Comments on the nilpotent constraint of the goldstino superfield

Superfield constraints were often used in the past, in particular, to describe the Akulov–Volkov action of the goldstino by a superfield formulation with [Formula: see text] endowed with the nilpotent constraint [Formula: see text] for the goldstino superfield ([Formula: see text]). Inspired by this, such constraint is often used to define the goldstino superfield even in the presence of additional superfields, for example, in models of “nilpotent inflation”. In this review, we show that the nilpotent property is not valid, in general, under the assumption of a microscopic (ultraviolet (UV)) description of the theory with linear supermultiplets. Sometimes only weaker versions of the nilpotent relation are true such as [Formula: see text] or [Formula: see text] ([Formula: see text]) in the infrared (far below the UV scale) under the further requirement of decoupling all additional scalars (coupling to sgoldstino), something not always possible (e.g. if light scalars exist). In such cases, the weaker nilpotent property is not specific to the goldstino superfield anymore. We review the restrictions for the Kahler curvature tensor and superpotential [Formula: see text] under which [Formula: see text] remains true in infrared, assuming linear supermultiplets in the microscopic description. One can reverse the arguments to demand that the nilpotent condition, initially an infrared property, be extended even in the presence of additional superfields, but this may question the nature of supersymmetry breaking or the existence of a perturbative UV description with linear supermultiplets.

Processing of High-Quartz Porcelain Tile with Large Yellow Sand

In this study, the yellow sand waste with enormous reserves in the Inner Mongolia Tengger desert was taken as the main raw material mixed with the same regional clays for the infrared functional low-temperature porcelained tile. The mineral composition and granule feature of Tengri yellow sand as well as the micro-structure and infrared property of the fired body were discussed by the means of various testing such as the grain fineness distribution analysis, the XRD diffraction analysis, the SEM scanning electron microscope analysis, the coefficient of thermal expansion measure and the infrared performance detection. The results revealed that the natural mineral could be replaced by the yellow sand waste in large for preparing the environmental protection functional porcelained ceramics with favorable properties. The flexural strength of porcelained tiles sintered at 1140°C~1160°Ckeeps from 40 to 55Mpa when the high addition of yellow sand varies 75wt% to 90wt%. And the body is composed of high quartz as the main phase and little wollastonite phase which meets with the thermal shock resistant standard of the present architectural material .

Study on the Infrared Property and the Structure of Schorl Calcined at the High Temperature

The iron-rich schorl was took as the research objects in this paper and the high temperature phases transformation of the schorl were discussed. The preparation and infrared properties of the schorl glaze, of what is the melting temperature lower than 800°Cwere studied and also the law of improving water quality by the schorl glaze were tested and analyzed. The results showed that the schorl can be decomposed into mullite and iron oxide when the temperature higher than 800°C; the far-infrared emissivity of the glaze prepared by the schorl mixed with more than 40wt% low temperature frit reached 0.885; the property of schorl glaze is weaker than the material supported on porous ceramics modified by schorl in improving water quality (pH value).