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Gravitational-wave (GW) searches are impaired by the presence of transient sources of noise that can masquerade as a GW signal. This is particularly a burden when these events have larger amplitudes and hence generate an increase in the background for the loudest triggers. Requiring a coincidence between the output of the Virgo and LIGO detectors does not completely eliminate their effect. It is therefore necessary to suppress them in the Virgo GW channel trigger list. Many of these events are due to sources of noise intrinsic to the detector, or environmental disturbances. We here show that many of these sources of noise have been identified, looking at the Virgo GW and auxiliary channels. Data quality vetoes have been defined specifically for the GW burst and inspiral searches, and applied to Virgo data in the joint LIGO/Virgo analys...
In the following years several giant laser interferometers dedicated to gravitational wave detection will be fully operational near their design sensitivity. Analysis combining all the detectors will improved sky coverage and allow meaningful network analysis, providing source location indications. We focus on plausible astrophysical sources and the informations that could be extracted from gravitational wave signal. Observation of gravitational waves would give exclusive insights on source details, from constraints on the equation of state to source dynamics of compact objects. Richer analysis could be expected in case of multi-messenger observations. These have been considered for supernovae, but should be investigated further, including for other phenomena.
Ground based gravitational detectors will soon reach a sensitivity such that a first direct direction is plausible. I will briefly recall the basics of gravitationalfirst direct direction is plausible. I will briefly recall the basics of gravitational wave physics and the main sources for terrestrial detectors. Then I will then give a summary of the main observational results obtained so far and will discuss the perspectives for the next years.
Recent works have shown that it is possible to devise a clear thesis of universal determinism. Two such theses are formulated. Apparently the motivations for universal determinism have been: (1) to account for the explanatory power of scientific laws, (2) to support the principle of sufficient reason, and (3) to provide a methodological criterion for scientific progress. Universal determinism is, however, unsatisfactory in view of its apparent conflict with important physical theories such as quantum mechanics. The question then arises whether there is a weaker thesis, compatible with contemporary physical theories, that satisfies the motivation for universal determinism. A thesis of relative determination that satisfies these conditions is proposed.
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