous ftp at ftp://ftp.ifae.es/preprint.f

    Organizational knowledge: Ethics and the importance of trust.

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    The aim of this paper is to grasp the ethical dilemmas that arise into organizational knowledge and the importance of trust for diminishing these dilemmas. Therefore, it focuses three key issues: knowledge management (concept; and, schools of thought); knowledge flowing models versus ethics (mental models; the Socialization, Externalization, Combination, Internalization (SECI) model; and, Fiske’s relational model); and finally, the importance of trust as a possible answer. Plus, this paper suggests that the previous models only focus knowledge as continuum process and the result of this process omits ethical and moral dilemmas (obligation to share, personal property, personal worth, autonomy, dignity, privacy, etc.). These ethical dilemmas clearly weaken a knowledge management project, and how trust is a reliable answer. The absence of empirical work should be considered a limitation of this paper; however, does not diminish the importance for this debate
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