Time Might Only Exist in Your Head. And Everyone Else's | WIREDHowever, the two scientists who penned this recent paper say that, in the Wheeler-DeWitt equation, gravity's effects kick in too slowly to account for a universal arrow of time. "If you look at examples and do the math, the equation doesn't explain how time's direction emerges," says Robert Lanza, a biologist, polymath, and co-author of the paper. (Lanza is the founder of biocentrism, a theory that space and time are constructs of biological sensory limitations.) In other words, those nimble quantum particles ought to be able to keep their property of superposition before gravity grabs hold. And if, say, gravity is too weak to hold an interaction between two molecules as they decohere into something larger, then there's no way it can force them to move in the same direction, time-wise.