Casimir effect and a finite length Tipler cylinder? - Physics Forums
Feb 1, 2010 · In summary: Casimir effect in general relativity and quantum mechanics.In summary, the Casimir effect may offer potential for constructing a finite length Tipler cylinder for CTCs, but there are many technical and theoretical challenges that need to be addressed before its feasibility can be determined.
Tipler Cylinders: Solving for Light Cone Tilt Angle - Physics Forums
Sep 15, 2010 · Tipler Cylinders are theoretical objects proposed by physicist Frank Tipler in 1974. They are long, infinitely thin cylinders that are rotating around their longitudinal axis at near light-speed. These cylinders are believed to have the ability to create closed timelike curves (CTCs) which would allow for time travel.
Unravelling the Mysteries of the Kerr Black Hole Ergosphere
Dec 19, 2020 · For the van Stockum cylinder, AFAIK CTCs are only known to exist if the cylinder is infinite. The thesis mentions that Tipler conjectured that a finite cylinder with sufficient rotation would also cause CTCs in the exterior vacuum around it, …
Special & General Relativity: CTC Metrics in Cylindrical Coordinates
Apr 12, 2023 · The point is that cylinder admits a flat metric, so when we say that the metric is flat, we have not excluded a possibility that it is a cylinder. Yes thanks, the Tipler cylinder metric does reduce to the Minkowski line element in cylindrical coordinates when the angular velocity is 0.
Time travel is a fact or fiction.? - Physics Forums
Sep 7, 2021 · This could cause a spaceship that was going around the cylinder to be trapped in a closed-time loop thus resulting in time travel. This time machine, proposed by Tipler, unfortunately comes with one major flaw- as suggested in the name- an infinitely long tube is needed.
Time Travel, General Relativity & Information Paradoxes - Physics …
Nov 23, 2022 · In summary: The Tipler cylinderIn summary, general relativity permits some exact solutions that allow for time travel. Some of these exact solutions describe universes that contain closed timlike curves, or world lines that lead back to the same point in spacetime.
Cylindrical Surface Charge Density - Physics Forums
Jul 14, 2010 · What is the surface charge density inside the hollow cylinder? Answer in units of nC/m^2. Knowns: Central solid conducting cylinder of radius 0.013 m and charge 6 nC/m. Inner radius of cylindrical shell = 0.0475 m Outer radius of cylindrical shell = 0.067 m Charge of shell = 0 nC/m Qenc = Q1 + Qin Homework Equations (sigma) = Q/A A=2(pi)rL Flux ...
What Are Closed Timelike Curves in Black Holes? - Physics Forums
Jul 23, 2014 · the Tipler cylinder (a cylindrically symmetric metric with CTCs) Bonnor Steadman solutions describing laboratory situations such as two spinning balls J. Richard Gott has proposed a mechanism for creating CTCs using cosmic strings. * This entry is from our old Library feature.
Time Travel Yeah I know maybe some parallel universe talk too
Jun 10, 2006 · Tipler's paper was groundbreaking at the time, but it inspired further research to show that it won't work, at least with a finite cylinder. (Note that the math in Tipler's paper was for an infinite cylinder, as that case was easier to analyze). Specifically, as Steve Carlip says:
Time Travel in Special Relativity - Physics Forums
Dec 12, 2008 · There is also the Tipler cylinder, a solution of GR which requires a massive rotating cylinder of infinite length and thus cannot actually be constructed by any finite collection of beings (although maybe it could be constructed in a universe that didn't already contain it if an infinite set of beings at regular intervals all coincidentally ...