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Hamiltonian and Noether charges in first order gravity

  • Alejandro CorichiEmail author
  • Iraís Rubalcava-García
  • Tatjana Vukašinac
Editor's Choice (Research Article)

Abstract

We consider gravity in four dimensions in the vielbein formulation, where the fundamental variables are a tetrad \(e\) and a SO(3,1) connection \(\omega \). We start with the most general action principle compatible with diffeomorphism invariance which includes, besides the standard Palatini term, other terms that either do not change the equations of motion, or are topological in nature. For our analysis we employ the covariant Hamiltonian formalism where the phase space \(\Gamma \) is given by solutions to the equations of motion. We consider spacetimes that include a boundary at infinity, satisfying asymptotically flat boundary conditions and/or an internal boundary satisfying isolated horizons boundary conditions. For this extended action we study the effect of the topological terms on the Hamiltonian formulation. We prove two results. The first one is rather generic, applicable to any field theory with boundaries: The addition of topological terms (and any other boundary term) does not modify the symplectic structure of the theory. The second result pertains to the conserved Hamiltonian and Noether charges, whose properties we analyze in detail, including their relationship. While the Hamiltonian charges are unaffected by the addition of topological and boundary terms, we show in detail that the Noether charges do change. Thus, a non-trivial relation between these two sets of charges arises when the boundary and topological terms needed for a consistent formulation are included.

Keywords

Action principle Hamiltonian formulation Boundary terms Asymptotically flat configurations Conserved charges 

Notes

Acknowledgments

We would like to thank N. Bodendorfer, S. Deser, T. Jacobson and R. Olea for comments. We would also like to thank an anonymous referee for comments that helped to improve the manuscript. This work was in part supported by CONACyT 0177840, DGAPA-UNAM IN100212, and NSF PHY 1205388 Grants, the Eberly Research Funds of Penn State and by CIC, UMSNH.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Alejandro Corichi
    • 1
    • 2
    Email author
  • Iraís Rubalcava-García
    • 1
    • 3
  • Tatjana Vukašinac
    • 4
  1. 1.Centro de Ciencias MatemáticasUniversidad Nacional Autónoma de MéxicoMoreliaMexico
  2. 2.Center for Fundamental Theory, Institute for Gravitation and the CosmosPennsylvania State UniversityUniversity ParkUSA
  3. 3.Instituto de Física y MatemáticasUniversidad Michoacana de San Nicolás de HidalgoMoreliaMexico
  4. 4.Facultad de Ingeniería CivilUniversidad Michoacana de San Nicolás de HidalgoMoreliaMexico

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