| Can We Detect Brans-Dicke Scalar Gravitational Waves In Gravitational Collapse? (2007) | |||||||||||||
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| tional radiation directly using a km-scale laser interferometer such as LIGO 2 , VIRGO, GEO, and TAMA are progressing. These direct detections of gravitational waves will enable us to see strong gravitational phenomena such as coalescence of compact stars or black holes. By observing gravitational waves, we expect to extract many parameters of sources. Here, we examine an alternative information in waveform of gravitational waves; whether we can find some evidence for alternative theories of gravity instead of general relativity. Especially, we consider the Brans-Dicke (BD) theory 3 of gravity, which is the simplest and proto-type among all scalar-tensor theories of gravity. [We know the recent strictest bound 4 for BD theory is to the BD parameter !BD ? ΒΈ 500.] In BD theory, gravitational waves have three modes, i.e., a scalar mode, which we call a scalar gravitational wave (SGW), as well as | |||||||||||||
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