user warning: Unknown column 'sid' in 'where clause' query: SELECT * FROM flag_content WHERE content_type = 'node' AND content_id = 28 AND (uid = 0 OR uid = 0) AND sid = 0 in /home/dougsweetser/visualphysics.org/sites/all/modules/flag/flag.module on line 1536.

The Group SU(2), Weak Force Symmetry

Posted by doug
summary: 
The group of unitary quaternions is the symmetry underlying the weak force of radioactive decay. Who would have thought the symmetry looks like this?
description: 
If one takes the vector part of a quaternion and takes the exponential, the norm is always equal to 1. The animation starts out at 8 points, those for exp(0, +/-1, +/-1, +/-1). These points grow into each other until they form a sphere. That sphere then shrinks to the point (1, 0, 0, 0), the furthest into the future the exponential can reach.
command: 
q_graph -dir vp -out group_SU2 -loop 0 -box 1.1 -command 'q_random_n_11 50000 | q_vector | q_exp'
youtube embed: 
equation: 

[tex]exp(A - A^*)\in SU(2)[/tex]



""