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5 papers · 2 filters
Brans-Dicke theory of gravity with torsion: A possible solution of the -problem
Yu-Huei Wu, Chih-Hung Wang
We study the Brans-Dicke theory of gravity in Riemann-Cartan space-times, and obtain general torsion solutions, which are completely determined by Brans-Dicke scalar field , in…
A reference for the covariant Hamiltonian boundary term
James M. Nester, Chiang-Mei Chen, Jian-Liang Liu +1
The Hamiltonian for dynamic geometry generates the evolution of a spatial region along a vector field. It includes a boundary term which determines both the value of the Hamiltonia…
Quasi-local Energy for Spherically Symmetric Spacetimes
Ming-Fan Wu, Chiang-Mei Chen, Jian-Liang Liu +1
We present two complementary approaches for determining the reference for the covariant Hamiltonian boundary term quasi-local energy and test them on spherically symmetric spacetim…
Quasilocal energy-momentum for tensors B and V in small regions
Lau Loi So
The Bel-Robinson tensor and the tensor have the same quasilocal energy-momentum in a small sphere. Using a pseudotensor approach to evaluate the energy-momentum in a half-c…
Lie Group Contractions and Relativity Symmetries
Dai-Ning Cho, Otto C. W. Kong
With a more relaxed perspective on what constitutes a relativity symmetry mathematically, we revisit the notion of possible relativity or kinematic symmetries mutually connected th…