The chronology protection conjecture is a hypothesis first proposed by #StephenHawking that laws of physics beyond those of standard general relativity prevent time travel on all but microscopic scales - even when the latter theory states that it should be possible (such as in scenarios where faster than light travel is allowed).
#briangreene #chronologyprotectionconjecture #stephenhawkings #timetravel #stephenhawkingstimetravel #closedtimelikecurve