MG12 - Talk detail
 

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Abstract

Test of scalar-tensor theory from observations of gravitational-wave bursts with a network of interferometric detectors.

Testing relativistic gravity theories which are alternatives to general relativity (GR) using gravitational wave observations is important for fundamental physics and cosmology. Constraints on alternative gravity theories might provide a key to the solution of the mysteries of dark matter and dark energy. One plausible alternative is scalar-tensor (S-T) theory. Significant differences from GR include the existence of a scalar field which is connected with the gravity field with a coupling parameter and a resulting scalar gravitational wave. In this talk, focusing on the Brans-Dicke model as a scalar-tensor theory, we present how to extract a scalar gravitational wave signal using a network of world-wide interferometric detectors. We perform simulations to extract a scalar gravitational wave which has a comparable coupling parameter to the current upper limit by Cassini assuming supernovae occur in our Galaxy. In the simulation, we use simulated noise with enhanced-LIGO-VIRGO-GEO design sensitivity. We discuss new data analysis issues which have to be solved for the detection of scalar gravitational waves and also discuss the capability of advanced LIGO and LCGT.

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