JPF has been talking quite a bit about time travel, DARPA stating they intend to be warp capable within the century. Here is another investigation of that capability
We point out that there can be humanly traversable wormhole solutions in some previously considered theories for physics beyond the Standard Model, namely the Randall-Sundrum model.
PDF in the link [2008.06618] Humanly traversable wormholes
more FTA:
Traversable wormholes are a staple of the science fiction literature. In classical general relativity, they are forbidden by the average null energy condition [1, 2, 3]. Interestingly, they are allowed in the quantum theory, but with one catch, the time it takes to go through the wormhole should be longer than the time it takes to travel between the two mouths on the outsidea. Nevertheless they are interesting configurations that are allowed by the laws of physics as we know them. In fact, based on the initial construction in [5], four dimensional traversable wormholes were constructed in [6], see also [7, 8]. The construction in [6] involved ingredients that are present in the Standard Model, but only at short distances. Therefore only microscopic wormholes were found.
In this paper, we revisit the question and we engage in some “science fiction”. Namely, we will introduce a dark sector with desirable properties for constructing macroscopic traversable wormholes. This dark sector only interacts via gravity with the Standard Model
Humanly traversable wormholes.
Our main point is to emphasize the consistency of such wormholes with the laws of physics as we presently know them, using only previous ideas for physics beyond the Standard Model. In particular, we will use a version of the Randall-Sundrum model [9].
Our construction needs a dark