Discussion Overview
The discussion revolves around the existence of solutions to the Einstein Field Equations (EFE) that support Closed Timelike Curves (CTCs). Participants explore various spacetime geometries and their implications for the possibility of CTCs, including theoretical models and their physical plausibility.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- Some participants propose that there are EFE solutions, such as Gödel spacetime, that admit CTCs.
- Others mention that many EFE solutions violate energy conditions, including the interior of a Kerr black hole and the Tipler cylinder, as potential examples supporting CTCs.
- A participant questions whether Gödel's spacetime allows for CTCs without regions of infinite curvature or black holes.
- Another participant clarifies that Gödel's original solution does not contain black holes, but other Kerr-Gödel-type solutions may include them.
- There is a query about the plausibility of Gödel or Kerr-Gödel-type solutions as models for our Universe.
- One participant expresses a strong skepticism regarding the acceptance of CTCs in standard physics, suggesting that they are not considered plausible by most physicists.
- A later reply asserts that, according to current standard physics, there is no way to achieve a CTC journey or reach distant regions of spacetime via a wormhole.
Areas of Agreement / Disagreement
Participants express differing views on the plausibility of CTCs in the context of current physics, with some supporting the existence of theoretical models and others rejecting their feasibility in the real Universe.
Contextual Notes
Discussion includes references to specific solutions and their properties, but does not resolve the implications of energy conditions or the physical reality of CTCs.