Theta Vacuum in Different Gauges

Theta Vacuum in Different Gauges

Theta vacuum in different gauges

In some recent papers it is claimed that the physical significance of the vacuum angle theta for QCD-like theories depends on the chosen gauge condition. We criticise the arguments that were given in support of this claim, and show by explicit construction for the case of QED 2 that and why they fail, confirming thereby the commonly accepted point of view.

XIX IMEKO World Congress

Vacuum technology is one of the established advanced technologies, of present age, in the field of research and industry. Having numerous applications, in the areas of human activities, one is concerned with a relatively large vacuum chamber where pressure distribution is, usually, not uniform during dynamic gas flow. To minimize the pressure non-uniformities in such chambers, baffles are gener...

Towards SU(2) invariant formulation of the monopole confinement mechanism

The type of the vacuum is studied numerically in the maximally Abelian (MA) gauge and in the Landau (LA) gauge of SU(2) gluodynamics. The type of the vacuum is determined by a ratio between the dual coherence and the dual penetration lengths. The dual penetration length is determined from correlations between Wilson loops and electric fields in both gauges. The dual coherence length is found fr...

Techniques Used for Vacuum Standardization

Numerous primary vacuum standards namely Mercury Manometer Standard, Volume Expansion Standard and Orifice Flow Standard of different ranges and designs have been developed by various international vacuum metrology laboratories, for the calibration of vacuum gauges. This paper briefly describes a variety of scientific techniques that had either been used or are employed in different primary vac...