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    Home » The Universe in a lab: Testing alternate cosmology using a cloud of atoms
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    The Universe in a lab: Testing alternate cosmology using a cloud of atoms

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    The Universe in a lab: Testing alternate cosmology using a cloud of atoms
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    Enlarge / Density waves in a Bose-Einstein condensate.

    In the basement of Kirchhoff-Institut für Physik in Germany, researchers have been simulating the Universe because it might need existed shortly after the Big Bang. They have created a tabletop quantum discipline simulation that entails using magnets and lasers to regulate a pattern of potassium-39 atoms that’s held near absolute zero. They then use equations to translate the outcomes at this small scale to discover doable options of the early Universe.

    The work completed up to now reveals that it’s doable to simulate a Universe with a completely different curvature. In a positively curved universe, when you journey in any route in a straight line, you’ll come again to the place you began. In a negatively curved universe, house is bent in a saddle form. The Universe is presently flat or practically flat, in line with Marius Sparn, a PhD scholar at Kirchhoff-Institut für Physik. But initially of its existence, it might need been extra positively or negatively curved.

    Around the curve

    “If you have a sphere that’s really huge, like the Earth or something, if you see only a small part of it, you don’t know—is it closed or is it infinitely open?” stated Sabine Hossenfelder, member of the Munich Center for Mathematical Philosophy. “It becomes a philosophical question, really. The only things we know come from the part of the Universe we observe. Normally, the way that people phrase it is that, for all we know, the curvature in this part of the Universe is compatible with zero.”

    Sparn was one of the authors of a analysis paper, “Quantum Field Simulator for Dynamics in Curved Spacetime,” which was revealed in Nature in November 2022. He collaborated with scientists from Belgium, Spain, and Germany. The workforce studied three doable eventualities for the Universe’s early enlargement—fixed, accelerated, and decelerated.

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    The tabletop experiment concerned placing the potassium-39 in a glass cell between a set of massive magnetic coils above and under it, Sparn stated. These magnetic coils, together with some lasers, have been used to regulate the conduct of the pattern. The atoms have been trapped in a skinny layer that may be thought of two-dimensional, in line with a press assertion from Heidelberg University.

    When cooled to a temperature of 40 to 60 nanokelvins, Sparn stated, the potassium-39 enters a quantum-mechanical state that is called a Bose-Einstein condensate. Bose-Einstein condensates operate as a single megaparticle, in line with Ramon Szmuk, product supervisor at Quantum Machines.

    “Our Bose-Einstein condensate is an object that’s completely governed by quantum mechanics because we work at very, very low temperatures,” Sparn stated. “The team is then looking for small perturbations of [the] condensate. So you can imagine it as small ripples of density fluctuations. These are governed by quantum mechanics.”

    “A single run of our experiment ends with taking a picture, obviously,” Sparn stated. “So we shine in light that’s resonant with an atomic transition of potassium-39 and we take absorption images of the cloud. And in this process, we typically destroy our condensate. We see less light where there have been atoms. We can extract the density of atoms from that. So our final result is always an image of the density distribution of our atoms. And from there, we can make statistical analysis to get more information about the results.”

    Alternate universes

    The scientists match collectively equations for the Universe and equations for the Bose-Einstein condensate to attract conclusions about how the early Universe might need behaved.

    Sparn stated the workforce simulated constructive curvature by rising the density of the potassium-39 going outward from the middle of the experimental setup. They simulated adverse curvature by lowering it.

    “We showed that it is possible to simulate spatially curved and expanding spacetimes in a Bose-Einstein condensate,” Sparn stated. “This is what you need for a homogeneous and isotropic universe, which should be a fair assumption on large scales.”

    During the previous few years, scientists have been using quantum atomic techniques to search out analogies to advanced techniques in the cosmos, Szmuk stated. This connects atomic physics and astrophysics.

    Nature, 2023.  DOI: 10.1038/s41586-022-05313-9

    Kat Friedrich is a former mechanical engineer who began out as an utilized arithmetic, engineering, and physics main on the University of Wisconsin-Madison. She has accomplished a graduate diploma specializing in science and environmental journalism and has edited seven information publications, two of which she co-founded. She is the editor in chief of the vitality journal Solar Today. 

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