MG11 
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Results from LIGO Observations

The Laser Interferometer Gravitational-wave Observatory (LIGO) detectors have reached their design sensitivity, and searches for gravitational waves are ongoing. We discuss the status of searches for transient gravitational-wave signals. Candidate signals include gravitational waves from the coalescence of binary neutron star/black hole systems and unmodelled sub-second bursts of gravitational radiation, such as those produced during core-collapse supernovae, or associated with gamma-ray bursters. We discuss current efforts to detect gravitational waves from these sources and comment on future prospects for these searches.

An extremality condition for dynamical horizons

We introduce a notion of black hole extremality which is valid on both dynamical and isolated horizons. On an isolated horizon, it agrees with the standard definition of extremality based on vanishing surface gravity. We show that all dynamical horizons must be sub-extremal. Thus, we are able to place a restriction on the total angular momentum of a dynamical horizon.

An extremality condition for dynamical horizons

We introduce a notion of black hole extremality which is valid on both dynamical and isolated horizons. On an isolated horizon, it agrees with the standard definition of extremality based on vanishing surface gravity. We show that all dynamical horizons must be sub-extremal. Thus, we are able to place a restriction on the total angular momentum of a dynamical horizon.