The basic shape that best describes our expanding universe is also the hardest shape for physicists to understand. <p>The post <a href="https://www.quantamagazine.org/in-expanding-de-sitter-space-quantum-mechanics-gets-even-more-elusive-20260330/" target="_blank">In Expanding de Sitter Space, Quantum Mechanics Gets Even More Elusive</a> first appeared on <a href="https://www.quantamagazine.org" target="_blank">Quanta Magazine</a></p>
In theory, a universe can come in any shape or size, but scientists prefer to think about three basic kinds of universes: one that’s expanding, one that’s collapsing, and one that stays the same. Out of these three simplified models, an expanding universe is the hardest for physicists to understand. Yet it’s exactly the one our real world most resembles. When physicists calculate what’s going on…
de Sitter space is a model of the universe that describes a space with a positive cosmological constant, leading to an expanding universe. It is significant in cosmology and theoretical physics as it provides insights into the behavior of the universe under the influence of dark energy.
Quantum mechanics in cosmology explores the intersection of quantum physics and cosmological models. It addresses fundamental questions about the early universe, the nature of space and time, and the behavior of particles in extreme conditions.