Taming time travel

July 26, 2010 | Source: Science News

Researchers led by Seth Lloyd at MIT have a new theory of time travel that evades the “grandfather paradox,” in which a traveler jumps back in time and kills his grandfather, which prevents his own existence.

This version is called a post-selected model, in which paradoxical situations are censored. A downside: this version causes possible but unlikely events to happen more frequently.