Black holes admit quantum mechanical bound states of ultra light particles such axions or neutrinos. These states can undergo quantum transitions absorbing or emitting gravitons. Graviton trajectories, in the particle picture, in principle can correspond to gravitons that orbit the black hole arbitrarily many times before finally escaping to infinity. Quantum mechanically, such graviton trajectories correspond to graviton-black hole scattering states which exhibit an arbitrarily large time delay before they emerge at infinity. The spontaneous emission of such graviton states coupled with their subsequent stimulated emission as the graviton circles around the black hole through the lasing medium, can in principle give rise to significant amplification. The observation of intense, monochromatic beams of coherent gravitons would then be a confirmation of the existence of ultra light massive particles and shed light on the properties of black holes.

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2019-01-23T13:00:002019-01-23T14:00:00New Sources of Gravitational Radiation: The Black Hole Graviton LaserEvent Information:
Black holes admit quantum mechanical bound states of ultra light particles such axions or neutrinos. These states can undergo quantum transitions absorbing or emitting gravitons. Graviton trajectories, in the particle picture, in principle can correspond to gravitons that orbit the black hole arbitrarily many times before finally escaping to infinity. Quantum mechanically, such graviton trajectories correspond to graviton-black hole scattering states which exhibit an arbitrarily large time delay before they emerge at infinity. The spontaneous emission of such graviton states coupled with their subsequent stimulated emission as the graviton circles around the black hole through the lasing medium, can in principle give rise to significant amplification. The observation of intense, monochromatic beams of coherent gravitons would then be a confirmation of the existence of ultra light massive particles and shed light on the properties of black holes.Event Location:
Henn 318