30 research outputs found
Back reaction in the formation of a straight cosmic string
Get PDFA 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
Os efeitos do abandono para o desenvolvimento psicológico de bebês e a maternagem como fator de proteção
Full text linkFactores de riesgo para el desarrollo psicomotor en lactantes nacidos en óptimas condiciones biológicas
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Enzyme-linked immunosorbent assay for the detection of serum antibody to outer membrane proteins of Treponema pallidum.
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Help seeking and barriers to utilisation of medical and health social work services among ageing immigrants to Israel from the former Soviet Union
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