String theory

What do you propose?

In the basic formulation, the particles correspond to different modes of vibration of microscopic strings. One of these modes behaves like the graviton, making the theory a candidate for describing gravity quantumly. Mathematical consistency introduces additional dimensions and extended objects called branes.

Time, causality and extreme geometries

The theory allows us to study black holes, spaces with compact dimensions and correspondences between gravity and quantum theories. In these laboratories, questions about information, horizons and causality appear. However, There is no string theory recipe for making a time machine..

Many classical solutions with closed time curves turn out to be unstable, incompatible with global conditions or excluded by requiring a complete quantum theory. This observation fuels the idea that a fundamental theory could contain a principle of chronological protection.

Extra dimensions are not doors

Just because a theory uses additional dimensions does not imply that we can move through them as through a room. In the usual models they are compactified to tiny scales or are part of a geometry that determines the observed constants. Turning them into a macroscopic shortcut requires additional hypotheses.

Your real contribution to the debate

It forces us to ask what solutions of relativity survive when incorporating quantum degrees of freedom. Time travel thus ceases to be just a geometric problem and becomes a consistency test for the quantum gravity.