Symmetric Thin-Shell Wormholes from a Regularized String-Cloud Black Hole: Energy Conditions, Multi-Fluid Stability, and Optical Signatures
Abstract
We construct a symmetric thin-shell wormhole from two copies of the positive-lapse exterior of a rationally regularized Letelier--Alencar string-cloud black hole with a finite-curvature anti--de Sitter core and string-cloud asymptotics. Using the Darmois--Israel formalism, we derive the surface stresses, energy-condition combinations, conservation law, and effective potential. Every admissible static throat has negative surface energy density, so the weak and dominant energy conditions are violated, whereas the null condition restricted to directions tangent to the shell, and consequently the intrinsic strong condition, holds only in the inner sampled exterior. The radial-vacuum relation of the bulk source removes the external momentum flux. We derive a general local-stability criterion for density- and radius-dependent equations of state and apply it to five surface-fluid models, calibrating one parameter at each static throat. Across the sampled families, barotropic shells remain unstable, whereas the other closures can admit parameter-dependent stable branches. An exact unregularized control shows that the energy-condition structure and the radial-stability signs of the first three closures persist without the rational regulator, whereas the cosmic-Chaplygin stability sign can change while the selected calibration branch remains real and simple. Backward ray tracing shows that throat location primarily reorganizes higher-order and through-throat images, while string-cloud strength and inclination control annular structure and Doppler asymmetry. Comparisons of one- and two-sided source configurations isolate genuine far-side images and show that the central dark region depends on the source distribution.
Related
- On The Regularized McVittie Black Bounce and a Family of Traversable Wormholes
- Strong-deflection scaling in nearly symmetric thin-shell wormholes
- Additional Observational Signatures of Asymmetric Thin-Shell Wormholes within 4D Einstein-Gauss-Bonnet Gravity
- Optical and Dynamical Signatures of Padé Approximated Wormholes in f(T) Gravity
- Tidal Love Numbers of Thin-Shell Wormholes, de Sitter Gravastars, and Anti-de Sitter Gravastars via Full Perturbed Junction Conditions
BibTeX
@misc{zhong2026symmetric,
title = {{Symmetric Thin-Shell Wormholes from a Regularized String-Cloud Black Hole: Energy Conditions, Multi-Fluid Stability, and Optical Signatures}},
author = {Zijun Zhong and Jonathan A. Reboucas and Edson Otoniel and Minyong Guo},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.00131},
eprint = {2610.00131},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.00131},
}
RIS
TY - UNPB
TI - Symmetric Thin-Shell Wormholes from a Regularized String-Cloud Black Hole: Energy Conditions, Multi-Fluid Stability, and Optical Signatures
AU - Zijun Zhong
AU - Jonathan A. Reboucas
AU - Edson Otoniel
AU - Minyong Guo
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2610.00131
UR - https://arxiv.org/abs/2610.00131
AB - We construct a symmetric thin-shell wormhole from two copies of the positive-lapse exterior of a rationally regularized Letelier--Alencar string-cloud black hole with a finite-curvature anti--de Sitter core and string-cloud asymptotics. Using the Darmois--Israel formalism, we derive the surface stresses, energy-condition combinations, conservation law, and effective potential. Every admissible static throat has negative surface energy density, so the weak and dominant energy conditions are violated, whereas the null condition restricted to directions tangent to the shell, and consequently the intrinsic strong condition, holds only in the inner sampled exterior. The radial-vacuum relation of the bulk source removes the external momentum flux. We derive a general local-stability criterion for density- and radius-dependent equations of state and apply it to five surface-fluid models, calibrating one parameter at each static throat. Across the sampled families, barotropic shells remain unstable, whereas the other closures can admit parameter-dependent stable branches. An exact unregularized control shows that the energy-condition structure and the radial-stability signs of the first three closures persist without the rational regulator, whereas the cosmic-Chaplygin stability sign can change while the selected calibration branch remains real and simple. Backward ray tracing shows that throat location primarily reorganizes higher-order and through-throat images, while string-cloud strength and inclination control annular structure and Doppler asymmetry. Comparisons of one- and two-sided source configurations isolate genuine far-side images and show that the central dark region depends on the source distribution.
ER -