@article{2c874866d84c4a53a7add3e76171dc6b,
title = "Optimal choices of reference for a quasi-local energy",
abstract = "We propose a program for determining the reference for the covariant Hamiltonian boundary term quasi-local energy and test it on spherically symmetric spacetimes. For different observers the quasi-local energy can be positive, zero, or even negative, however the maximum value is positive for both the Schwarzschild and FLRW spacetimes.",
keywords = "Covariant Hamiltonian, Hamiltonian boundary term, Quasi-local energy, Reference spacetime",
author = "Wu, {Ming Fan} and Chen, {Chiang Mei} and Liu, {Jian Liang} and Nester, {James M.}",
note = "Funding Information: This work was supported by the National Science Council of the R.O.C. under the grants NSC-98-2112-M-008-008 (JMN) and NSC 96-2112-M-008-006-MY3 (CMC) and in part by the National Center of Theoretical Sciences (NCTS) .",
year = "2010",
month = aug,
day = "2",
doi = "10.1016/j.physleta.2010.07.004",
language = "???core.languages.en_GB???",
volume = "374",
pages = "3599--3602",
journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",
issn = "0375-9601",
number = "35",
}