This shows you the differences between two versions of the page.
Both sides previous revision Previous revision | Next revision Both sides next revision | ||
advanced_notions:observable [2017/11/19 06:43] jakobadmin [Researcher] |
advanced_notions:observable [2017/11/19 06:57] jakobadmin [Researcher] |
||
---|---|---|---|
Line 22: | Line 22: | ||
The simplest example of an observable in gauge theory are Wilson loops. | The simplest example of an observable in gauge theory are Wilson loops. | ||
+ | |||
+ | Take note that this procedure of modding out $\mathcal G$ from $\mathcal A$ is what leads to [[theories:quantum_theory:quantum_field_theory:ghosts|Ghosts]]. To do this properly requires to make use of the [[advanced_tools:gauge_symmetry:brst|BRST]] formalism. | ||
(Source: Baez, Munian; Gauge Fields, Knots and Gravity, page 342) | (Source: Baez, Munian; Gauge Fields, Knots and Gravity, page 342) | ||