It is the last evidence of the validity to theory of General Relativity. 1915 Albert Einstein predicted the existence of gravitational waves in his epochal work. These are caused by relativity, when crowds are accelerated in the cosmos. Only, No one can measure so far. For the first time succeeded and measured this physical sensation.Wow, what a timing. November 25, 1915, the German physicist Albert Einstein from the Prussian Academy of Sciences in Berlin presented the core of his ground-breaking theory of general relativity. Is the genius of the century predicted the existence of mysterious ripples of space-time, the so-called gravitational waves. These arise always then, when in the universe masses accelerate. They are stronger, depending on the moving body has more mass. You compress and stretch the space, much as the waves of a stone thrown into the water ripples the surface of the water.
Albert Einstein didn’t believe in detection of gravitational waves
Only these gravitational waves curling the space are usually so tiny that even Albert Einstein did not believe that it could ever manage to measure it. For 50 years now, physicist chasing the direct detection of gravitational waves. So far in vain. Until yesterday, the existence of this mysterious gravitational waves, which after great cosmic events take dents in the time-space continuum and then hunt with the speed of light through space, was therefore nothing more than a plausible theory.
More than 1000 authors have published the sensation
Now, physicists have demonstrated the echoing after signals of gravitational waves. Yesterday afternoon, the astrophysicist of the Advanced laser announced Interferometer Gravitational-wave Observatory (aLigo) in the United States of a major press conference. Right in several cities around the globe they had loaded into a press Marathon, to announce their results. The sensation was announced in Washington, Moscow, Paris, Pisa, London and Hanover and published simultaneously in the journal “Physical Review Letters”. More than 1000 authors have written the eight-page article.
“We have detected note waves”, announced the head of aLigo experiment, David Reitze, yesterday in Washington of the astonished world. The decisive signal went astrophysicists already on 14 September 2015 into the net at 10:51. But it took some months to every smallest doubt was dispelled, that the signal was really caused by a gravitational wave and was no trouble.
Reverberation of a gigantic cosmic collision
“It is not only a question of computer power. We have 100,000 channels of data can air pressure, temperature, vibration and so on measure, saying you afterwards, if there was a disturbance, whether someone has sung out loud or if a cosmic ray shower came in. That must all looked at and evaluated, many people discuss with each other that takes time”, said Karsten. He is doing research at the Max Planck Institute for gravitational physics in Hanover and was involved in the discovery of gravitational waves. It was the halls after a truly gigantic cosmic collision. Two medium weight black holes, the one with 36 and the other 29 solar masses, are fused together 1.3 billion years ago. An as equivalent to 1.99 Quadrilliarden tons.
Signal was measured on 14 September 2015
“It was written in a time when just the first multicellular life evolved on Earth,” said Gabriela Gonzáles of the aLigo experiment. “They circled around each other with a speed half as fast as light faster and faster, until they merged into a single black hole.” In the last phase, which was less than a second, the newly merged black holes broadcast off then gravitational waves, which were strong enough to discover them. On 14 September 2015, the gravitational waves of the cosmic giant merger spreading with the speed of light then arrived on Earth.
And changed the length of two vacuum tubes here on Earth. These are the detectors of the aLigo experiment. These tubes are nothing more than an extremely enlarged construction of Michelson Interferometer that is well known in the optics. Spatial changes in length on the small scale of the wavelengths of light can be measured with this instrument, exactly.
Length is changed to the hundredths of a diameter of a hydrogen atom
This Interferometer a laser laboratory are typically available. The two tubes in the aLigo experiment, however, are both exactly four kilometers long and are at a 90-degree angle. A laser beam is split into two laser beams through a beam splitter and sent into the tubes. At the end of the tube, hang as a quadruple pendulum designed extremely flat mirror and reflect the laser light back. A detector records the cinema of the superposition of two waves of reflected laser light and can detect so changes the length of the tube.