Matching Lagrangian and Hamiltonian Simulations in (2+1)-dimensional U(1) Gauge Theory

Groß, C.F.; Romiti, S.; Funcke, L.; Jansen, K.; Kan, A.; Kühn, S.; Urbach, C.

Matching Lagrangian and Hamiltonian Simulations in (2+1)-dimensional U(1) Gauge Theory

C.F. Groß
(
- Bonn U., HISKP and
- U. Bonn, Phys. Inst., BCTP
)
,
S. Romiti
(
- Bern U. and
- U. Bern, AEC
)
,
L. Funcke
(
- Bonn U., HISKP and
- U. Bonn, Phys. Inst., BCTP
)
,
K. Jansen
(
- Cyprus Inst. and
- DESY, Zeuthen
)
,
A. Kan
(
- Waterloo U.
)

Mar 14, 2025

26 pages

e-Print:

2503.11480 [hep-lat]

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Abstract: (arXiv)

At finite lattice spacing, Lagrangian and Hamiltonian predictions differ due to discretization effects. In the Hamiltonian limit, i.e. at vanishing temporal lattice spacing

a_t

, the path integral approach in the Lagrangian formalism reproduces the results of the Hamiltonian theory. In this work, we numerically calculate the Hamiltonian limit of a U

(1)

gauge theory in

(2+1)

dimensions. This is achieved by Monte Carlo simulations in the Lagrangian formalism with lattices that are anisotropic in the time direction. For each ensemble, we determine the ratio between the temporal and spatial scale with the static quark potential and extrapolate to

a_t \to 0

. Our results are compared with the data from Hamiltonian simulations at small volumes, showing agreement within

<2\sigma

. These results can be used to match the two formalisms.

Note:

11 figures, 9 tables

References(42)

Figures(10)

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