Janus within Janus

We found a simple and interesting generalization of the non-supersymmetric Janus solution in type IIB string theory. The Janus solution can be thought of as a thick AdSd-sliced domain wall in AdSd+1 space. It turns out that the AdSd-sliced domain wall can support its own AdSd−1-sliced domain wall within it. Indeed this pattern persists further until it reaches the AdS2-slice of the domain wall within self-similar AdSp (2<p≤d)-sliced domain walls. In other words the solution represents a sequence of little Janus nested in the interface of the parent Janus according to a remarkably simple “nesting” rule. Via the AdS/CFT duality, the dual gauge theory description is in general an interface CFT of higher codimensions.