Asymptotically flat (1,m,n) superstrata: a farewell to AdS

Superstrata microstate geometries furnish some of the most successful laboratories, to date, for probing black hole microstructure in a geometric setting. This paper extends the (1,m,n) family of superstrata, to allow for flat asymptotics. Previous constructions utilized the decoupling regime, where the geometry is asymptotically AdS3xS3. Brief comments are made on the additional complexity introduced by the flat space coupling, how this obscures holomorphicity and breaks the consistent truncation to which the decoupled solutions belong. Holomorphicity and consistent truncation were key simplifications assisting previous studies of the (1,m,n) superstrata, undertaken in the decoupling regime. Further, these results open a window for future projects to determine how previous analysis on the decoupled geometries extend or are modified once flat space asymptotics are imposed. Since our universe is almost flat on cosmological scales, this represents progress towards more phenomenologically relevant microstate geometries. This work can be considered a continuation of that in arxiv.org/abs/1711.10474 where some single mode superstrata were also coupled to flat space.