Article
Astronomy & Astrophysics
Valeria A. Ishkaeva, Sergey Sushkov
Summary: This paper investigates the gravitational lensing properties of the Ellis-Bronnikov wormhole, exploring the propagation of light and image formation process, and compares it with the Schwarzschild black hole.
Article
Environmental Sciences
Wei Li, John T. Germaine, Herbert H. Einstein
Summary: Understanding the formation and evolution of wormholes in porous media is crucial for various natural and industrial processes. Through core flood tests, it is found that the lengths of wormholes follow a power-law distribution, with more short ones than long ones. This statistical nature allows for experimental investigation of wormhole competition in three dimensions. Additionally, the existing wormhole-matrix models underestimate the lengths due to neglected radial flow near the wormhole tip, which is improved by approximating with a Rankine ovoid model.
WATER RESOURCES RESEARCH
(2022)
Article
Astronomy & Astrophysics
Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, Jutta Kunz
Summary: This paper presents a new model describing rapidly rotating neutron stars with wormholes in their centers. The model is based on general relativity and the presence of a ghost scalar field. The nuclear matter is described by a polytropic equation of state, resulting in realistic masses and radii for the neutron stars. The wormholes have small circumferential radii, up to 3 km. As the size of the wormhole increases, the masses and radii of the stars decrease, while the existence domain of these rotating mixed neutron-star-plus-wormhole systems retains the characteristic properties of a rotating neutron star domain. The question of stability of the mixed configurations under consideration is briefly discussed.
Article
Astronomy & Astrophysics
Antonio M. Garcia-Garcia, Victor Godet
Summary: In this study, a two-site Sachdev-Ye-Kitaev (SYK) model with complex couplings is investigated, and a low temperature transition to a gapped phase characterized by a constant in temperature free energy is identified. A gravity interpretation of these results is proposed by constructing an explicit solution of Jackiw-Teitelboim gravity with matter, which involves a two-dimensional Euclidean wormhole with the geometry of a double trumpet. This transition from a disconnected phase with two black holes to the connected wormhole phase is observed as the temperature decreases, demonstrating how a Euclidean wormhole can arise from an average over field theory couplings.
Article
Astronomy & Astrophysics
Jinbo Yang, Hyat Huang
Summary: The study presents a family of dynamic solutions in the EMS theory to describe evolving black (white) holes or wormholes and their transitions. Comparing different wormhole throat definitions, trapping horizons are found to be the most suitable choice for tracking the evolution in a unified framework. By studying evolving processes in various parameter regions, including charge and parameters in the EMS Lagrangian, the appearance of a degenerate marginal trapped surface is identified as a crucial event for conversion or transition.
Article
Energy & Fuels
Hyunsang Yoo, Tan Nguyen, Jeonghwan Lee
Summary: Improvements were made to the wormhole prediction model in this study, which allowed for the determination of the optimum injection rate and wormhole velocity. Compared to the previous model, the new model showed better accuracy in predicting wormhole propagation.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Physics, Particles & Fields
Juan Maldacena, Alexey Milekhin
Summary: We investigate the real-time formation of the ground state of two coupled SYK models, finding that the system forms a wormhole through a region with negative specific heat in a time independent of system size N. The dynamics is smooth and appears to follow equilibrium thermodynamic configurations of the microcanonical ensemble. Additionally, we discuss the relationship between the coupled SYK model and the Jackiw-Teitelboim gravity theory with bulk fields.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tingqi Cai, Zun Wang, Hyat Huang, Mian Zhu
Summary: In this paper, we investigate the weak-field deflection angle of the Ellis-Bronnikov wormhole up to the 1/b(4) order. We compare different approximation formalisms and evaluate their accuracy by comparing with numerical results. We also find that the choice of coordinate system is crucial for evaluating lensing physics.
Article
Physics, Particles & Fields
Yuan Yue, Peng-Bo Ding, Yong-Qiang Wang
Summary: In this paper, the model of bosonic matter with a nontrivial wormhole spacetime topology supported by a free phantom field is revisited. A new type of boson star with wormhole solutions, where the complex scalar field possesses full parity-odd symmetry, is obtained. The behavior of boson stars with wormhole approaches that of boson stars when the size of the throat is small, but is replaced by a loop structure when the size of the throat is intermediate. The complex scalar field can form two boson stars with opposite phase differences in the limit of vanishing throat size.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Thermodynamics
Francisco J. Arias
Summary: In this study, a simplified expression for the effective thermal conductivity of dilute dispersion of hollow spheres was derived using a generalization of Maxwell's method. It was found that the formula is similar to that of solid spheres, but with a modification of the effective thermal conductivity due to the hollow core. The study also investigated the additional condition for floating dispersion in liquids.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Multidisciplinary
A. C. L. Santos, C. R. Muniz, L. T. Oliveira
Summary: This letter investigates changes in the quantum vacuum energy of a massless scalar field inside a Casimir cavity orbiting a wormhole, considering a cosmological model with the isotropic Morris-Thorne wormhole embedded in the FLRW Universe. It examines the effects of global curvature and scale factor, as well as local geometry and inertial forces, on the Casimir energy density at a moment in cosmic history. The study also explores the behavior of this quantity when plates are positioned without rotation at opposite sides of the wormhole throat, at zero and finite temperatures, taking into account the effective distance between the plates through the wormhole throat.
Article
Astronomy & Astrophysics
Ismael Ayuso, Francisco S. N. Lobo, Jose P. Mimoso
Summary: In this work, wormhole geometries in a modified gravity theory derived from a nonconservative gravitational theory, known as action-dependent Lagrangian theories, are explored. The gravitational field equation depends on a background four-vector lambda(mu) associated with the gravitational Lagrangian's dependence on the action, and may depend on spacetime coordinates. By considering wormhole configurations using Buchdahl coordinates, it is found that the four-vector lambda(mu) = (0, 0, lambda(theta), 0), and the spacetime geometry is constrained by the condition g(tt)g(uu) = -1. A variety of specific asymptotically flat, symmetric, and asymmetric solutions with power law choices for the function lambda are derived by generalizing previous solutions.
Article
Astronomy & Astrophysics
Efthimia Deligianni, Burkhard Kleihaus, Jutta Kunz, Petya Nedkova, Stoytcho Yazadjiev
Summary: The analysis of circular orbits for massive particles around symmetric rotating Ellis wormholes revealed distinct properties compared to Teo wormholes and Kerr black hole, including stronger resonances and localization near the wormhole throat, leading to further signal amplification.
Article
Computer Science, Information Systems
Nadav Schweitzer, Amit Dvir, Ariel Stulman
Summary: This research proposes a method to maximize the profit of the wormhole attack and challenges the assumptions of the existing attack protocol. Simulating different combinations of network nodes and edges, it shows the effectiveness of an alternative attack method that does not require additional virtual links and decreases the chances of being detected by intrusion detection systems.
Article
Energy & Fuels
K. Furui, T. Abe, T. Watanabe, K. Yoshioka
Summary: Fluid flow in geologic formations can lead to the formation of wormholes, which are dendritic patterns formed by mineral dissolution. This study focuses on the process instability driven by reaction-infiltration and applies a phase-field approach to simulate wormhole formation. The results show that the model is capable of accurately predicting the growth patterns of wormholes.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
