Reduction Process of Gypsum with Polyethylene at High Temperature

Dimensional Reduction at High Temperature for Fermions

The concept of dimensional reduction in the high temperature regime is generalized to static Green’s functions of composite operators that contain fermionic fields. The recognition of a natural kinematic region where the lowest Matsubara modes are close to their mass-shell, and the ultraviolet behavior of the running coupling constant of the original theory are crucial for providing the necessa...

Limitations to Dimensional Reduction at High Temperature

The claim that renormalizable four-dimensional field theories in the infinite-temperature limit undergo a reduction to effective three-dimensional ones is analyzed in perturbation theory. An essential ingredient is the finite-temperature renormalization group in the imagina~'-time formalism. A precise criterion for the occurrence of complete dimensional reduction is given. This is satisfied onl...

Dimensional Reduction at High Temperature Revisited

We give a perturbative analysis of dimensional reduction in the infinite-temperature limit of thermal field theory in the imaginary time formalism. In analogy with the ordinary (Appelquist-Carazzone) decoupling theorem, we seek a class of renormaliza-tion schemes in which the heavy (non-static) modes decouple. This class turns out to consist of temperature-dependent schemes, so that the appropr...

High-Temperature X-Ray Powder Diffraction of Secondary Gypsum

Reduction of Silicates at High Temperature: Fulgurites and Thermodynamic

Introduction: The high temperature processing of silicates often results in very reduced products, such as Si-bearing Fe metal in type-1 chondrules [1] and in lunar regolith agglutinates [2]. Previous work on fulgurites (the glassy products of the lightning strike fusion of sand, soil, or rock) found silicon metal and ironsilicon alloys inside the silicate glass [3, 4]. In this work, we present...