IndIGO, the Indian Initiative in Gravitational-wave Observations, is an initiative to set up advanced experimental facilities, with appropriate theoretical and computational support, for a multi-institutional Indian national project in gravitational-wave astronomy. Since 2009, the IndIGO Consortium has been involved in constructing the Indian road-map for Gravitational Wave Astronomy and a phased strategy towards Indian participation in realizing the crucial gravitational-wave observatory in the Asia-Pacific region. The current major IndIGO plans on gravitational-wave astronomy relate to the LIGO-India project. LIGO-India an advanced gravitational-wave detector to be located in India, to be built and operated in collaboration with the LIGO USA and its international partners.
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The existence of gravitational waves is one of the most intriguing predictions of the General Theory of Relativity proposed by Albert Einstein in 1915. Gravitational waves are distortions in the spacetime geometry that propagate with the speed of light, analogous to ripples on the surface of a pond. On 2015 September 14, the two Advanced LIGO observatories in the USA made the first direct observation of gravitational waves passing through the earth. This signal was produced by the merger of two black holes at a distance of 1.3 billion light years. This is the first of the many expected observations of this kind, that will establish the filed of gravitational-wave astronomy, opening a new window on to the Universe.
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