Covariant Hamiltonian Gravity in Spherical Symmetry
Abstract
Building upon the covariant Hamiltonian gravity in spherical symmetry, we construct the effective Einstein equation governing gravitational dynamics. For any prescribed one-parameter family of static, spherically symmetric metrics, this equation can be constructed such that the prescribed family constitutes their vacuum solutions. As an application, we construct generalized Vaidya solutions to the effective Einstein equation and show that the corresponding energy-momentum tensor takes precisely the standard Vaidya form. The results demonstrate that standard null dust sources can serve as matter source for dynamical black-hole geometries beyond general relativity, including regular black holes. Furthermore, this work suggests that quantum gravity corrections alone may not account for Hawking-like evaporation, as mass loss in the ingoing Vaidya solution necessarily requires a violation of the null energy condition within our effective framework.
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BibTeX
@misc{zhang2026covariant,
title = {{Covariant Hamiltonian Gravity in Spherical Symmetry}},
author = {Cong Zhang and Zhoujian Cao},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.11099},
eprint = {2611.11099},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.11099},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Covariant Hamiltonian Gravity in Spherical Symmetry
AU - Cong Zhang
AU - Zhoujian Cao
PY - 2026
DA - 2026/11/08
PB - arXiv
DO - 10.48550/arxiv.2611.11099
UR - https://arxiv.org/abs/2611.11099
AB - Building upon the covariant Hamiltonian gravity in spherical symmetry, we construct the effective Einstein equation governing gravitational dynamics. For any prescribed one-parameter family of static, spherically symmetric metrics, this equation can be constructed such that the prescribed family constitutes their vacuum solutions. As an application, we construct generalized Vaidya solutions to the effective Einstein equation and show that the corresponding energy-momentum tensor takes precisely the standard Vaidya form. The results demonstrate that standard null dust sources can serve as matter source for dynamical black-hole geometries beyond general relativity, including regular black holes. Furthermore, this work suggests that quantum gravity corrections alone may not account for Hawking-like evaporation, as mass loss in the ingoing Vaidya solution necessarily requires a violation of the null energy condition within our effective framework.
ER -