Dr Walter Del Pozzo (Universitá di Pisa)
Gravitational waves from the coalescence of compact binary systems carry a wealth of information about the merging objects, the remnant object as well as their interaction with space-time. During the coalescence of extremely compact objects such as binary black holes, the typical curvature and velocity at play are such that, from the observation of the gravitational wave signal, we can access...
M. Jahed Abedi (Sharif University of Technology)
In classical General Relativity (GR), an observer falling into an astrophysical black hole is not expected to experience anything dramatic as she crosses the event horizon. However, tentative resolutions to problems in quantum gravity, such as the cosmological constant problem, or the black hole information paradox, invoke significant departures from classicality in the vicinity of the...
Dr Alex Nielsen (MPI for Gravitational Phys)
We discuss the methods of data analysis and significance estimation used to search for black hole echoes. We conclude that current results do not provide sufficient observational evidence for claiming the existence of Planck-scale structure at black hole horizons and we suggest further techniques that could be used to explore this interesting possibility.
Dr Alex Nielsen (MPI for Gravitational Phys), M. Jahed Abedi (Sharif University of Technology)
Dr Archisman Ghosh (Nikhef)
The detections of the presumed binary black hole coalescences in the first observing run of Advanced LIGO have allowed us to probe the genuinely strong-field dynamics of Einstein's general theory of relativity for the first time, and put tight constraints on the inspiral-merger-ringdown dynamics of the binary coalescence process. Subsequent detections are expected to be able to more directly...
Mlle Anuradha Samajdar (Indian Institute of Science Education and Research Kolkata), Dr Chris Van Den Broeck (National Institute for Subatomic Physics)
Local Lorentz invariance is a cornerstone of general relativity (GR). The direct detection of gravitational waves (GWs) enables unique tests for possible violations of Lorentz invariance in the gravitational sector. Propagation effects of GWs in Lorentz violating theories of gravity lead to modified dispersion relations and dephasing of GWs with respect to the GR waveform. These may be...