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Gravitational waves

Several major experiments using highly sensitive laser interferometers have been designed to detect gravitational waves.

  1. LIGO US experiment.
  2. VIRGO Italian-French experiment.
  3. GEO 600 German-British experiment.
  4. TAMA Japanese experiment.

In February of this year, to great acclaim, the LIGO experiment announced that they had detected a gravitational wave signal on the 14th of September 2015. The signal has been identified as originating from the merger of two 30 solar mass black holes at a distance of over a billion light years. It is awe-inspiring that such observations can be made. The historic paper is freely available and strongly recommended, as is a subsequent paper announcing a second gravitational wave detection:

Observation of Gravitational Waves from a Binary Black Hole Merger, Phys. Rev. Lett. 116, 061102 (2016)

GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence, Phys. Rev. Lett. 116, 241103 (2016)