Microlensing by natural wormholes: theory and simulations
We provide an in depth study of the theoretical peculiarities that arise in effective negative mass lensing
(Negative mass and the exotic particles that might represent it is another story)
The negative mass article of wikipedia,
Currently, the closest known real representative of such exotic matter is a region of negative pressure density produced by the Casimir effect.
AFAIK wormholes are shortcuts
A wormhole can be visualized as a tunnel with two ends at separate points in spacetime (i.e., different locations, different points in time, or both). "
This gave me the idea for experiments with a particle beam that would show if the negative energy density mathematically seen in the Casimir effect could lead to a wormhole.
The idea is simple:
A high momentum particle beam from an accelerator passing through the space of the parallel plates has a probability to interact with the virtual photons of the Casimir field between the plates, which is calculable. Counting the beam tracks going through without interacting would show a discrepancy with the calculations if the negative energy density acts as a worm hole and part of the beam ends elsewhere instead of going through. It is a difficult experiment because the path of the particle should be coming within a nanometer accuracy to be able to go between the two plates.
If the above is possible experimentally, but the errors in the calculations are too large, two Casimir sets can be used as in this picture,
The detectors should be around the Casimir sets , in order to detect interactions between the plates and record their frequency. The barrier should be of absorbent material able to absorb any beam particle that hits it.
Comparing data without the impenetrable barrier , and then with the barrier in place would be proof of a wormhole existing if the second setup had a distribution of hits above the background with no beam.
Of course the relative location of the Casimir setups could be different in the extra dimension, so no signal would not mean no wormhole.
NASA has advanced a lot in Casimir effect technology, see here , and maybe they could evaluate the feasibility of such an experiment.