Mar 9, 2025 02:58 AM
(This post was last modified: Mar 9, 2025 06:28 PM by C C.)
The world is not a quantum wave function - Why reality is non-local and the wave function isn't real
https://iai.tv/articles/the-world-is-not..._auid=2020
INTRO: The world of quantum physics is a very different world from the day-to-day reality we experience. In the quantum world, interactions across vast distances can occur, non-local interactions. Some quantum ontologies try to explain non-locality using a high-dimensional wave function. But Professor of Philosophy of Science, Valia Allori argues we need to bring our theories back down to three-dimensional Earth, albeit with the inevitable sacrifice of a local universe... (MORE - details)
‘Next-level’ chaos traces the true limit of predictability (slaying Laplace demons)
https://www.quantamagazine.org/next-leve...-20250307/
INTRO: The French scholar Pierre-Simon Laplace crisply articulated his expectation that the universe was fully knowable in 1814, asserting that a sufficiently clever “demon” could predict the entire future given a complete knowledge of the present. His thought experiment marked the height of optimism about what physicists might forecast. Since then, reality has repeatedly humbled their ambitions to understand it.
One blow came in the early 1900s with the discovery of quantum mechanics. Whenever quantum particles are not being measured, they inhabit a fundamentally fuzzy realm of possibilities. They don’t have a precise position for a demon to know.
Another came later that century, when physicists realized how much “chaotic” systems amplified any uncertainties. A demon might be able to predict the weather in 50 years, but only with an infinite knowledge of the present all the way down to every beat of every butterfly’s wing.
In recent years, a third limitation has been percolating through physics — in some ways the most dramatic yet. Physicists have found it in collections of quantum particles, along with classical systems like swirling ocean currents. Known as undecidability, it goes beyond chaos. Even a demon with perfect knowledge of a system’s state would be unable to fully grasp its future.
“I give you God’s view,” said Toby Cubitt, a physicist turned computer scientist at University College London and part of the vanguard of the current charge into the unknowable, and “you still can’t predict what it’s going to do.”
Eva Miranda, a mathematician at the Polytechnic University of Catalonia (UPC) in Spain, calls undecidability a “next-level chaotic thing.”
Undecidability means that certain questions simply cannot be answered. It’s an unfamiliar message for physicists, but it’s one that mathematicians and computer scientists know well. More than a century ago, they rigorously established that there are mathematical questions that can never be answered, true statements that can never be proved. Now physicists are connecting those unknowable mathematical systems with an increasing number of physical ones and thereby beginning to map out the hard boundary of knowability in their field as well.
These examples “place major limitations on what we humans can come up with,” said David Wolpert, a researcher at the Santa Fe Institute who studies the limits of knowledge but was not involved in the recent work. “And they are inviolable.” (MORE - details, no obtrusive ads)
https://iai.tv/articles/the-world-is-not..._auid=2020
INTRO: The world of quantum physics is a very different world from the day-to-day reality we experience. In the quantum world, interactions across vast distances can occur, non-local interactions. Some quantum ontologies try to explain non-locality using a high-dimensional wave function. But Professor of Philosophy of Science, Valia Allori argues we need to bring our theories back down to three-dimensional Earth, albeit with the inevitable sacrifice of a local universe... (MORE - details)
‘Next-level’ chaos traces the true limit of predictability (slaying Laplace demons)
https://www.quantamagazine.org/next-leve...-20250307/
INTRO: The French scholar Pierre-Simon Laplace crisply articulated his expectation that the universe was fully knowable in 1814, asserting that a sufficiently clever “demon” could predict the entire future given a complete knowledge of the present. His thought experiment marked the height of optimism about what physicists might forecast. Since then, reality has repeatedly humbled their ambitions to understand it.
One blow came in the early 1900s with the discovery of quantum mechanics. Whenever quantum particles are not being measured, they inhabit a fundamentally fuzzy realm of possibilities. They don’t have a precise position for a demon to know.
Another came later that century, when physicists realized how much “chaotic” systems amplified any uncertainties. A demon might be able to predict the weather in 50 years, but only with an infinite knowledge of the present all the way down to every beat of every butterfly’s wing.
In recent years, a third limitation has been percolating through physics — in some ways the most dramatic yet. Physicists have found it in collections of quantum particles, along with classical systems like swirling ocean currents. Known as undecidability, it goes beyond chaos. Even a demon with perfect knowledge of a system’s state would be unable to fully grasp its future.
“I give you God’s view,” said Toby Cubitt, a physicist turned computer scientist at University College London and part of the vanguard of the current charge into the unknowable, and “you still can’t predict what it’s going to do.”
Eva Miranda, a mathematician at the Polytechnic University of Catalonia (UPC) in Spain, calls undecidability a “next-level chaotic thing.”
Undecidability means that certain questions simply cannot be answered. It’s an unfamiliar message for physicists, but it’s one that mathematicians and computer scientists know well. More than a century ago, they rigorously established that there are mathematical questions that can never be answered, true statements that can never be proved. Now physicists are connecting those unknowable mathematical systems with an increasing number of physical ones and thereby beginning to map out the hard boundary of knowability in their field as well.
These examples “place major limitations on what we humans can come up with,” said David Wolpert, a researcher at the Santa Fe Institute who studies the limits of knowledge but was not involved in the recent work. “And they are inviolable.” (MORE - details, no obtrusive ads)
