Quantum Bounce: A Universe Without Singularity ⚡ экспресс
A rigorous description of the quantum Big Bounce is given for a closed universe with a scalar field and an ekpyrotic potential. The equivalence of parameterizations using the scale factor and volume is demonstrated. Drawing an analogy with the Klein–Gordon equation allowed two scenarios to be distinguished: one (as in loop quantum cosmology) with a fixed arrow of time, though it diverges at high energies; the other features time reversal (ekpyrotic) and works at all energies to first order. Thus, the Wheeler–DeWitt quantum theory itself can bypass the singularity, and adding corrections recovers the bounce proposed by the Ashtekar school.
A spring compressed to the limit breaks. Likewise, classical gravity theory leads to a singularity—a point where all laws break down. Quantum mechanics turns this end into an elastic bounce. Wheeler and DeWitt described the universe as a wave of probabilities. A new model applies this to space closed like a ball. Energy, like a built-in spring, makes it contract and expand.
Physicists discovered two scenarios. The first resembles the usual flow of time—expansion after contraction, as in some approaches. But at high energies, the spring 'jams': calculations require corrections.
The second scenario is elegant: the Big Bang becomes a Big Bounce, and time reverses. Past and future swap places. The bounce works on its own, without crutches.
The quantum world smooths out spacetime curvature in the infant universe. The idea can be tested via the cosmic microwave background—perhaps it hides ring-like patterns of gravitational waves.
🎯 According to one scenario, the universe arose from the collision of two three-dimensional membranes in a space with more dimensions.