ISRAELIS SKETCH OUT TIME MACHINE?

Israeli researchers tout time machine model (EE Times)
NETANYA, Israel — Researchers at the Technion University (Haifa, Israel) claim they have developed a theoretical model of a time machine that, in the distant future, could enable future generations to travel into the past. The team's findings were published in the latest issue of Physical Review.

"In order to travel back in time, the spacetime structure must be engineered appropriately," explains Professor Amos Ori of the Technion's Faculty of Physics. "This is what Einstein's theory of general relativity deals with. It says that spacetime can be flat. That is " it has a trivial, simple structure. But it can also be curved with various configurations."

The team stresses the main question is whether — according to the principles of curvature development in the theory of relativity — a time machine can be created. "In other words " can we cause spacetime to curve in such a way as to enable travel back in time? Such a journey requires a significant curvature of spacetime, in a very special form."

The researchers explain that traveling back in time is actually closing time-like curves so we can go back to an event at which we were present in the past. In flat space, it is not possible to close curves and go back in time. In order for closed time-like curves to exist, there has to be a curvature of a specific form on spacetime...

In the past, scientists raised a number of objections to this possibility. Now, Prof. Ori is proposing a theoretical model for spacetime that could develop into a time machine.