Data: 22.07.2020 (quarta-feira)
Gravity wave detections and squeezed light (seminário em inglês)
A hundred years after Einstein argued that his new theory of gravity (General Relativity as it is now called) contained the possibility of gravity waves,they were detected by the LIGO detectors in the USA. While Einstein had dismissed the possibility that these waves could ever be detected, they were detected, measuring fractional changes in the lengths of the detector arms of about 1 part in 10^22. At these scales the dominant noise in the detectors is that due to the quantum mechanics of the motion of the 40kg masses in the mirrors of the detectors. This talk will review gravity wave, their sources, the detectors and the proposals to increase the sensitivity by "evading" the naive limits which the quantum mechanics of the detectors place on the detection (light squeezing).