Entropy variations and light ray operators from replica defects
Abstract
We study the defect operator product expansion (OPE) of displacement operators in free and interacting conformal field theories using replica methods. We show that as n approaches 1 a contact term can emerge when the OPE contains defect operators of twist d - 2. For interacting theories and general states we give evidence that the only possibility is from the defect operator that becomes the stress tensor in the n → 1 limit. This implies that the quantum null energy condition (QNEC) is always saturated for CFTs with a twist gap. As a check, we show independently that in a large class of near vacuum states, the second variation of the entanglement entropy is given by a simple correlation function of averaged null energy operators as studied by Hofman and Maldacena. This suggests that sub-leading terms in the defect OPE are controlled by a defect version of the spin-3 non-local light ray operator and we speculate about the possible origin of such a defect operator. For free theories this contribution condenses to a contact term that leads to violations of QNEC saturation.
- Authors:
-
- University of Illinois at Urbana-Champaign, IL (United States)
- University of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); US Department of Defense (USDOD)
- OSTI Identifier:
- 1976547
- Grant/Contract Number:
- SC0019183; SC0019380; AC02-05CH11231; PHY-1820912; Department of Defense (DoD)
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2022; Journal Issue: 9; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; boundary quantum field theory; conformal field theory; field theories in higher dimensions
Citation Formats
Balakrishnan, Srivatsan, Chandrasekaran, Venkatesa, Faulkner, Thomas, Levine, Adam, and Shahbazi-Moghaddam, Arvin. Entropy variations and light ray operators from replica defects. United States: N. p., 2022.
Web. doi:10.1007/jhep09(2022)217.
Balakrishnan, Srivatsan, Chandrasekaran, Venkatesa, Faulkner, Thomas, Levine, Adam, & Shahbazi-Moghaddam, Arvin. Entropy variations and light ray operators from replica defects. United States. https://doi.org/10.1007/jhep09(2022)217
Balakrishnan, Srivatsan, Chandrasekaran, Venkatesa, Faulkner, Thomas, Levine, Adam, and Shahbazi-Moghaddam, Arvin. Mon .
"Entropy variations and light ray operators from replica defects". United States. https://doi.org/10.1007/jhep09(2022)217. https://www.osti.gov/servlets/purl/1976547.
@article{osti_1976547,
title = {Entropy variations and light ray operators from replica defects},
author = {Balakrishnan, Srivatsan and Chandrasekaran, Venkatesa and Faulkner, Thomas and Levine, Adam and Shahbazi-Moghaddam, Arvin},
abstractNote = {We study the defect operator product expansion (OPE) of displacement operators in free and interacting conformal field theories using replica methods. We show that as n approaches 1 a contact term can emerge when the OPE contains defect operators of twist d - 2. For interacting theories and general states we give evidence that the only possibility is from the defect operator that becomes the stress tensor in the n → 1 limit. This implies that the quantum null energy condition (QNEC) is always saturated for CFTs with a twist gap. As a check, we show independently that in a large class of near vacuum states, the second variation of the entanglement entropy is given by a simple correlation function of averaged null energy operators as studied by Hofman and Maldacena. This suggests that sub-leading terms in the defect OPE are controlled by a defect version of the spin-3 non-local light ray operator and we speculate about the possible origin of such a defect operator. For free theories this contribution condenses to a contact term that leads to violations of QNEC saturation.},
doi = {10.1007/jhep09(2022)217},
journal = {Journal of High Energy Physics (Online)},
number = 9,
volume = 2022,
place = {United States},
year = {Mon Sep 26 00:00:00 EDT 2022},
month = {Mon Sep 26 00:00:00 EDT 2022}
}
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