Wormholes are an inference of general relativity. As for whether it exists, no one knows. According to the general theory of relativity, the space-time around an object with very high energy collapses. If an object has enough energy, it can bend the whole space greatly, which is equivalent to folding a piece of paper in half and then narrowing the distance between the two places. This is a wormhole.

For wormholes, quantum theory is also involved. Love, Stan and Rosen wrote a paper in 1935, which was then called a bridge, but now it is called a wormhole. But they found that wormholes can't last long, so they must give space-time a negative curvature, and of course they need substances with negative energy density, so this is a problem. The classical law does not allow this, so we have to use the quantum theory of quantum mechanics to allow the energy density in some places to be negative, but as long as there is truth in other places. The compensation for energy density is that energy remains positive. Casimir effect is a good example. We can't do this now. Only advanced civilizations, such as alien spacecraft, can explain the disappearance of wormholes at once. In addition, if so, he can control the opening time of the wormhole.