Static Tree Research Articles

Film resistivity and its relationship to static tree formation on 105mm roll film.

ABSTRACTStatic tree formation on roll film is a phenomenon not infrequently found in the radiology department. In this paper an attempt has been made to quantify this phenomenon by measuring the physical film parameter resistivity for four brands of roll film.A strong correlation between high resistivity and observed static tree formation is seen. Further, a survey of 20 radiology centres in the eastern and southern states of Australia using 105mm roll film revealed that film type was a significant factor in static tree formation, whereas camera type was not.

Alteration of the ground state by external magnetic fields: The Abelian Higgs model

By fully exploiting the mathematical and physical analogy to the Ginzburg-Landau theory of superconductivity, we present a complete discussion of the ground state behavior of the four-dimensional Abelian Higgs model in the static tree level approximation. We show that a sufficiently strong external magnetic field can alter the ground state of the theory by restoring a spontaneously broken symmetry, or by creating a qualitatively different “vortex” state. The energetically favored ground state is explicitly determined as a function of the external field and the ratio between coupling constants of the theory.