Einstein's Unfinished Revolution: The Search for What Lies Beyond the Quantum

by Lee Smolin

A recent realist approach to quantum mechanics is retrocausality, which supposes that causal effects can go backward as well as forward in time. Usually the effect follows the cause, but, the proponents of this view argue, sometimes the effect precedes the cause. By zigzagging backward and forward in time, a chain of causations can appear nonlocal,

But after a third or more of a century, during which many career-long efforts have failed to budge might be true any closer to must be true, isn’t it time to move on? You might think I’m repeating polemics from the string wars, but I’m thinking, with a great deal of affection, of all of us whose years of hard work have failed to yield the breakthroughs we fantasized about. Including myself; especially myself.