5. September 2018
Prof. Bobomurat Ahmedov
Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences, Tashkent
National University of Uzbekistan, Tashkent
The advanced laser interferometric gravitational-wave detectors LIGO and VIRGO have recently become observatories which are able to detect transient gravitational-wave signals from the coalescence of gravitational compact objects. This has led to triumphal discoveries awarded with the Nobel prize, which started on September 14, 2015 as GW150914, with the first direct detection of gravitational waves from the coalescence of a binary system of massive black holes by the Advanced LIGO detectors in two different cites of the States. Then the several gravitational wave signals were detected from black holes mergers.The next epochal discovery happened on August 17, 2017, with the first direct observations of gravitational waves from the inspiral and merger of a binary neutron-star system by the Advanced LIGO and Virgo collaborations as GW170817, followed 1.7 s later by a weak short gamma-ray burst detected by the Fermi and INTEGRAL satellites. A world-wide observing campaign involving about 70 space and ground based observatories has led to the detection of multi-wavelength electromagnetic signals associated with this event. A new multimessnger era in astronomy and exploration of the most energetic transients in the sky has started. In the presentation I will give an overview of the gravitational waves prediction, detectors development, recent gravitational-wave and multi-messenger observations and their astrophysical and physical implications.