what is the meaning of contact energy's Positive value and Negative value
5 months ago by
5 months ago by
Besides that, you always need to take into account all possible interactions. So even if a particular pair of cells has a j value of -10 and a large contact area (contact energy is J*contact_area) that contact could still be displaced if either of the two cells has a higher affinity (more negative J) for some other cell type and/or the other cell type is more flexible and can acquire a larger contact surface area.
So, in general, you need to take into account all possible pairs of interactions; for N cell types (and assuming Medium is one of those N types) there are N^2/2 + N/2 = (N/2)(N+1) possible interactions. For 3 cell types there are 6 interaction, for 4 cell types there are 10 interactions, ...
Beyond the J values the actual interaction energy will also be dependent on how stiff the surface of the cells is. With a very low LambdaSurface and/or large target surface area, cells can create extra surface in order to reap the reward of a large contact surface if that lowers contact energy.
Finally, you need to remember that movement of a CC3D configuration to a lower energy configuration can only occur if a suitable pathway exists. In other words, it is possible to trap a CC3D system in an energetically unfavorable state if there is no reasonably low energy pathway to a lower energy state. (That is also true of biology, biological systems are trapped in high energy states (life) since a low energy pathway to lower energy states (death) isn't always readily available.)
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