Instantons and wormholes in Minkowski and (A)dS spaces

TL;DR: In this paper, the weak gravity conjecture was investigated under toroidal compactification and RG flows, finding evidence that WGC bounds for single photons become weaker in the infrared and a superextremal particle should exist for every charge in the charge lattice.

TL;DR: In this paper, the authors consider the problem of constructing a geodesic with the minimal number of free parameters such that all other geodesics are generated through isometrics, and give an intrinsic characterization of this solution in a wide class of orbits for various supergravities in different dimensions.

TL;DR: In particular, wormholes are expected to break the shift symmetries of axions or Goldstone bosons non-perturbatively as discussed by the authors, which can be relevant to large-field inflation and connects to arguments made on the basis of the Weak Gravity or Swampland conjectures.

TL;DR: In particular, wormholes are expected to break the shift symmetries of axions or Goldstone bosons non-perturbatively as discussed by the authors, which can be relevant to large-field inflation and connects to arguments made on the basis of the Weak Gravity or Swampland conjectures.

TL;DR: In this article, it was shown that wormholes can have the effect of making the cosmological constant vanish, and that wormhole topology changing configurations in euclidean quantum gravity have been advocated by several authors.

TL;DR: The topological fluctuations recently suggested by Hawking, by Giddings and Strominger, and by Lavrelashvili, Rubakov, and Tinyakov do not lead to an observable loss of quantum coherence as discussed by the authors.

TL;DR: In this paper, the wave function of an interacting family of one large parent and many Planck-sized "baby" universes is computed in a semiclassical approximation using an adaptation of Hartle-Hawking initial conditions.

TL;DR: In this article, instantons are found which describe the nucleation of a Planck-sized baby Robertson-Walker universe and an estimate of the magnitude of this effect on particle propagation is made in the semi-classical approximation.