Heidelberg 1999 – wissenschaftliches Programm

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MP: Theoretische und Mathematische Grundlagen der Physik

MP 13: Gravitational radiation, strings and random matrices                                 (joint session with T and GR)

MP 13.1: Hauptvortrag

Dienstag, 16. März 1999, 10:00–10:50, CH1

Different approaches to the study of the gravitational radiation emitted by astrophysical sources — •Valeria Ferrari — Universitá di Roma “La Sapienza”, Ple. A. Moro 2, 00185 Roma, Italy

Compact stars and black holes are sources of gravitational waves in many phases of their life: at their birth, when gravitational collaps ends the evolution of a sufficiently massive star by an intense burst of radiation, or later, when compact bodies resolve around each other in binary systems, or encounter an occasional companion and coalease. In addition, if gravitational events of a given sort are frequent enough, the signals they produce superimpose and generate backgrounds of radiations. The properties of signals produced in individual and collective astrophysical events can be studied by using different approaches, that range from the direct integration of the fully non-linear Einstein equations (numerical relativity), to perturbative approaches (the theory of stellar pulsations) and approximate methods (post-newtonian or quadrupole formalism). In this lecture some of the main results obtained by using different approaches will be illustrated.