Quest for Stochastic Gravitational-Wave Background and the anisotropies

Auditorium Marcel Vivargent (LAPP)

Auditorium Marcel Vivargent


Francesco Costanza (Centre National de la Recherche Scientifique (FR)), Laura Zambelli (LAPP)

SURESH Jishnu <>
Centre for Cosmology, Particle Physics and Phenomenology - CP3, Louvain (Belgium)

As of today, the Advanced LIGO and Virgo gravitational-wave (GW) detectors have cataloged nearly 100 GW detections from various compact object mergers. These discoveries began the endeavors to search for other kinds of GW sources. Among these, the Stochastic Gravitational-Wave Background (SGWB), because of the superposition of individually undetectable cosmological and/or astrophysical sources, is one of the potential sources to observe with the network of ground-based GW observatories in the coming years. A cosmologically produced SGWB would carry unique signatures from the earliest epochs in the evolution of the Universe. Likewise, an astrophysical background would provide information about the astrophysical sources that generated it. To a first approximation, the SGWB is assumed to be isotropic; one could determine its statistical properties by observing any part of the sky. However, these backgrounds can be anisotropic as well. We have developed techniques based on data folding to search for such anisotropies in the SGWB. With these techniques, we could perform an extremely efficient SGWB search in all directions and frequencies. This led to the creation of the first atlas of SGWB. In this talk, I will explain how one can map the SGWB anisotropy and the new directions one can explore with these tools.

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