X-Message-Number: 3365 Date: 30 Oct 94 14:12:32 EST From: yvan Bozzonetti <> Subject: CRYONICS : Halloween subject. Today subject may be seen as dubious: It is time travel! Think about it: You can get informations on any epoch, anywhere. I assume here simply time travel for informations, not material objects. Displacing mass backward in time would collide head on with many conservation laws in physics. Information, on the other side is not conservative: it can be duplicated at infinite, if you have it even if you give it to anybody. Time arrow seems linked to thermodynamics, itself rooted in event horizons such the ones found in black holes. It seems information works somewhat as a cosmological constant and can so suppress horizons, there would be then naked singularities with time travel capabilities for information. One possibletime machine would be built from a worm hole with one mouth moved at relativistic celerity along a closed trip. Worm holes are holes in the fabric of space time. There are two kind of them: the quantum ones at 10^-33 cm and the classical at any other scale. A worm hole establish a short link between two distant part of the space time: If there is a worm hole between A and B, there are two shortest paths between these points, one in the classical space, may be many billions of ligth year long and many billions of years in time, and another in the worm hole with nearly no distance and duration. The worm hole travel problem holds in that: any positive mass entering it pinches off the tunnel and get destroyed in a space time singularity. The only solution is then to poor in the hole more negative mass than the positive one loaded with information. Quantum fluctuations have, on the average no energy and so no mass, but for a short time there can be a positive energy, a virtual particle-antiparticle bunch. That must be compensated at another instant, elswhere by a negative energy with a negative mass. In flat space-time there is no way to to pick up the ones or the others, but a gravitational field do the job: The stronger the gravitational acceleraton, the shorter the separated quantum fluctuations and the more energetic they can get. The positive fluctuations become a real, thermal radiation and the negative energy falls in the gravitational field and reduce it. The gravitational field at the Earth surface produces a 10^-24 K thermal radiation in both, electromagnetism and gravitational wave. This translates into a spectrum peaked near a one ligth year wavelength. If we could detect such radiations, we would see quantum electromagnetic fluctuation with sligtly shorter wave continualy pinching off worm holes. Now, recall the casimir effect: Two conducting, parallele plates are pushed the one against the other. This is so, because they work as resonators and excludes some frequencies in the quantum fluctuations between them. The corresponding presure disapears on the inside faces, but not on the outside facing side, so there is a pressure squashing space between the plates. Now, translates that for worm hole: A "plate" in four dimension would be just a three dimensional sphere such the Earth, if there is another conducting sphere somewhere with a gravitational field, then it can form the other mouth of a worm hole. Gravitational field at the earth surface induces a space -time curvature with a curvature radius near one ligth year: Just the rigth geometry to suppress fluctuation with smaller wavelength. We have so all good reason to think ligth-year long wave can travel in worm holes in the near Earth environment. To record it would ask for an detector with the good wave band sensibility, an antenna made from superconductive material could be up the job. With ceramic superconductors, liquid nitrogen could be sufficient to run such a system. At first, the transmission capability seems low: At most one bit per year, but nonlinear process such soliton waves could expand this far beyond. Kip S. Thorne in the chapter 13 of this book: Black Hole and Time Warps (W. W. Norton and Company, 1994) has given nearly all the story. The use of Casimir effect in time machines comes from a Nature article, the curvature radius of space-time near earth was found in the Misner-Thorne-Wheeler book: "Gravitation" (W. H. Freeman, 1973). Yvan Bozzonetti. Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=3365