Is it possible to create a universe in the laboratory by quantum tunneling?
Abstract
We explore the possibility that a new universe can be created by producing a small bubble of false vacuum. The initial bubble is small enough to be produced without an initial singularity, but classically it could not become a universe  instead it would reach a maximum radius and then collapse. We investigate the possibility that quantum effects allow the bubble to tunnel into a larger bubble, of the same mass, which would then classically evolve to become a new universe. The calculation of the tunneling amplitude is attempted, in lowest order semiclassical approximation (in the thinwall limit), using both a canonical and a functional integral approach. The canonical approach is found to have flaws, attributable to our method of spacetime slicing. The functional integral approach leads to a euclidean interpolating solution that is not a manifold. To describe it, we define an object which we call a ``pseudomanifold'', and give a prescription to define its action. We conjecture that the tunneling probability to produce a new universe can be approximated using this action, and we show that this leads to a plausible result.
 Publication:

Nuclear Physics B
 Pub Date:
 July 1990
 DOI:
 10.1016/05503213(90)90357J
 Bibcode:
 1990NuPhB.339..417F
 Keywords:

 Bubbles;
 Cosmology;
 Manifolds (Mathematics);
 Quantum Theory;
 Trajectory Analysis;
 Vacuum;
 Hamiltonian Functions;
 Scalars;
 Schwarzschild Metric;
 Singularity (Mathematics);
 Physics (General)