How to overcome limitations of analytic solutions when determining the direction of a gravitational wave using experimental data: an example with the Schenberg detector

11th Edoardo Amaldi Conference on Gravitational Waves

Costa, C.F.S.^1 ; Magalhaes, N.S.^2

University of Florida, Department of Physics 2001 Museum Road, Gainesville

FL

32611-8440, United States^1

Federal University of Sao Paulo, Department of Exact and Earth Sciences, Rua Sao Nicolau 120, Diadema, SP

09913-030, Brazil^2

关键词: Analytic solution;    Computational power;    Gravitational wave detectors;    GW detectors;    Mathematical procedures;    Oscillating modes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/716/1/012019/pdf
DOI  :  10.1088/1742-6596/716/1/012019

来源: IOP

【 摘 要 】

It has been commonly assumed that analytic solutions can efficiently provide the direction of a gravitational wave (GW) once sufficient data is available from gravitational wave detectors. Nevertheless, we identified that such analytic solutions (based on the GW matrix reconstruction) present unforeseen theoretical and practical limitations (indeterminacies) and that for certain incoming directions they are unable to recover the latter. We present here important indeterminacy cases as well as a mathematical procedure that reduces such indeterminacies. Also, we developed a method that requires the least computational power to retrieve GW directions and which can be applied to any system of detectors able to reconstruct the GW matrix. As a test for the method, we used simulated data of the spherical, resonant- mass GW detector Schenberg, which involves five oscillating modes and six transducer readouts. The results show that this method canceled indeterminacies out satisfactorily.