(PhysOrg.com) -- Among the many intriguing concepts in Einstein’s relativity theories is the idea of closed timelike curves (CTCs), which are paths in spacetime that return to their starting points. As ...

Physics - General Physics

Mar 01, 2011 4.6 / 5 (39) 91 |

(PhysOrg.com) -- The possibility of going back in time only to kill your ancestors and prevent your own birth has posed a serious problem for potential time travelers, not even considering the technical details ...

Physics - Quantum Physics

Jul 21, 2010 4.1 / 5 (57) 96 |