**Worm hole:** A theoretical "tunnel" linking distant locations of spacetime through which time and space travel between hypothetical parallel universes would be possible. The theoretical tunnel or throat would resemble an umbilical-like connection with at least two mouths on either side of the parallel universes. Prof. Amos Ori, Technion University, Haifa, Israel, has been proposing such a hypothetical mathematical topology with valid solutions within the framework of general relativity since at least 2005 with his submissions to Physical Review journal.

[ note: the source of the abstract pdf download is Cornell University Library for Physics, Mathematics, Computer Science, Quantitative Biology and Statistics -- http://arxiv.org/pdf/gr-qc/0503077 ]