Although researchers have come up with ideas for how they might find clues to its existence-around black holes in the early universe or even using LIGO, the National Science Foundation-funded observatories that detect gravitational waves-no one has yet turned up any hints of quantum gravity in nature. The problems come up when you ask subtle questions about black holes or try to merge the theories at very short distance scales.”īecause of the incredibly small scales in question, some scientists have deemed finding evidence of quantum gravity in the foreseeable future to be an impossible task. “But we know from experiments that we can do quantum mechanics on this planet, which has gravity, so clearly they are consistent. “Sometimes there is a misinterpretation in science communication that implies quantum mechanics and gravity are irreconcilable,” says Cliff Cheung, Caltech professor of theoretical physics.
At the core of the mystery is the question of whether gravity, and the spacetime it inhabits, can be “quantized,” or broken down into individual components, a hallmark of the quantum world. Quantum gravity refers to a set of theories, including string theory, that seeks to unify the macroscopic world of gravity, governed by general relativity, with the microscopic world of quantum physics. “A spacetime pixel is so small that if you were to enlarge things so that it becomes the size of a grain of sand, then atoms would be as large as galaxies,” he says.Īdhikari and scientists around the world are on the hunt for this pixelation because it is a prediction of quantum gravity, one of the deepest physics mysteries of our time. Scientists such as Rana Adhikari, professor of physics at Caltech, think the space we live in may not be perfectly smooth but rather made of incredibly small discrete units. The universe itself may be similarly pixelated. The same is true for digital images: zoom far enough into an apparently perfect portrait and you will discover the distinct pixels that make the picture. Touch the surface and you would find individual grains. As you approach the dunes, you may notice ripples in the sand. But a closer inspection reveals much more. To learn more, see the privacy policy.Sand dunes seen from afar seem smooth and unwrinkled, like silk sheets spread across the desert. Please note that Urban Thesaurus uses third party scripts (such as Google Analytics and advertisements) which use cookies.
Boinc projects quantum gravity code#
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