Abstract: 
Colemande Luccia processes for AdS to AdS decays in Einsteinscalar theories are studied. Such tunnelling processes are interpreted as vevdriven holographic RG flows of a quantum field theory on de Sitter spacetime. These flows do not exist for generic scalar potentials, which is the holographic formulation of the fact that gravity can act to stabilise false AdS vacua. The existence of Colemande Luccia tunnelling solutions in a potential with a false AdS vacuum is found to be tied to the existence of exotic RG flows in the same potential. Such flows are solutions where the flow skips possible fixed points or reverses direction in the coupling. This connection is employed to construct explicit potentials that admit Colemande Luccia instantons in AdS and to study the associated tunnelling solutions. Thinwalled instantons are observed to correspond to dual field theories with a parametrically large value of the dimension ∆ for the operator dual to the scalar field, casting doubt on the attainability of this regime in holography. From the boundary perspective, maximally symmetric instantons describe the probability of symmetry breaking of the dual QFT in de Sitter. It is argued that, even when such instantons exist, they do not imply an instability of the same theory on flat space or on R × S3^{3}3.
