Review
Multidisciplinary Sciences
Kirill A. Bronnikov
Summary: In this review, the authors present recently obtained traversable wormhole models in the framework of general relativity in four and six dimensions, expanding our understanding of wormhole existence and properties. These models include rotating cylindrical wormholes, cosmological wormholes based on the Lemaitre-Tolman-Bondi solution, and wormholes obtained in six-dimensional GR.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Physics, Multidisciplinary
Tao Yu, Dante M. Kennes, Angel Rubio, Michael A. Sentef
Summary: Recent measurements of resistivity in magic-angle twisted bilayer graphene near the superconducting transition temperature exhibit twofold anisotropy when changing the direction of an in-plane magnetic field. This was interpreted as evidence for exotic nematic superconductivity. However, experimental findings suggest that in-plane magnetic field can hybridize chiral superconducting order parameters to induce nematicity in the transport response.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
M. Roppongi, K. Ishihara, Y. Tanaka, K. Ogawa, K. Okada, S. Liu, K. Mukasa, Y. Mizukami, Y. Uwatoko, R. Grasset, M. Konczykowski, B. R. Ortiz, S. D. Wilson, K. Hashimoto, T. Shibauchi
Summary: The recently discovered kagome superconductors AV(3)Sb(5) (A = K, Rb, Cs) exhibit unusual CDW orders with symmetry breaking. The symmetry of the superconductivity inside the CDW phase is still unknown. Impurity effects in CsV3Sb5 were studied using electron irradiation as a phase-sensitive probe, and the results indicate that CsV3Sb5 is a non-chiral, anisotropic s-wave superconductor with no sign change.
NATURE COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
Kh. Saaidi, S. Tavakoli
Summary: By utilizing the static, spherically symmetric condition for space time and a general form of dark energy in the f (T) scenario of gravity, several geometries for wormholes have been obtained. These geometries can explain traversable wormholes without violating the NEC or WEC. The solutions are obtained based on specific conditions on the general form of f (T) and df (T)/dT.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Joao M. Dias, Antonia M. Frassino, Valentin D. Paccoia, Jorge V. Rocha
Summary: We use ray-tracing techniques to study the evolution of the event horizon of a large black hole as it consumes a tiny wormhole. Different setups show the merging of disconnected horizons and the appearance and disappearance of islands in the black hole's interior. The lifetime of these islands depends on the distance between the wormhole mouths and the existence of achronal averaged null energy condition.
Article
Astronomy & Astrophysics
Diptarka Das, Sridip Pal, Anurag Sarkar
Summary: Recent research has shown that the reconstruction of a black-hole interior is sensitive to knowing the exact coupling of the boundary theory, even if the coupling is irrelevant. By deforming the Sachdev-Ye-Kitaev model with irrelevant coupling, it has been found that half-wormholes and wormholes persist, offering a similar mechanism to address the factorization problem. The study also reveals nontrivial dynamics of saddles in the two-time Sachdev-Ye-Kitaev model as the couplings are varied.
Article
Astronomy & Astrophysics
Tokiro Numasawa
Summary: This article studies coupled Sachdev-Ye-Kitaev (SYK) models and nearly AdS(2) gravities. By constructing models and entangling matter fields, the authors show the phenomenon of first order phase transitions at zero temperature under different couplings. The results of the study demonstrate that the exchange of wormholes plays an important role, and in Lorentzian signature, bra-ket wormholes lead to two entangled closed universes.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Materials Science, Multidisciplinary
H. C. Robarts, M. Garcia-Fernandez, J. Li, A. Nag, A. C. Walters, N. E. Headings, S. M. Hayden, Ke-Jin Zhou
Summary: RIXS is a powerful probe for studying elementary excitations in solids, particularly magnetic excitations. This study reports the measurement of magnetic excitations in La2CuO4 using RIXS with high resolution and complex interpretation. The results confirm the genuine wave-vector and energy dependence of S(Q,.) for a cuprate antiferromagnet, showing structured multi-magnon excitations with dispersing peaks in addition to single-magnon excitations.
Article
Physics, Multidisciplinary
Ali Ovgun
Summary: This paper constructs an evolving wormhole in the dark matter halo using Chaplygin gas and Navarro-Frenk-White dark matter density profile, satisfying the flare-out condition by violating the null energy condition. It reveals how a topological deformation parameter alpha affects the evolving wormhole sourced with some dark matter models based on the physically motivated shape function.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Astronomy & Astrophysics
Naoki Tsukamoto
Summary: The study introduces reflection-asymmetric thin-shell wormholes with double shadows, composed of parts of Schwarzschild and Reissner-Nordstrom spacetimes with two photon spheres of different sizes. The researchers discussed the observational properties of these double shadows seen from an observer's perspective, emphasizing the presence of two photon rings with varying diameters.
Article
Physics, Particles & Fields
E. Rubin de Celis, C. Simeone
Summary: This study investigates the possibility of traversing thin shells, focusing on the variation in tides associated with different global properties of the geometries. It was found that the previously problematic curvature jumps across infinitely thin shells can be significantly reduced or even eliminated in shells joining an inner with an outer submanifold of spacetimes with one asymptotic region. It is also shown that cylindrical shells have an advantage over spherical shells within this framework.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Harold White, Jerry Vera, Arum Han, Alexander R. Bruccoleri, Jonathan MacArthur
Summary: Through analysis related to a DARPA-funded project, a micro/nano-scale structure has been discovered that predicts negative energy density distribution closely matching requirements for the Alcubierre metric. Numerical evaluation and model analysis indicate the existence of a three-dimensional energy density in a Casimir cavity that correlates well with the requirements of the Alcubierre warp metric.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Ahmed Farag Ali, Emmanuel Moulay, Kimet Jusufi, Hassan Alshal
Summary: From a geometric perspective, this article demonstrates that the unitary symmetries U(1) and SU(2) can be fundamentally derived from the Schwarzschild and Reissner-Nordstrom wormhole geometries through spacetime complexification. Quantum tunneling is then explored to enable particle traversal of these wormholes, leading to wormhole thermodynamics.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
S. Habib Mazharimousavi
Summary: This article revisits the null energy condition in the context of thin-shell wormholes and introduces the general and stability conditions for satisfying this condition. Additionally, a specific metric is introduced that satisfies the null energy condition and remains stable.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
G. Alencar, V. B. Bezerra, C. R. Muniz
Summary: This paper investigates that in (2+1) dimensions, wormholes cannot be sourced solely by both Casimir energy density and tension, unlike in the 4-D scenario where it has been shown that it is possible. The study shows that in 3-D spacetime, the arising of at least an event horizon is inevitable. Introducing a cosmological constant and applying a perpendicular weak magnetic field can circumvent this restriction and contribute to the formation of the wormhole.
EUROPEAN PHYSICAL JOURNAL C
(2021)
