Fractional θ angle, ’t Hooft anomaly, and quantum instantons in charge-q multi-flavor Schwinger model
Journal Article
·
· Journal of High Energy Physics (Online)
- Akita Univ. (Japan); Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Keio Univ. (Japan); DOE/OSTI
- North Carolina State Univ., Raleigh, NC (United States)
This work examines non-perturbative dynamics of a 2-dimensional QFT by using discrete ’t Hooft anomaly, semi-classics with circle compactification and bosonization. We focus on charge-q N-flavor Schwinger model, and also Wess-Zumino-Witten model. We first apply the recent developments of discrete ’t Hooft anomaly matching to theories on R2 and its compactification to R× S1L. We then compare the ’t Hooft anomaly with dynamics of the models by explicitly constructing eigenstates and calculating physical quantities on the cylinder spacetime with periodic and flavor-twisted boundary conditions. We find different boundary conditions realize different anomalies. Especially under the twisted boundary conditions, there are Nq vacua associated with discrete chiral symmetry breaking. Chiral condensates for this case have fractional θ dependence eiθ/Nq, which provides the Nq-branch structure with soft fermion mass. We show that these behaviors at a small circumference cannot be explained by usual instantons but should be understood by “quantum” instantons, which saturate the BPS bound between classical action and quantum-induced effective potential. The effects of the quantum-instantons match the exact results obtained via bosonization within the region of applicability of semi-classics. We also argue that large-N limit of the Schwinger model with twisted boundary conditions satisfy volume independence.
- Research Organization:
- North Carolina State Univ., Raleigh, NC (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-03ER41260
- OSTI ID:
- 1609453
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2019; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Higher-form symmetries and 3-group in axion electrodynamics
|
journal | September 2020 |
Anomalies, a mod 2 index, and dynamics of 2d adjoint QCD
|
journal | January 2020 |
| Strongly coupled QFT dynamics via TQFT coupling | text | January 2020 |
| Semi-Abelian gauge theories, non-invertible symmetries, and string tensions beyond $N$-ality | text | January 2021 |
Self-conjugate QCD
|
journal | October 2019 |
Domain walls and deconfinement: a semiclassical picture of discrete anomaly inflow
|
journal | December 2019 |
Undoing decomposition
|
journal | December 2019 |
Similar Records
Semiclassics with ’t Hooft flux background for QCD with 2-index quarks
Polyakov model in ’t Hooft flux background: a quantum mechanical reduction with memory
Quantum distillation of Hilbert spaces, semi-classics and anomaly matching
Journal Article
·
Mon Aug 01 20:00:00 EDT 2022
· Journal of High Energy Physics (Online)
·
OSTI ID:1976503
Polyakov model in ’t Hooft flux background: a quantum mechanical reduction with memory
Journal Article
·
Mon Aug 08 20:00:00 EDT 2022
· Journal of High Energy Physics (Online)
·
OSTI ID:1976511
Quantum distillation of Hilbert spaces, semi-classics and anomaly matching
Journal Article
·
Mon Aug 13 20:00:00 EDT 2018
· Journal of High Energy Physics (Online)
·
OSTI ID:1507781