Abstract
Holographic CFTs and holographic RG flows on space-time manifolds which are d-dimensional products of spheres are investigated. On the gravity side, this corresponds to Einstein-dilaton gravity on an asymptotically AdSd+1 geometry, foliated by a product of spheres. We focus on holographic theories on S2× S2, we show that the only regular five-dimensional bulk geometries have an IR endpoint where one of the sphere shrinks to zero size, while the other remains finite. In the Z2-symmetric limit, where the two spheres have the same UV radii, we show the existence of a infinite discrete set of regular solutions, satisfying an Efimov-like discrete scaling. The Z2-symmetric solution in which both spheres shrink to zero at the endpoint is singular, whereas the solution with lowest free energy is regular and breaks Z2 symmetry spontaneously. We explain this phenomenon analytically by identifying an unstable mode in the bulk around the would-be Z2-symmetric solution. The space of theories have two branches that are connected by a conifold transition in the bulk, which is regular and correspond to a quantum first order transition. Our results also imply that AdS5 does not admit a regular slicing by S2× S2.
Highlights
Quantum field theories are usually studied in flat background space-time
Holographic CFTs and holographic RG flows on space-time manifolds which are d-dimensional products of spheres are investigated
This corresponds to Einstein-dilaton gravity on an asymptotically AdSd+1 geometry, foliated by a product of spheres
Summary
Quantum field theories are usually studied in flat background space-time. We can consider them, in background space-times that have non-trivial curvature. Starting from a product of spheres can be useful to understand the phase structure of confining theories on curved manifolds Another interesting question from the perspective of generalized dimensional reduction/uplift is the origin of the discrete scaling discussed in this paper: here, we have identified an unstable mode underlying this phenomenon, but it would be interesting to rephrase it in terms of the more familiar language of scalar fields violating the BF bound at some IR fixed point, as it was the case in [30,31,32,33,34,35].
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