Thursday, February 10, 2005

Your Car and the SpaceTime Continuum

One of the unintended side effects of naming my blog has turned out that I receive hits from those poor souls looking for advice on what to do about their car.

This is a relatively new blog, yet already I am number one in the yahoo search term "why did my catalytic converter go bad". (no quotes) One can almost detect yearning for knowledge, and relief from pain in such a plainly phrased question. It almost has that William Carlos Williams style. I am afraid they will find no help here. I am only mechanically inclined when it is forced upon me.

It is pretty evident from the snippets the search engines are grabbing that they won't find much in the way of help. I can only assume that for some of the searches where I am way in the uncharted territories that they are sick of trying to figure out why the thing is making so much noise and are hoping for a change of pace. Or, I am throwing some of these people for a curve.

Speaking of curves and uncharted territory, why don't I segue on over to time travel:
Time travels have become a scientific possibility in recent years. Spacetimes possessing closed timelike curves (CTCs) were originally discussed by Gdel, but it only was after recognition that negative-energy states can occur in semiclassical general relativity that time travels have been considered in greater detail. [Ringholes and closed timelike curves, Pedro F. Gonz´alez-D´ıaz,
Centro de F´ısica, Miguel Catal´an, Instituto de Matem´aticas y F´ısica Fundamental, Madrid (SPAIN)]
I will quote a few lines from the good doctor's abstract:
It is shown that in a classical spacetime with multiply connected space slices having the topology of a torus, closed timelikes curves are also formed. We call these spacetimes ringholes. Two regions on the torus surface can be distinguished which are separated by angular horizons.

On one of such regions (that which surrounds the maximum circunference of the torus) everything happens like in spherical wormholes, but the other region (the rest of the torus surface), while still possessing a chronology horizon and non-chronal region, behaves like a converging, rather than diverging, lens and corresponds to an energy density which is always positive for large speeds at or near the throat.

It is speculated that a ringhole could be converted into a time machine to perform time travels by an observer who would never encounter any matter that violates the classical averaged weak energy condition. Based on a calculation of vacuum fluctuations, it is also seen that the angular horizons can prevent the emergence of quantum instabilities near the throat.
If you have followed me this far, we would all have to understand stuff like the below to go much further:


I am afraid my American education has not prepared me for such rigors.


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