A morphology-independent data analysis method for detecting and characterizing gravitational wave echoes
| Autor: | Tsang, Ka Wa, Rollier, Michiel, Ghosh, Archisman, Samajdar, Anuradha, Agathos, Michalis, Chatziioannou, Katerina, Cardoso, Vitor, Khanna, Gaurav, Broeck, Chris Van Den |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 98, 024023 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.98.024023 |
| Popis: | The ability to directly detect gravitational waves has enabled us to empirically probe the nature of ultra-compact relativistic objects. Several alternatives to the black holes of classical general relativity have been proposed which do not have a horizon, in which case a newly formed object (e.g. as a result of binary merger) may emit echoes: bursts of gravitational radiation with varying amplitude and duration, but arriving at regular time intervals. Unlike in previous template-based approaches, we present a morphology-independent search method to find echoes in the data from gravitational wave detectors, based on a decomposition of the signal in terms of generalized wavelets consisting of multiple sine-Gaussians. The ability of the method to discriminate between echoes and instrumental noise is assessed by inserting into the noise two different signals: a train of sine-Gaussians, and an echoing signal from an extreme mass-ratio inspiral of a particle into a Schwarzschild vacuum spacetime, with reflective boundary conditions close to the horizon. We find that both types of signals are detectable for plausible signal-to-noise ratios in existing detectors and their near-future upgrades. Finally, we show how the algorithm can provide a characterization of the echoes in terms of the time between successive bursts, and damping and widening from one echo to the next. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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