Regularization effects on the observational appearance of asymmetric thin-shell wormholes from a new string-cloud geometry
Abstract
We investigate how rational regularization of the new Letelier--Alencar string-cloud geometry changes the optical appearance of reflection-asymmetric thin-shell wormholes. We compare junctions with two nonregular exteriors, a regular observer exterior paired with a nonregular one, or two regular exteriors at fixed leading asymptotic masses, throat radius, string strength and regulator fractions. Critical scales, ray classes, orbit numbers and transfer functions are combined with three emission profiles and matched black-hole controls. Face-on and inclined images use the same prescribed emitter motion: circular timelike geodesics outside the innermost stable circular orbit and an inward plunge conserving its specific energy and angular momentum inside. Although the core is excised, regularization changes the retained exterior and throat matching. For the sampled parameters, the observer critical screen impact decreases from 10.392μ1 to 9.642μ1, where μ1 is the observer-side asymptotic mass scale. Regularizing the second exterior then contracts the reflected interval from 3.890μ1 to 1.248μ1 without changing ordinary observer-side rays. Returned brightness depends on source support and velocity-dependent frequency shifts: the regular--regular image nearly coincides with its black-hole control for the outer-edge emission model face-on, while inner emission reveals returned structures. At large sampled inclination that near-degeneracy can be lifted. This separates regularization-dependent propagation from the emission and viewing conditions that determine its image contrast.
Related
- Additional Observational Signatures of Asymmetric Thin-Shell Wormholes within 4D Einstein-Gauss-Bonnet Gravity
- Dirac Fermion Scattering and Conductance Response in Asymmetric Graphene Wormholes
- Decoupled asymmetric thin-shell wormholes
- Optical effects of one-sided Kiselev-type quintessence in reflection-asymmetric polymer thin-shell wormholes
- Traversable Wormholes Supported by Conformally Coupled Scalar Fields in D ≥ 4: Geometry, Geodesics, and Quasinormal Modes
BibTeX
@misc{zhong2026regularization,
title = {{Regularization effects on the observational appearance of asymmetric thin-shell wormholes from a new string-cloud geometry}},
author = {Zijun Zhong and Jonathan A. Rebouças and Edson Otoniel and Minyong Guo},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27144},
eprint = {2610.27144},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27144},
note = {CC0},
}
RIS
TY - UNPB
TI - Regularization effects on the observational appearance of asymmetric thin-shell wormholes from a new string-cloud geometry
AU - Zijun Zhong
AU - Jonathan A. Rebouças
AU - Edson Otoniel
AU - Minyong Guo
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.27144
UR - https://arxiv.org/abs/2610.27144
AB - We investigate how rational regularization of the new Letelier--Alencar string-cloud geometry changes the optical appearance of reflection-asymmetric thin-shell wormholes. We compare junctions with two nonregular exteriors, a regular observer exterior paired with a nonregular one, or two regular exteriors at fixed leading asymptotic masses, throat radius, string strength and regulator fractions. Critical scales, ray classes, orbit numbers and transfer functions are combined with three emission profiles and matched black-hole controls. Face-on and inclined images use the same prescribed emitter motion: circular timelike geodesics outside the innermost stable circular orbit and an inward plunge conserving its specific energy and angular momentum inside. Although the core is excised, regularization changes the retained exterior and throat matching. For the sampled parameters, the observer critical screen impact decreases from 10.392μ_1 to 9.642μ_1, where μ_1 is the observer-side asymptotic mass scale. Regularizing the second exterior then contracts the reflected interval from 3.890μ_1 to 1.248μ_1 without changing ordinary observer-side rays. Returned brightness depends on source support and velocity-dependent frequency shifts: the regular--regular image nearly coincides with its black-hole control for the outer-edge emission model face-on, while inner emission reveals returned structures. At large sampled inclination that near-degeneracy can be lifted. This separates regularization-dependent propagation from the emission and viewing conditions that determine its image contrast.
ER -