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- C Chen, James M. Nester, Roh-Suan Tung
- 1995

From a covariant Hamiltonian formulation, using symplectic ideas, we obtain covariant quasilocal energy-momentum boundary expressions for general gravity theories. The expressions depend upon whichâ€¦ (More)

- Roh-Suan Tung
- 2008

A class of boundary conditions for canonical general relativity are proposed and studied at the quasi-local level. It is shown that for un-trapped or marginal surfaces, fixing the area element on theâ€¦ (More)

- C Chen, James M. Nester, Roh-Suan Tung
- 2005

The Hamiltonian for a gravitating region includes a boundary term which determines not only the quasi-local values but also, via the boundary variation principle, the boundary conditions. Using ourâ€¦ (More)

- C Chen, James M. Nester, Roh-Suan Tung
- 2002

We first describe a class of spinor-curvature identities (SCI) which have gravitational applications. Then we sketch the topic of gravitational energymomentum, its connection with Hamiltonianâ€¦ (More)

A quasilocal framework of stationary and dynamical untrapped hypersurfaces is introduced to generalize the notions of energy and angular momentum of isolated and dynamical trapping horizons toâ€¦ (More)

Abstract Using quadratic spinor techniques we demonstrate that the Immirzi parameter can be expressed as ratio between scalar and pseudo-scalar contributions in the theory and can be interpreted as aâ€¦ (More)

- James M. Nester, Roh-Suan Tung, Yuan â€“ Zhong Zhang
- 1994

We discuss earlier unsuccessful attempts to formulate a positive gravitational energy proof in terms of the New Variables of Ashtekar. We also point out the difficulties of a Witten spinor typeâ€¦ (More)

A class of boundary conditions for canonical general relativity are proposed and studied at the quasi-local level. It is shown that for untrapped or marginal surfaces, fixing the area element on theâ€¦ (More)

- James M. Nester, Roh-Suan Tung, Vadim V. Zhytnikov
- 1994

We describe a class of spinor-curvature identities which exist for Riemannian or Riemann-Cartan geometries. Each identity relates an expression quadratic in the covariant derivative of a spinor fieldâ€¦ (More)

Using the Generalized Differential Calculus, we establish the generalized Chern-Weil homomormism, re-derive the geometric properties for both P (M4, G) and pseudo-Riemannian spacetime manifolds fromâ€¦ (More)