Stationary Photons, A Gang Of Six

What are these (\(t_c\),\(x\),\(t_g\),\(t_T\)) and (\(t_g\),\(x\),\(t_c\),\(t_T\))?  They exist in the \(t_T\) time dimension.  Have a force field around them when stationary.  Exchange energy between a time dimension and space, like a photon. For that matter,

These are stationary photons, all six of them.