Our universe exists only by the merest chance, say some. They cite the fact that various physical constants need to be just so for it to exist and continue the way that it does. These include the speed of light, the charges of nuclear particles, and the ratios of the four fundamental forces: gravity, electromagnetism, and both weak and strong nuclear forces. In This article considers the idea that a universe only pops into existence when its physical constants are such that they might be observed!
Let's examine that idea using the Chess Plus analogy.
If we use chess moves to represent slivers, then the rules of the game, or its laws, allow you to divide into two sets all slivers: those that follow the rules and those that don't.
For every chess position, if it is to be legally possible, there are rules that must be obeyed. There is the initial positioning of the pawns and pieces, of which there are specified numbers of each. Each has a prescribed way of moving. There are thus pathways to go from one permissible position to another. So for example, because of the way that pawns move, it is impossible to play a game backward just as, according to the rules of our universe, we can't go backward in time.
All 'impossible' positions - such as a pawn on the first rank, or two same-colored bishops on the same-color squares (unless a pawn has been promoted) or even two pieces on the same square could never arise during play. They would not 'pop up' in the chess universe.
A physical law then, or group of laws, defines a certain set of linked slivers. It, or they, specify a particular universe. And that universe is closed to other slivers. As far as the denizens of that universe are concerned, they do not exist. There is no connection, because the sets simply do not intersect.