Renyi entropy for local quenches in 2D CFT from numerical conformal blocks
Abstract
We study the time evolution of Renyi entanglement entropy for locally excited states in two dimensional large central charge CFTs. It generically shows a logarithmical growth and we compute the coefficient of log t term. Our analysis covers the entire parameter regions with respect to the replica number n and the conformal dimension h _{ O } of the primary operator which creates the excitation. We numerically analyse relevant vacuum conformal blocks by using Zamolodchikov's recursion relation. We find that the behavior of the conformal blocks in two dimensional CFTs with a central charge c, drastically changes when the dimensions of external primary states reach the value c/32. In particular, when h _{ O } ≥ c/32 and n ≥ 2, we find a new universal formula Δ {S}_A^{(n)}∼eq nc/24(n1) log t. Our numerical results also confirm existing analytical results using the HHLL approximation.
 Publication:

Journal of High Energy Physics
 Pub Date:
 January 2018
 DOI:
 10.1007/JHEP01(2018)115
 arXiv:
 arXiv:1711.09913
 Bibcode:
 2018JHEP...01..115K
 Keywords:

 AdSCFT Correspondence;
 Conformal Field Theory;
 Field Theories in Lower Dimensions;
 High Energy Physics  Theory;
 Condensed Matter  Statistical Mechanics;
 Condensed Matter  Strongly Correlated Electrons;
 Quantum Physics
 EPrint:
 24 pages, 8 figures