A substrate for brane shells from T T ¯
Abstract
A solvable currentcurrent deformation of the worldsheet theory of strings on AdS_{3} has been recently conjectured to be dual to an irrelevant deformation of the spacetime orbifold CFT, commonly referred to as singletrace T T ¯. These deformations give rise to a family of bulk geometries which realize a nontrivial flow towards the UV. For a particular sign of this deformation, the corresponding threedimensional geometry approaches AdS_{3} in the interior, but has a curvature singularity at finite radius, beyond which there are closed timelike curves. It has been suggested that this singularity is due to the presence of "negative branes," which are exotic objects that generically change the metric signature. We propose an alternative UVcompletion for geometries displaying a similar singular behavior by cutting and gluing to a regular background which approaches a linear dilaton vacuum in the UV. In the Sdual picture, a singularity resolution mechanism known as the enhançon induces this transition by the formation of a shell of D5branes at a fixed radial position near the singularity. The solutions involving negative branes gain a new interpretation in this context.
 Publication:

Journal of High Energy Physics
 Pub Date:
 May 2021
 DOI:
 10.1007/JHEP05(2021)248
 arXiv:
 arXiv:2012.09802
 Bibcode:
 2021JHEP...05..248A
 Keywords:

 Dbranes;
 pbranes;
 Spacetime Singularities;
 Superstring Vacua;
 High Energy Physics  Theory
 EPrint:
 38 pages, 1 figure. Added references