Tag

Mini Universe

All articles tagged with #mini universe

science1 month ago•91 min saved

Time in a mini-universe, Arctic ice thickening, and a long-hidden Boston grave

This week’s science roundup highlights a Bose-Einstein condensate experiment where time emerges inside a mini-universe, NASA upgrading its ISS lab to study such quantum states, and other quantum advances including using quantum computers to create a fusion-relevant material; researchers also report a real-world attempt to thicken Arctic sea ice by flooding with seawater. Archaeology reveals one of the oldest graves of a free Black person in the U.S.—Sebastian, known as 'Boston,' who died in 1729 in Boston. In space news, China’s Tianwen-2 mission captured the first photo of Earth’s quasi-moon, hinting at future sample collection.

via Live Science|

#arctic-ice-thickening #bose-einstein-condensate #free-black-grave

science1 month ago•92 min saved

Time blooms from inside a tiny quantum universe

A Birmingham physicist created a nearly isolated Bose-Einstein condensate of ultracold rubidium atoms, split it into two halves, and showed that time can emerge from entropy exchange within the system—the entropic time—acting as an internal clock that speeds up, slows down, or stops as the halves exchange or cease entropy. The experiment, tied to ideas in quantum cosmology and the Wheeler–DeWitt equation, provides the first lab-based demonstration that relational time can arise from within a closed quantum system and even reproduces a Schrödinger-like description using this internal time.

via Live Science|

#bose-einstein-condensate #mini-universe #relational-time

science2 months ago•5 min saved

Time Emerges from Entropy: Lab Mini-Universe Redefines Temporal Reality

Physicist Giovanni Barontini built a lab-sized ‘mini-universe’ by cooling ~24,000 rubidium atoms into a Bose-Einstein condensate and trapping them in a two-region optical setup. The atoms’ movement between a bright (observed) and a dark (unobserved) sector creates entropy exchange that defines an internal, emergent time—time that flows due to entropy rather than an external clock—offering experimental insight into time in quantum gravity and cyclic cosmology.

via ScienceAlert|

#bose-einstein-condensate #entropy #mini-universe

science2 months ago•6 min saved

Dying Stars Could Birth Tiny Universes to Form Gravastars

A new theoretical study proposes that when a massive star collapses, it might birth a miniature universe inside the collapsing matter, driven by dark energy, expanding to counter gravity and halt collapse, thereby forming a stable gravastar instead of a black hole.

via ScienceDaily|

#dark-energy #general-relativity #gravastar

science2 months ago•10 min saved

Lab-made 24,000-atom cosmos hints time can emerge from entropy

Researchers built a sealed, two-region quantum system of 24,000 ultracold rubidium atoms that behaves like a tiny universe, cycling between expansion and contraction without any external clock. Time appears to flow from internal changes in entropy (entropic time), allowing the sequence of events to be inferred from within the system and offering a controllable testbed for ideas in quantum gravity and early-universe physics. The study also shows Schrödinger dynamics can be reformulated under this time concept and could help probe fundamental questions about the origin of time.

via Interesting Engineering|

#entropic-time #mini-universe #nature-of-time