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  2. quantamagazine.org

    Listening for Gravity. Einstein's equations of general relativity are so complex that it took 40 years for most physicists to agree that gravitational waves exist and are detectable — even in theory. Einstein first thought that objects cannot shed energy in the form of gravitational radiation, then changed his mind.
  3. quantamagazine.org

    Fascinated by the contentious history of gravitational-wave research, Kennefick began a sideline as a historian; he is the author of the 2007 book Traveling at the Speed of Thought: Einstein and the Quest for Gravitational Waves, and last year he co-authored An Einstein Encyclopedia. In discussions before and after Thursday's big announcement ...
  4. quantamagazine.org

    Frans Pretorius, a gravitational-wave expert at Princeton University who was not involved in any of the recent studies, said that for more than a year, he and most of the physics community have been satisfied that LIGO's analysis, and its discovery, are sound.Nevertheless, he said, "it's important that finally there is a thorough analysis in the form of a paper," rather than "media ...
  5. quantamagazine.org

    Jun 28, 2023These gravitational waves are cousins to the echoes from black hole collisions first picked up by the Laser Interferometer Gravitational-Wave Observatory (LIGO) experiment in 2015. But whereas LIGO's waves might vibrate a few hundred times a second, it might take years or decades for a single one of these gravitational waves to pass by at the ...
  6. quantamagazine.org

    In February 2016, the leaders of the Laser Interferometer Gravitational-Wave Observatory (LIGO) announced that they had successfully detected gravitational waves, subtle ripples in the fabric of space-time that had been stirred up by the collision of two black holes. The team held a press conference in Washington to announce the landmark findings.
  7. quantamagazine.org

    Oct 30, 2024We pick up light waves with our eyeballs, but gravitational waves are another matter. It took decades of effort and the construction of the colossal, miles-long detectors that make up the Laser Interferometer Gravitational-Wave Observatory (LIGO) to first sense a rumble in space-time in 2015 — one sent out by a collision between distant black ...
  8. quantamagazine.org

    Even coherent gravitational waves produce graviton noise, but — as Dyson also found — it's far too small to ever measure. This is because the jitter created as the detector absorbs gravitons is "exquisitely balanced" with the jitter created when it emits gravitons, said Wilczek, who had hoped that their calculation would lead to a bigger noise for coherent states.
  9. quantamagazine.org

    These "gravitational waves" rippled outward and, on Sept. 14, 2015, swept past Earth, strumming the ultrasensitive detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO). LIGO's discovery , announced in February, triumphantly vindicated Albert Einstein's 1916 prediction that gravitational waves exist .
  10. quantamagazine.org

    Our ears are now open to gravity's faint symphony. On September 18, the Advanced Laser Interferometer Gravitational-Wave Observatory, or Advanced LIGO, began to listen for gravitational waves, cosmic ripples that subtly warp the fabric of space-time.Albert Einstein solved the equations that implied that these waves should exist, and nearly a century later, hopes are high that Advanced LIGO ...

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