Axion-Strings/default.param at main · SeanBryan51/Axion-Strings · GitHub

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% Default parameter file:

% Simulation parameters:

lambda              1.0             % Value of quartic coupling in PQ potential.
enable_PRS          1               % Use PRS equation of motion (0 : no, 1 : yes).
T_initial           4.0             % Initial temperature in units of f_a. Note: only need to set T_initial to
                                    % some value greater than sqrt(3) to simulate the PQ phase transition.
NDIMS               2               % Number of dimensions (2 or 3).
N                   128             % Number of grid points.
space_step          1.0             % Space step in dimensionless program units (default space_step=1).
time_step           0.3             % Time step in dimensionless program units (default 1/3 * space_step).
stencil_setting     0               % 0 : 3 points, 1 : 5 points, 2 : 7 points, 3 : 9 points.
seed                1998            % Seed used for random initial conditions.

% Output settings:

write_output_file   0               % 0 : write output to stdout, 1 : write output to text file specified by output_file_path.
output_file_path    /Users/seanbryan/Documents/UNI/2021T1-2/Project/Axion-Strings/output_files/output.txt

% Snapshots:

save_snapshots      0               % Save snapshots (0 : no, 1 : yes).
n_snapshots         5               % Number of snapshots.
output_directory    /Users/seanbryan/Documents/UNI/2021T1-2/Project/Axion-Strings/output_files % Path to output directory.

save_fields         0               % Save snapshot of fields (phi1, phi2) (0 : no, 1 : yes).
save_strings        0               % Save snapshot of string plaquettes (0 : no, 1 : yes).
save_pk             0               % Save snapshot of power spectrum (0 : no, 1 : yes).

% Time-series data:

sample_time_series  0               % Output time series data to file specified by ts_output_path (0 : no, 1 : yes).
n_samples           40              % Number of samples in time series.
ts_output_path      /Users/seanbryan/Documents/UNI/2021T1-2/Project/Axion-Strings/output_files/time-series.csv

sample_strings      0               % Output scaling parameter Xi (string scaling law) (0 : no, 1 : yes).
sample_background   0               % Output background field values (phi1, phi2, phidot1, phidot2, axion, saxion) (0 : no, 1 : yes).

% String finding settings:

thr                 1

% AMR settings:

enable_amr           0               % Enable adaptive mesh refinement (0 : no, 1 : yes)
init_from_snapshot   0               % Read initial conditions from snapshot. For now, manually store ic file paths in amr_run.cpp.
tau_initial          1.0             % Appropriate tau value for initial conditions.
refinement_threshold 20.0            % Threshold used in refinement criterion.