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April 1, 2021 03:20 pm

CERN's April Fools' Day Prank: Proposal For A 'Space Elevator' Accelerator

New submitter catmar68 writes: CERN proposes "space elevator" accelerator to answer this fundamental question: "Do antimatter apples fall up?" From the press release: The true question, they say, is whether antimatter apples fall down differently. If a difference were spotted, it would spell the end of "CPT invariance" -- a principle that has underpinned every theory of physics since the invention of quantum mechanics. "The Standard Model of particle physics has been very successful, but it can't explain the 95% of the universe which is 'dark', and neither Einstein nor any physicist since has been able to cook up a working theory of quantum gravity," says theorist Flora Oilp. "It's time to challenge its most fundamental principle head-on." The way forward, according to Oilp and her colleagues, is to build a vertical accelerator that will put gravity to the test directly. Every previous particle accelerator has been horizontal. A combination of high speeds and frequent course corrections using focusing magnets has always meant that the effect of gravity can be neglected. But by utilising a range of new, revolutionary techniques, including accelerating particles upwards inside a vacuum vessel, and timing how long they take to fall back down to Earth, physicists can study the elusive fourth force directly. Furthermore, by comparing results with protons and antiprotons, they can watch for signs of "CPT violation." Such behaviour cannot be explained using conventional theories, which rely on this principle to ensure the conservation of probability. The accelerator would be built in two stages. Stage one proposes a 500 m vertical accelerator, starting from the base of the LHC shafts. An exciting collaboration with NASA may come to fruition by utilising detectors on the International Space Station (ISS) to detect beams of particles fired by the accelerator every time the ISS is overhead. This "reverse cosmic-ray" experiment would allow the measurement of Earth's gravity on particle trajectories at unprecedented levels. Stage one will seek to match the roughly 1% precision on measurements of the gravitational constant "g," which is currently being targeted in parallel by experiments with antihydrogen at the Laboratory's Antimatter Factory. This moderate build will also allow engineers and physicists to understand the intricacies of running a vertical accelerator in preparation for stage two -- the space elevator. "If built, however, this advanced particle accelerator would nevertheless be three times taller than the Burj Khalifa in Dubai, which has been the tallest structure in the world since 2009."

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