TL;DR
This paper computes the charged R'enyi entropy at large global charge in conformal field theories, revealing universal behavior and providing one of the first concrete entanglement calculations in strongly-coupled theories.
Contribution
It introduces a universal computation of charged R'enyi entropy at large charge for conformal field theories using effective field theory methods.
Findings
Universal behavior of charged R'enyi entropy across various CFTs
First concrete entanglement calculation in strongly-coupled theories
Validation of effective field theory at large global charge
Abstract
The charged (symmetry-resolved) vacuum R\'enyi entanglement entropy on a disk is computed in the limit of large U(1) global charge for any R\'enyi index. We show that it behaves universally for a broad class of conformal field theories including the O(2) Wilson-Fisher fixed-point, by using the effective field theory at large global charge. The result establishes one of the first concrete computations of entanglement quantities in strongly-coupled field theories.
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Taxonomy
TopicsQuantum many-body systems · Quantum Information and Cryptography · Algebraic structures and combinatorial models