LIGO Document T2300203-v4

Understanding Combined Results From Multiple GW Searches Using Information Theory

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LIGO-T2300203-v4
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T - Technical notes
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Abstract:
Determining whether a gravitational wave (GW) signal is of astrophysical origin or is caused by terrestrial noise still presents a challenge to the GW community. Current searches estimate the significance of events by calculating the false alarm rate (FAR) and p_astro, but these results are limited to a single search pipeline. In this work, we suggest a method of combining GW information by calculating harmonic mean FARs for different groups of GW searches and using them as the basis for calculating a joint p_astro. Using this approach, we compare the effectiveness of different combinations of searches, revisit the significance of previously detected events, and investigate the correlations between pipelines using the language of information theory.
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Keywords:
SURF23

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