This repository is not being actively maintained and mainly exists for archiving purposes.
This is an MPI-powered parallel C-program for Monte Carlo simulations of statistical and quantum field theories with SU(2) gauge symmetry and Higgs fields in different representations. Particular focus is placed on studying first-order phase transitions with multicanonical sampling.
- SU(2) gauge fields with standard Wilson action
- Compact U(1) gauge fields
- SU(2) x U(1) fundamental Higgs
- SU(2) adjoint Higgs
- Real gauge singlet scalar
Simply run make in the repository root. The resulting binary will go to bin directory. By default we build a parallel MPI program (requires OpenMPI). A non-parallel, single-core program can be compiled with make SERIAL=1.
-D flags can be used to specify what field content and other features to include in simulations. See the Makefile for examples.
Compiles without warnings on GCC 9.4.0.
The program takes a configuration file as command line argument. This is where you can specify things like lattice size, input parameters to the lattice action (in a=1 units) and whether a multicanonical algorithm should be used. A sample config file is included in the repo.
Example run with 4 cores:
mpirun -np 4 bin/su2 config
The program computes volume averages (averages over all lattice sites) of local operators and stores them in plain text file 'measure' (name changeable in the config file). It also produces a 'labels' file containing column labels for the measurement file. Individual field configurations are only stored at infrequent checkpoints that store a snapshot of the lattice system in a binary file (default name: 'lattice').
For physics background see https://arxiv.org/abs/2405.01191 and references therein.
Scientific papers that utilize this code:
- Niemi et al, Phys.Rev.Lett. 126 (2021) 17, 171802 (arXiv: 2005.11332)
- Niemi et al, JHEP 02 (2023) 212 (arXiv: 2206.14487)
- Niemi et al, "Nonperturbative study of the electroweak phase transition in the real scalar singlet extended Standard Model", preprint (arXiv: 2405.01191)