Analytical solutions for timelike orbits around Damour-Solodukhin wormholes
Abstract
We investigate timelike geodesics around Damour-Solodukhin wormholes, which are Schwarzschild-like geometries characterized by a deformation parameter λ that determines the radius of the throat, rth. The radial potential admits four roots, including the throat radius itself, allowing the throat to merge with other roots and form double, triple, and quartic degeneracies. Triple-root configurations associated with the throat, in principle, can determine the innermost stable circular orbit (ISCO), which provides a potential observational distinction from Schwarzschild black holes. Using the Mino-time parametrization, we derive particle trajectories with closed-form analytical solutions in terms of incomplete elliptic integrals for both bound and unbound motion. Our focus is on the location of double or triple roots at the throat, where the azimuthal angle and coordinate time of orbital motion show logarithmic or power-law divergence as the particle approaches the throat. By contrast, trajectories remain regular when the throat corresponds to a simple root, allowing particles to traverse smoothly between the two asymptotically flat regions. We also derive exact homoclinic solutions associated with the throat and compute the corresponding Lyapunov exponent. In addition, inspiral and plunge trajectories through the throat are analyzed. These results provide analytic insights into the particle dynamics and possible observational signatures of the wormholes.
Versions
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BibTeX
@misc{ho2026analytical,
title = {{Analytical solutions for timelike orbits around Damour-Solodukhin wormholes}},
author = {Shao-Chen Ho and Yo-Chung Ko and Tien Hsieh and Da-Shin Lee},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.22187},
eprint = {2605.22187},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.22187},
}
RIS
TY - UNPB
TI - Analytical solutions for timelike orbits around Damour-Solodukhin wormholes
AU - Shao-Chen Ho
AU - Yo-Chung Ko
AU - Tien Hsieh
AU - Da-Shin Lee
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2605.22187
UR - https://arxiv.org/abs/2605.22187
AB - We investigate timelike geodesics around Damour-Solodukhin wormholes, which are Schwarzschild-like geometries characterized by a deformation parameter λ that determines the radius of the throat, r_th. The radial potential admits four roots, including the throat radius itself, allowing the throat to merge with other roots and form double, triple, and quartic degeneracies. Triple-root configurations associated with the throat, in principle, can determine the innermost stable circular orbit (ISCO), which provides a potential observational distinction from Schwarzschild black holes. Using the Mino-time parametrization, we derive particle trajectories with closed-form analytical solutions in terms of incomplete elliptic integrals for both bound and unbound motion. Our focus is on the location of double or triple roots at the throat, where the azimuthal angle and coordinate time of orbital motion show logarithmic or power-law divergence as the particle approaches the throat. By contrast, trajectories remain regular when the throat corresponds to a simple root, allowing particles to traverse smoothly between the two asymptotically flat regions. We also derive exact homoclinic solutions associated with the throat and compute the corresponding Lyapunov exponent. In addition, inspiral and plunge trajectories through the throat are analyzed. These results provide analytic insights into the particle dynamics and possible observational signatures of the wormholes.
ER -