1998 (IPP)
Permanent URI for this collectionhttp://localhost:4000/handle/11007/2980
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Item Hierarchial search strategy for inspiraling compact binaries(2015-03-11) Dhurandhar, S.V.Item Radiation pressure induced instabilities in laser interferometric detectors of gravitational waves(2015-03-13) Pai, A.; Dhurandhar, S.V.; Hello, P.; Vinet, J.Y.The large scale interferometric gravitational wave detectors consist of Fabry-Perot cavities operating at very high powers ranging from tens of kW to MW. The high powers may result in several nonlinear effects which would affect the performance of the detector. In this paper, we investigate the effects of radiation pressure, which tend to displace the mirrors from their resonant position resulting in the detuning of the cavity. We observe a remarkable effect, namely, that the freely hanging mirrors gain energy continuously and swing with increasing amplitude. It is found that the 'time delay', that is, the time taken for the field to adjust to its instantaneous equilibrium value, when the mirrors are in motion, is responsible for this effect. This effect is likely to be important in the optimal functioning of the full-scale interferometers such as the VIRGO and LIGO.Item Search for gravitational waves from the millisecond pulsar PSR 0437-471(2015-03-11) Mohanty, S.D.; Heng, I.S.; Blair, D.G; Dhurandhar, S.V.; Tobar, M.; Ivanov, E.A search for gravitational waves from the millisecond pulsar PSR 0437-471has been initiated using the bar detector NIOBE which is located at the University of Western Australia. This search involves a very long coherent integration of the bar output which may stretch over a few years. We present a detailed report on the data analysis algorithm, called phase plane rotation,which will be used in this search. A discussion of the actual implementation of the algorithm is presented.