Tootfinder

Local Expansion Mechanisms for Quantum-Scale Wormholes
Philipp Dorau, Albert Much
https://arxiv.org/abs/2509.10137 https://arxiv.org/pdf/2509.10137

Local Expansion Mechanisms for Quantum-Scale Wormholes
Models of quantum spacetime that are consistent with quantum energy inequalities potentially enable the formation of Planck scale wormholes. Building on the proposal of Morris, Thorne, and Yurtsever that such microscopic spacetime structures might be enlarged to macroscopic size, we revisit Roman's analysis of a wormhole in an inflationary de Sitter background. In this context, we introduce a refined quasi-local toy mechanism, which we call the local inflation bubble. This construction inflates…

Gravitational lensing by Lema\^{\i}tre-Tolman-Bondi wormholes in a Friedmann universe
Kirill A. Bronnikov, Valeria A. Ishkaeva, Sergey V. Sushkov
https://arxiv.org/abs/2509.09797

Gravitational lensing by Lema\^ıtre-Tolman-Bondi wormholes in a Friedmann universe
The Lema\^ıtre-Tolman-Bondi (LTB) solution to the Einstein equations describes the dynamics of a self-gravitating spherically symmetric dust cloud with an arbitrary density profile and any distribution of initial velocities, encoded in three arbitrary functions $f(R)$, $F(R)$, and $τ_0(R)$, where $R$ is a radial coordinate in the comoving reference frame. A particular choice of these functions corresponds to a wormhole geometry with a throat defined as a sphere of minimum radius at a fixed ti…

Wormholes with low energy density
Peter K. F. Kuhfittig
https://arxiv.org/abs/2508.06597 https://arxiv.org/pdf/2508.06597

Wormholes with low energy density
In spite of their speculative nature, traversable wormholes are a topic of interest that started with the Einstein-Rosen bridge in 1935 and became a major research area with the introduction of the Morris-Thorne wormhole in 1988. It is also become apparent in time that such wormholes are likely to be compact stellar objects, akin to neutron stars. Although widely discussed, wormholes having a low energy density may therefore not be massive enough to exist on a macroscopic scale. Important examp…

Euclidean Wormholes and Gravitational States
Alexandre Belin
https://arxiv.org/abs/2508.14165 https://arxiv.org/pdf/2508.14165

Euclidean Wormholes and Gravitational States
Euclidean wormholes are known to encode important non-perturbative effects in the physics of quantum black holes. In this paper, we discuss the slicing of Euclidean wormholes along a time-reflection symmetric slice which treats half of the Euclidean geometry as a gravitational machinery to produce a semi-classical state. This type of state preparation is different from Hartle-Hawking states prepared with the CFT path integral, such as the thermofield-double state. Nevertheless, the two differen…

Perturbations of Einstein-Maxwell-phantom spacetime: Instabilities of charged Ellis wormholes and quasinormal modes of black holes
Guan-Yu Wu, Si-Yu Wang, Yan-Gang Miao
https://arxiv.org/abs/2507.02258

Perturbations of Einstein-Maxwell-phantom spacetime: Instabilities of charged Ellis wormholes and quasinormal modes of black holes
Phantom scalar fields, as a viable candidate for dark energy, have been instrumental in eliminating spacetime singularities and constructing wormholes and regular black holes. We investigate the Einstein-Maxwell-phantom (EMP) framework, in which the Ellis wormholes can be charged and regular black holes can be admitted. While the previous study has shown the stability of EMP wormholes under massless scalar field perturbations, we further perform a comprehensive linear analysis of the EMP spacet…

Black holes and wormholes in sourceless three-dimensional conformal Killing gravity
Gerard Clement, Khireddine Nouicer
https://arxiv.org/abs/2508.05218 https://

Black holes and wormholes in sourceless three-dimensional conformal Killing gravity
We derive all the sourceless solutions of three-dimensional conformal Killing gravity with two Killing vectors. Along with singular solutions and BTZ black holes, the stationary solutions include regular warped AdS3 black holes and wormholes.

Evaporating Universes
Divij Gupta
https://arxiv.org/abs/2507.05363 https://arxiv.org/pdf/2507.05363

Evaporating Universes
Recent work by Headrick, Sasieta and myself provides an extension of the HRT formula for asymptotically flat spacetimes. I use this formula to construct a holographic model of black hole evaporation in four-dimensional asymptotically flat spacetimes using Brill-Lindquist (BL) wormholes. The wormhole is interpreted via ER=EPR to represent the entanglement geometry between an evaporating black hole and baths into which the Hawking radiation is collected. Applying HRT, I compute the entanglement e…

Traversable Kaluza-Klein wormholes?
Christopher Simmonds (Victoria University of Wellington), Matt Visser (Victoria University of Wellington)
https://arxiv.org/abs/2508.02824 ht…

Traversable Kaluza-Klein wormholes?
Various authors have suggested that Kaluza--Klein variants of traversable wormholes might to some extent ameliorate the defocussing properties (the curvature condition violations, and implied energy condition violations) inherent in positing the existence of a traversable wormhole throat. We shall show that in a Kaluza--Klein context the price paid for completely eliminating the defocussing properties of the wormhole throat is extremely high -- the 5th dimension has to become truly enormous (fo…

Non-stationary wormholes with the presence of scalar fields and modified gravity
G. Alencar, R. D\'arlla, Shin'ichi Nojiri, Sergei D. Odintsov, Diego S\'aez-Chill\'on G\'omez
https://arxiv.org/abs/2508.05536

Non-stationary wormholes with the presence of scalar fields and modified gravity
Some novel regular spacetimes are considered that show a non-stationary wormhole structure. A Simpson-Visser-like procedure is applied to reconstruct these regular spacetimes, free of time-like and space-like singularities. Such a procedure is also applied to describe a regular cosmological expansion, where the universe reaches a minimum scale and then rebounds. This type of regular spacetime is achieved by considering some scalar fields as sources, with the appropriate kinetic term and scalar …

Yukawa-Casimir wormholes within Einstein-Cartan gravity framework
Nayan Sarkar, Susmita Sarkar, Abdelmalek Bouzenada
https://arxiv.org/abs/2509.02631 https://

Yukawa-Casimir wormholes within Einstein-Cartan gravity framework
The Einstein-Cartan (EC) theory of gravity provides a natural extension of general relativity by incorporating spacetime torsion to account for the intrinsic spin of matter. In this work, we investigate Yukawa-Casimir traversable wormholes supported by three distinct Yukawa-Casimir energy density profiles within the framework of EC gravity. The resulting shape functions are shown to satisfy all the fundamental requirements for traversable wormhole geometries. Our analysis reveals that the prese…

Algebraic traversable wormholes
Eyoab Bahiru
https://arxiv.org/abs/2508.13283 https://arxiv.org/pdf/2508.13283

Algebraic traversable wormholes
We propose a new large $N$ limit which at the extreme limit is dual in the bulk to a back-reacted traversable wormhole, by making use if a novel definition of algebra at infinity, an algebra familiar in the literature from the study of quasi-local algebras. We also compute, from a purely algebraic perspective, the effects registered by a left universe observer due to a unitary fluctuation on the right universe of the traversable wormhole, and reproduce a result from an earlier computation by Ma…

Closed timelike curves in PT-symmetric wormholes
Hicham Zejli
https://arxiv.org/abs/2508.00035 https://arxiv.org/pdf/2508.00035

Closed timelike curves in PT-symmetric wormholes
We investigate a modified Einstein-Rosen wormhole model, made unidirectionally traversable through a bimetric geometry defined by two regular metrics, g(+) and g(-), and characterized by PT symmetry combining time reversal (t -> -t) and spatial inversion (x -> -x). In this framework, two distinct spacetime regions are identified at the wormhole throat (r = alpha) via PT symmetry, forming a single spacetime sheet. This model employs Eddington-Finkelstein coordinates to eliminate coordinate singu…

Dehnen-type dark matter wormholes in the $f(\mathcal{R},\mathcal{L}_m,\mathcal{T})$ action
A. Errehymy, O. Donmez, B. Turimov, K. Myrzakulov, N. Alessa, A. -H. Abdel-Aty
https://arxiv.org/abs/2507.16465

Dehnen-type dark matter wormholes in the $f(\mathcal{R},\mathcal{L}_m,\mathcal{T})$ action
We are exploring the possibility of traversable wormholes existing in a more realistic context. Specifically, we are looking at scenarios that don't rely on exotic factors, like having a mass shell at the throat or allowing particles and antiparticles to coexist without annihilation. To do this, we are constructing wormholes with double power-law density distributions, drawing inspiration from the Dehnen-type dark matter halo in the framework of generalized geometry-matter coupling gravity. Our…

Evolving Wormholes in a Cosmological Background
Mahdi Kord Zangeneh, Francisco S. N. Lobo
https://arxiv.org/abs/2507.14750 https://ar…

Evolving Wormholes in a Cosmological Background
Wormholes are non-trivial topological structures that arise as exact solutions to Einstein's field equations, theoretically connecting distinct regions of spacetime via a throat-like geometry. While static traversable wormholes necessarily require exotic matter that violates the classical energy conditions, subsequent studies have sought to minimize such violations by introducing time-dependent geometries embedded within cosmological backgrounds. This review provides a comprehensive survey of e…

Black holes and wormholes in Deser-Woodard gravity
Juliano C. S. Neves
https://arxiv.org/abs/2507.00936 https://arxiv.org/pdf/2507.00…

Black holes and wormholes in Deser-Woodard gravity
The Deser-Woodard gravity is a modified theory of gravity in which nonlocality plays a central role. In this context, nonlocality is consequence of the inverse of the d'Alembertian operator $\square^{-1}$ in the effective action. Here, analytic black hole and wormhole solutions are built in the revised Deser-Woodard theory following a recent approach, where a special tetrad frame simplifies the complicated field equations of the theory. From deviations of the Schwarzschild metric and Reissner-N…

Symmetry Sectors in Chord Space and Relational Holography in the DSSYK
Sergio E. Aguilar-Gutierrez
https://arxiv.org/abs/2506.21447 https://

Symmetry Sectors in Chord Space and Relational Holography in the DSSYK
Can there be multiple bulk theories for the same boundary theory? We answer this affirmatively in the double-scaled SYK (DSSYK) model using the tools of constrained systems. We find different symmetry sectors generated by specific constraints within the chord Hilbert space of the DSSYK with matter. Each sector corresponds to a different bulk description. These include chord parity symmetry, corresponding to End-Of-The-World (ETW) branes and Euclidean wormholes in sine dilaton gravity; and relat…

On the stability of exceptional Brans-Dicke wormholes
Kirill A. Bronnikov, Sergei V. Bolokhov, Milena V. Skvortsova, Rustam Ibadov, Feruza Y. Shaymanova
https://arxiv.org/abs/2507.17045

On the stability of exceptional Brans-Dicke wormholes
In our previous papers we have analyzed the stability of vacuum and electrovacuum static, spherically symmetric space-times in the framework of the Bergmann-Wagoner-Nordtvedt class of scalar-tensor theories (STT) of gravity. In the present paper, we continue this study by examining the stability of exceptional solutions of the Brans-Dicke theory with the coupling constant $ω=0$ that were not covered in the previous studies. Such solutions describe neutral or charged wormholes and involve a con…

Short-Range Approximation to Casimir Wormholes Inspired by Scalar and Electric Fields
Remo Garattini, Athanasios G. Tzikas
https://arxiv.org/abs/2507.19134 https://

Short-Range Approximation to Casimir Wormholes Inspired by Scalar and Electric Fields
We investigate a static traversable wormhole sustained by a combination of a minimally coupled scalar field and an electric field, with exotic matter sourced by Casimir energy. Considering two scenarios, where the Casimir plate separation is either radially variable or fixed, we derive analytical near-throat solutions for both massless and massive scalar fields. To ensure consistency of the field equations, a thermal tensor is also incorporated, consisting solely of pressure terms that vanish a…

Deflection of light by dark matter supporting traversable wormholes in the framework of Kalb-Ramond gravity
Susmita Sarkar, Nayan Sarkar
https://arxiv.org/abs/2507.12970

Deflection of light by dark matter supporting traversable wormholes in the framework of Kalb-Ramond gravity
This study explores the possible formation of asymptotically flat traversable wormholes within dark matter halos under the framework of Kalb-Ramond gravity. The wormhole solutions are derived based on the King and Navarro-Frenk-White dark matter density profiles associated with anisotropic matter sources. For a particular set of parameters, the proposed shape functions are found to be positively increasing and satisfy all the essential geometric conditions along with the flare-out condition, th…

Evolution of Dark Energies and Compact Objects in 4D Einstein Gauss Bonnet Gravity induced Universe A Data Based Perspective
Puja Mukherjee, Himanshu Chaudhary, Ujjal Debnath, G. Mustafa
https://arxiv.org/abs/2507.05223

Evolution of Dark Energies and Compact Objects in 4D Einstein Gauss Bonnet Gravity induced Universe A Data Based Perspective
Cosmic evolution is the most sensational topic among researchers of modern cosmology. This article explores cosmic evolution in 4D Einstein Gauss Bonnet (EGB) gravity, focusing on mass accretion of compact objects (black holes and wormholes) by dark energy (DE). Three DE models Chevallier Polarski Linder (CPL), Jassal Bagla Padmanabhan (JBP), and Barboza Alcaniz (BA) parameterizations are studied within 4D EGB gravity, with their Hubble parameters derived and compared against observational data…

Quantum-inspired wormholes from String T-Duality
Francisco S. N. Lobo, Manuel E. Rodrigues
https://arxiv.org/abs/2506.17950 https://a…

Quantum-inspired wormholes from String T-Duality
The intrinsic non-perturbative features of string-theoretic corrections, particularly those arising from T-duality, have been shown to naturally introduce an effective ultraviolet (UV) cutoff into the gravitational framework. This cutoff, often referred to as the zero-point length in the context of path integral duality, acts as a fundamental minimal length scale that regulates short-distance divergences. Using the established correspondence between T-duality and path integral duality, it has b…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Impacts of wormholes on false vacuum bubble tunneling
Hong Wang, Yuxuan Wu, Ran Li, Jin Wang

Spacetime foam correlation renders the cosmological constant (dark energy)
She-Sheng Xue
https://arxiv.org/abs/2507.15881 https://arxiv.org/pdf/2507.15881

Spacetime foam correlation renders the cosmological constant (dark energy)
Wheeler's spacetime foams (wormholes) at the Planck length undergo quantum nucleation, oscillation and annihilation. Their collective excitations over foamy spacetime interact with field operators at large distances. We describe such collective excitation and interaction using an effective ``foamon'' field coupled with field operators. The Wilson renormalisation group approach shows that the foamon field theory evolves from an infrared scaling invariant domain to an ultraviolet one, when numero…

Sculpting Spacetime: Thin Shells in Wormhole Physics
Francisco S. N. Lobo
https://arxiv.org/abs/2508.17823 https://arxiv.org/pdf/2508.17823

Sculpting Spacetime: Thin Shells in Wormhole Physics
In this work, we employ the Darmois-Israel thin-shell formalism to construct both static and dynamic thin-shell configurations surrounding traversable wormholes. Initially, using the cut-and-paste technique, we perform a linearized stability analysis in the presence of a general cosmological constant. Our results show that for sufficiently large positive values of the cosmological constant, corresponding to the Schwarzschild-de Sitter geometry, the stability regions of the wormhole solutions ar…