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Even In A Quantum Universe, Space And Time Might Be Continuous ...
When you hear 'quantum,' you probably think of splitting everything into discrete, indivisible chunks. That's not necessarily right. Nov 8, 2019 ... Quantum doesn't necessarily mean that every property breaks down into an indivisible chunk. In conventional quantum field theory, spacetime is ... [ReadMore..]
PBS Space Time | PBS
Blast off into the cosmos with astrophysicist Matt O'Dowd. Quantum Physics in a Mirror Universe. Preview: S5 | 12m 19s. Providing Support for PBS.org. Learn More about PBS online sponsorship ... [ReadMore..]
Quantum Space, Quantum Time, And Relativistic Quantum Mechanics
We treat space and time as bona fide quantum degrees of freedom on an equal footing in Hilbert space. Motivated by considerations in quantum gravity, we focus on a paradigm dealing with linear, first-order Hamiltonian and momentum constraints that lead to emergent features of temporal and spatial translations. Unlike the conventional treatment, we show that Klein-Gordon and Dirac equations in relativistic quantum mechanics can be unified in our paradigm by applying relativistic dispersion relations to eigenvalues rather than treating them as operator-valued equations. With time and space being treated on an equal footing in Hilbert space, we show symmetry transformations to be implemented by unitary basis changes in Hilbert space, giving them a stronger quantum mechanical footing. Global symmetries, such as Lorentz transformations, modify the decomposition of Hilbert space; and local symmetries, such as $U(1)$ gauge symmetry are diagonal in coordinate basis and do not alter the decomposition of Hilbert space. Apr 20, 2020 ... Abstract: We treat space and time as bona fide quantum degrees of freedom on an equal footing in Hilbert space. [ReadMore..]
Do We Create Space-time? A New Perspective On The Fabric Of Reality ...
For the first time, it is possible to see the quantum world from multiple points of view at once. This hints at something very strange – that reality only takes shape when we interact with each other Feb 2, 2022 ... When quantum theory arrived a few years later, things got even weirder. It seemed to show that by measuring things, we play a part in ... [ReadMore..]
Francesca Vidotto: The Quantum Properties Of Space-Time - JSTOR ...
Theoretical physicist Francesca Vidotto on feminist epistemology, white holes, string theory, and her book (with Carlo Rovelli) on loop quantum gravity. May 29, 2020 ... Loop quantum gravity is a theory with the goal of describing the quantum properties of space-time. The main realization is the fact that, ... [ReadMore..]
Was Einstein Wrong? The Case Against Space-time Theory. | Space
If Einstein was wrong, could killing off space-time theory help us better understand the universe? According to Einstein, space-time is warped by matter and energy, but quantum physics says matter and energy exist in ... [ReadMore..]
Quantum Spacetime - Wikipedia
In mathematical physics, the concept of quantum spacetime is a generalization of the usual concept of spacetime in which some variables that ordinarily ... [ReadMore..]
Quantum Theory And The Structure Of Space-Time
We argue that space and space-time emerge as a consequence of the dynamical collapse of the wave function of macroscopic objects. Locality and separability are properties of our approximate, emergent universe. At the fundamental level, space-time is non-commutative, and its dynamics is non-local and non-separable. Jun 16, 2018 ... The time that appears in quantum theory is part of a classical space-time, whose geometry is determined by macroscopic classical bodies, ... [ReadMore..]
One Lab's Quest To Build Space-Time Out Of Quantum Particles ...
For over two decades, physicists have pondered how the fabric of space-time may emerge from some kind of quantum entanglement. In Monika Schleier-Smith’s lab at Stanford University… Sep 7, 2021 ... For over two decades, physicists have pondered how the fabric of space-time may emerge from some kind of quantum entanglement. [ReadMore..]
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What Is Spacetime Really Made Of? - Scientific American
Spacetime may emerge from a more fundamental reality. Figuring out how could unlock the most urgent goal in physics—a quantum theory of gravity Feb 1, 2022 ... While quantum physics treats space and time as immutable, general relativity warps them for breakfast. Somehow a theory of quantum gravity would ... [ReadMore..]
Loop Quantum Gravity: Does Space-time Come In Tiny Chunks? | Space
Are there fundamental units of space-time at some unfathomably tiny scale? Feb 23, 2022 ... Einstein's theory of general relativity tells us that the warping of space and time is what we experience as the force of gravity. Quantum ... [ReadMore..]