Euclidean wormholes in Gauss-Bonnet-dilaton gravity

Understand

We investigate Euclidean wormholes in Gauss-Bonnet-dilaton gravity to explain the creation of the universe from nothing.

• We considered two types of dilaton couplings (i.e., the string-inspired model and the Gaussian model) and we obtained qualitatively similar results.
• There can exist Euclidean wormholes that explain the possible origin of our universe, where the dilaton field is located over the barrier of dilaton potential.
• This solution can exist even if dilaton potential does not satisfy slow-roll conditions.