Generalized spherically symmetric gravitational model: Hamiltonian dynamics in extended phase space and BRST charge

TL;DR

This paper develops a Hamiltonian framework for a generalized spherically symmetric gravitational model, establishing BRST invariance and constructing the BRST charge, which aligns with the full gravitational theory better than finite models.

Contribution

It introduces a Hamiltonian dynamics approach in extended phase space for the model, constructs a BRST invariant effective action, and derives a BRST charge that correctly generates gauge transformations.

Findings

Hamiltonian dynamics in extended phase space is equivalent to Lagrangian dynamics.

A BRST invariant effective action is constructed.

The BRST charge correctly generates gauge transformations for all degrees of freedom.

Abstract

We construct Hamiltonian dynamics of the generalized spherically symmetric gravitational model in extended phase space. We start from the Faddeev - Popov effective action with gauge-fixing and ghost terms, making use of gauge conditions in differential form. It enables us to introduce missing velocities into the Lagrangian and then construct a Hamiltonian function according a usual rule which is applied for systems without constraints. The main feature of Hamiltonian dynamics in extended phase space is that it can be proved to be completely equivalent to Lagrangian dynamics derived from the effective action. We find a BRST invariant form of the effective action by adding terms not affecting Lagrangian equations. After all, we construct the BRST charge according to the Noether theorem. Our algorithm differs from that by Batalin, Fradkin and Vilkovisky, but the resulting BRST charge generates correct transformations for all gravitational degrees of freedom including gauge ones. Generalized spherically symmetric model imitates the full gravitational theory much better then models with finite number of degrees of freedom, so that one can expect appropriate results in the case of the full theory.