# Creating a Traversable Wormhole

## TL;DR

This paper proposes a nonperturbative quantum gravity process to nucleate traversable wormholes by creating black holes with identified horizons, potentially making wormholes traversable through quantum back-reaction effects.

## Contribution

It introduces a novel mechanism for wormhole nucleation involving instantons and black hole creation with horizons identified, differing from previous models.

## Key findings

- Black holes can be nucleated with horizons identified, forming wormholes.
- Quantum back-reaction can render these wormholes traversable.
- The black holes remain at rest, aiding traversability despite separation.

## Abstract

We argue that one can nucleate a traversable wormhole via a nonperturbative process in quantum gravity. To support this, we construct spacetimes in which there are instantons giving a finite probability for a test cosmic string to break and produce two particles on its ends. One should be able to replace the particles with small black holes with only small changes to the spacetime away from the horizons. The black holes are then created with their horizons identified, so this is an example of nucleating a wormhole. Unlike previous examples where the created black holes accelerate apart, in our case they remain essentially at rest. This is important since wormholes become harder and harder to make traversable as their mouths become widely separated, and since traversability can be destroyed by Unruh radiation. In our case, back-reaction from quantum fields can make the wormhole traversable.