A0 Condensation, Nielsen’s Identity and Effective Potential of Order Parameter

In high temperature SU(2) gluodynamics, the condensation of zero component gauge field potential A_0 =const and its gauge-fixing dependence are investigated. is mutually related with Polyakov's loop . The two-loop effective W(A_0,xi) recalculated in background relativistic R_xi gauge. It depends on parameter xi, has a nontrivial minimum satisfies Nielsen's identity. These signs mean invariance phenomenon. Following idea Belyaev, we express terms obtained order differs from that derived by this author. independent xi position. Hence follows. We show equation relating (A_0)|_(classical) coincides special characteristic orbit (A)$-plain along which xi-independent. way link between these two invariant descriptions established. value Polyakov calculated. Comparison results other authors given.