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Stochastic search in data enriched in coalescing binary triggers from the Virgo and LIGO gravitational wave detectors

Since 2016 and the first detection of gravitational waves announcement by the Virgo and LIGO collaborations, many other detections produced by compact objects coalescences were made. Most of them come from the coalescence of two black holes but at least one, detected in august 2017, was produced by two coalescing neutron stars. The third observation period of the LIGO-Virgo detectors ("run" O3) started in April 2019 and should end in May 2020. This period is marked by weekly detections of black hole coalescences and by some coalescence candidates including at least a neutron star, which could emit electromagnetic radiation.

In parallel to the coalescence signals, the Virgo and LIGO collaborations search for, among other things, stochastic signals coming from the superposition of all the gravitational waves produced by individually undetectable sources. This search has not been successful yet. One way to improve the stochastic search algorithms would be to combine the information present in the many binary coalescence signals which amplitude does not exceed the detection threshold to inform those algorithms.

The internship goal is to determine whether the selection of some data segments enriched with coalescence signals improves the perspective of gravitational wave stochastic signal detection.

o Level : Master 2 internship, can be followed by a PhD

o Date of the internship : spring 2020

o Supervisor : Damir Buskulic

o Phone : 04 50 09 55 22

o e-mail : buskulic@lapp.in2p3.fr

o Team members : D. Buskulic, R. Flaminio, R. Gouaty, F. Marion, T. Regimbau, L. Rolland, E. Tournefier, D. Verkindt, M. Was

Detailed description :