In this paper we explore the entanglement of two relativistic spin-1/2 particles with continuous momenta. The spin state is described by the Bell state and the momenta are given by Gaussian distributions of product form. Transformations of the spins are systematically investigated in different boost scenarios by calculating the orbits and concurrence of the spin degree of freedom. By visualizing the behavior of the spin state we get further insight into how and why the entanglement changes in different boost situations. *
The field-dependent invariant representation (the "dynamical" representation) of the Poincaré algebra is considered as a dynamical principle in order to get the corresponding "dynamical" electromagnetic coupling for higher spins (s ≥ 1). If in lower-spin (s = 0, 1/2) cases the "dynamical" coupling is taken to coincide with the minimal electromagnetic coupling the higher-spin coupling is inevitably non-minimal, containing a term linear in the field strength tensor F µν . This term leads to g = 2.
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