fermiqcd_gauge_algorithms.h File Reference

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Functions
void	set_cold (gauge_field &U)
	make a cold gauge configuration
void	set_hot (gauge_field &U)
	Make a hot gauge configuration.
void	check_unitarity (gauge_field &U, double precision=PRECISION)
	Check that gauge field is unitary within precision.
mdp_real	average_plaquette (gauge_field &U, int mu, int nu)
	Compute average plaquette on plane mu-nu.
mdp_real	average_plaquette (gauge_field &U)
	Compute average plaquette (all planes).
void	compute_em_field (gauge_field &U)
	Given a field U compute the chromo-eletro-magntic field U.em.
void	compute_long_links (gauge_field &U, gauge_field &V, int length=2)
void	set_antiperiodic_phases (gauge_field &U, int mu=0, int check=TRUE)
mdp_matrix	project_SU (mdp_matrix M, int nstep=1)
mdp_complex	average_path (gauge_field &U, int length, int d[][2])
mdp_matrix	build_path (gauge_field &U, site x, int length, int d[][2])
void	copy_path (int length, int d[][2], int c[][2])
void	invert_path (int mu, int length, int d[][2])
void	rotate_path (int angle, int mu, int nu, int length, int d[][2])

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Detailed Description

Version:

3-1-2005

Author:

Massimo Di Pierro <mdipierro@cs.depaul.edu>

Various stuff for gauge field

This file is copyrighted by Massimo Di Pierro Read attached license in file fermiqcd_license.pdf This file cannot be distributed without file fermiqcd_license.pdf

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Function Documentation

mdp_complex average_path (  gauge_field &  U, int  length, int  d[][2] )

Takes a field U and path d of length and compute the average of the path on the entire lattice. Assumes computation can be done locally for each site Example: int mu=0, nu=1; gauge_field U(lattice,nc); int d[][2]={{+1,mu},{+1,nu},{-1,mu},{-1,nu}} mdp << "plaquette=" << average_path(U,4,d) << endl;

mdp_matrix build_path (  gauge_field &  U, site  x, int  length, int  d[][2] )

Takes a field U, a site x, a path d of length and compute the product of links along the path starting at x. Assumes computation can be done locally for each site Example: int mu=0, nu=1; gauge_field U(lattice,nc); int d[][2]={{+1,mu},{+1,nu},{-1,mu},{-1,nu}} forallsites(x) cout << "plaquette(x)=" << average_path(U,x,4,d) << endl;

void compute_long_links (  gauge_field &  U, gauge_field &  V, int  length = 2 )

For use with asqtad staggered action Given field V makes a field U.long_links where (if length==2) U.long_links(x,mu)=V(x,mu)*V(x+mu,mu); or (if length==3) U.long_links(x,mu)=V(x,mu)*V(x+mu,mu)*V((x+mu)+mu,mu);

mdp_matrix project_SU (  mdp_matrix  M, int  nstep = 1 )

takes a matrix M, performs a Cabibbo-Marinari cooling and returns the projected matrix

void set_antiperiodic_phases (  gauge_field &  U, int  mu = 0, int  check = TRUE )

To set antiperiodic boundary conditions on in direction mu gauge_field U(lattice,nc); // do heatbath on U set_antiperiodic_phases(U,mu,TRUE); // use quarks (will have antiperiodic boundary conditions) set_antiperiodic_phases(U,mu,FALSE);

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