We consider the Super Yang–Mills/spin system map to construct the SU(2) spin bit model at the level of two loops in Yang–Mills perturbation theory. The model describes a spin system with chaining interaction. In the large N limit the model is shown to be reduced to the two loop planar integrable spin chain.

We present a model system in R3 for a spin-1 quantum entity. If the state of the model system corresponds to a ’|s| = 1’-state of a spin-1 quantum entity, it behaves as a joint system of two separated spin2 quantum entities. If it corresponds to a ’s = 0’-state of a spin-1 quantum entity, it behaves as the joint system of two spin2 quantum entities that are entangled by correlations of the seco...

Nuclear level densities and spin cut-off factors have been deduced for nuclei in the mass region 24‹A‹63,from a microscopic theory, which includes nuclear pairing interaction. Single particle levels for both Seeger and Nilsson potentials were used in the calcdations. Level densities extracted from the theory are compared with their conesponding experimental values, It is found that the overall...

A simple spin system is studied as an analog for proteins. We investigate how the introduction of randomness and frustration into the system affects the designability and stability of ground-state configurations. We observe that the spin system exhibits proteinlike behavior in the vicinity of the transition between a ferromagnet and a spin glass. Our results illuminate some guiding principles i...