I am sorry for not having added the details initially , This is my first Question on physics stack Exchange.
This thing croped up in my mind from the ideas of fermi holes and fermi heaps, The basic thing is that two non interacting opposite spin particles connot occupy the same state. Now ,In the coordinate space, I think this means that they cannot occupy the same position.But what can we assume the effective distance which they have to mantain to see themselves as "not in same position". Now if there is such a effective distance then would that mean we have essentially a potential for the spin interaction.
Also, Maybe I am terribely wrong but , isnt the justrow factor in computational physics their to compensate for such an interaction??