Journal
PHYSICAL REVIEW D
Volume 104, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.026012
Keywords
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Funding
- Fudan University
- Thousands Young Talents Program
- NSFC [11875111, 11922502]
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- Province of Ontario through the Ministry of Research, Innovation and Science
- Perimeter Institute for hospitality, EmmyNoether Fellowship programme
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In this work, we consider the question of local Hilbert space factorization in 2D conformal field theory. We interpret the factorization of CFT states in terms of path integral processes, with an entanglement boundary condition satisfied by the vacuum Ishibashi state leading to reduced density matrices and identification of CFT edge modes. The factorization map is related to the coproduct formula for the CFT symmetry algebra, equivalent to a Boguliubov transformation in the case of a free boson.
In this work, we consider the question of local Hilbert space factorization in 2D conformal field theory. Generalizing previous work on entanglement and open-closed TQFT, we interpret the factorization of CFT states in terms of path integral processes that split and join the Hilbert spaces of circles and intervals. More abstractly, these processes are cobordisms of an extended CFT which are defined purely in terms of the OPE data. In addition to the usual sewing axioms, we impose an entanglement boundary condition that is satisfied by the vacuum Ishibashi state. This choice of entanglement boundary state leads to reduced density matrices that sum over super-selection sectors, which we identify as the CFT edge modes. Finally, we relate our factorization map to the coproduct formula for the CFT symmetry algebra, which we show is equivalent to a Boguliubov transformation in the case of a free boson.
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