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Title: Exploring 2-group global symmetries

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]
  1. Inst. for Advanced Study, Princeton, NJ (United States)
  2. Harvard Univ., Cambridge, MA (United States); Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States)

Here, we analyze four-dimensional quantum field theories with continuous 2-group global symmetries. At the level of their charges, such symmetries are identical to a product of continuous flavor or spacetime symmetries with a 1-form global symmetry U(1)B(1), which arises from a conserved 2-form current JB(2). Rather, 2-group symmetries are characterized by deformed current algebras, with quantized structure constants, which allow two flavor currents or stress tensors to fuse into JB(2). This leads to unconventional Ward identities, which constrain the allowed patterns of spontaneous 2-group symmetry breaking and other aspects of the renormalization group flow. If JB(2) is coupled to a 2-form background gauge field B(2), the 2-group current algebra modifies the behavior of B(2) under background gauge transformations. Its transformation rule takes the same form as in the Green-Schwarz mechanism, but only involves the background gauge or gravity fields that couple to the other 2-group currents. This makes it possible to partially cancel reducible ’t Hooft anomalies using Green-Schwarz counterterms for the 2-group background gauge fields. The parts that cannot be cancelled are reinterpreted as mixed, global anomalies involving U(1)B(1), which receive contributions from topological, as well as massless, degrees of freedom. Theories with 2-group symmetry are constructed by gauging an abelian flavor symmetry with suitable mixed ’t Hooft anomalies, which leads to many simple and explicit examples. Some of them have dynamical string excitations that carry U(1)B(1) charge, and 2-group symmetry determines certain ’t Hooft anomalies on the world sheets of these strings. Lastly, we point out that holographic theories with 2-group global symmetries have a bulk description in terms of dynamical gauge fields that participate in a conventional Green-Schwarz mechanism.

Research Organization:
Institute for Advanced Study, Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); John Templeton Foundation
Grant/Contract Number:
SC0009988; SC0009919; PHY-1719924; 52476
OSTI ID:
1598254
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 2; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 125 works
Citation information provided by
Web of Science

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Exceptional Chern-Simons-Matter dualities journal January 2019
Effective field theory of force-free electrodynamics journal May 2019
On 2-form gauge models of topological phases journal May 2019
Dihedral symmetry in S U ( N ) Yang-Mills theory journal October 2019
Notes on anomalies, elliptic curves and the BS-D conjecture journal December 2019
On 2-form gauge models of topological phases text January 2019
On gauging finite subgroups text January 2017
On 2-Group Global Symmetries and Their Anomalies text January 2018
Effective Field Theory of Force-Free Electrodynamics text January 2018
Emergent (anomalous) higher symmetries from topological orders and from dynamical electromagnetic field in condensed matter systems text January 2018
Exceptional Chern-Simons-Matter Dualities text January 2018
On 2-form gauge models of topological phases text January 2019
Anomalies in the Space of Coupling Constants and Their Dynamical Applications I text January 2019
Anomalies in the Space of Coupling Constants and Their Dynamical Applications II text January 2019