Article
Astronomy & Astrophysics
Luis Herrera
Summary: This passage discusses how the vorticity of world-lines of observers associated with the rotation of a massive body was reported by Lense and Thirring more than a century ago. The analysis in this paper provides a comprehensive physical picture of frame-dragging, identifying the physical quantities responsible for the vorticity in different scenarios. The observational consequences of the results are also discussed.
Article
Astronomy & Astrophysics
Asher Berlin, Diego Blas, Raffaele Tito D'Agnolo, Roni Harnik, Yonatan Kahn, Jan Schutte-Engel, Schutte Engel
Summary: This article provides a detailed treatment of electromagnetic signals generated by gravitational waves in resonant cavity experiments. The results show that cavity experiments designed for the detection of axion dark matter only need to reanalyze existing data to search for high-frequency gravitational waves. In addition, directional detection is theoretically possible through the readout of multiple cavity modes.
Article
Physics, Applied
Xiaofan Yun, Wenkui Lin, Rui Hu, Yizhang Liu, Dongmin Wu, Xinping Zhang, Zhongming Zeng, Baoshun Zhang
Summary: A magnetoelectric (ME) antenna driven by a high-overtone bulk acoustic resonator (HBAR) can enhance bandwidth through its narrow harmonic frequency interval. The floating potential architecture (FPA) significantly improves the gain and radiation efficiency of the antenna by more than 10 dB compared to the grounded setup, by exciting additional longitudinal-wave resonance and coupling with shear waves.
APPLIED PHYSICS LETTERS
(2022)
Article
Astronomy & Astrophysics
Maurizio Consoli, Alessandro Pluchino
Summary: Research suggests that the dominant CMB dipole anisotropy is caused by the specific motion of the solar system, leading to the consideration of a fundamental frame of rest associated with the entire Universe. While the group properties of Lorentz transformations ensure a connection between observers moving within this frame, the ultimate implications could be significant. Traditional physical interpretation is required to correlate the observed dragging of light in the lab with the direct CMB observations.
Article
Astronomy & Astrophysics
L. L. Williams, Nader Inan
Summary: The drag force in the background cosmological metric affects moving objects in the universe, and it can exchange momentum and energy with the gravitational field. Unlike traditional frame-dragging, cosmological inductive dragging occurs at uniform velocity, along the direction of motion, dissipating energy. This force can potentially determine the cosmological metric through local measurements on moving bodies.
Article
Biotechnology & Applied Microbiology
Yoshihiko Kakiuchi, Shinji Kuroda, Nobuhiko Kanaya, Kento Kumon, Tomoko Tsumura, Masashi Hashimoto, Chiaki Yagi, Ryoma Sugimoto, Yuki Hamada, Satoru Kikuchi, Masahiko Nishizaki, Shunsuke Kagawa, Hiroshi Tazawa, Yasuo Urata, Toshiyoshi Fujiwara
Summary: The study demonstrates that local treatment with OBP-301 has the potential to produce abscopal effects through tumor-derived EVs.
Article
Astronomy & Astrophysics
Simen Braeck
Summary: In axisymmetric, asymptotically flat spacetimes, zero angular momentum observers (ZAMOs) define a local standard of non-rotation, as evidenced by the absence of Sagnac effect for these observers. However, on a global scale, the concept of relative rotation is argued to be the only physically meaningful concept. This argument is supported by solving Einstein's equations for an approximate thin shell model and revealing that the equations only determine differences in the rotation rate of ZAMOs, establishing the concept of relative rotation globally. The interpretation of rotation in Kerr spacetime is briefly discussed in relation to this concept.
Article
Astronomy & Astrophysics
Ramin G. Daghigh, Michael D. Green
Summary: This paper derives the equations for the odd and even parity perturbations of a black hole with an electric charge within the framework of general nonlinear electrodynamics. The stability conditions in the presence of the Hodge dual of the electromagnetic field are also obtained.
Article
Astronomy & Astrophysics
Debojoti Kuzur, Ritam Mallick
Summary: Magnetars are highly magnetized neutron stars with deformed axisymmetric rotation due to a strong magnetic field. The interaction of rotation and magnetic field perturbations affects particle orbits near the star's surface, leading to non-planar trajectories depending on magnetic field strength and misalignment angle. Energy loss and gravitational wave emission from the misaligned rotator are significantly influenced by polar frame-dragging velocity, impacting the magnetosphere around the magnetar.
JOURNAL OF ASTROPHYSICS AND ASTRONOMY
(2021)
Article
Multidisciplinary Sciences
Toni Luise Meister, Yannick Bru, Maximilian K. Nocke, Rainer G. Ulrich, Jonas Schuhenn, Kathrin Sutter, Verian Bader, Konstanze F. Winklhofer, Ruth Broering, Lieven Verhoye, Philip Meuleman, Florian W. R. Vondran, Charline Camuzet, Laurence Cocquerel, Daniel Todt, Eike Steinmann
Summary: This study analyzed the impact of genetic variants of hepatitis E virus (HEV) on its replication and pathogenesis during ribavirin (RBV) treatment. It identified a single-nucleotide variant (SNV) that resulted in noninfectious virus particles and immune evasion.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Astronomy & Astrophysics
Wan Cong, Jiri Bicak, David Kubiznak, Robert B. Mann
Summary: A relativistic theory of gravity, such as general relativity, produces phenomena fundamentally different from Newton's theory, including effects like gravitomagnetism. Recent research shows that a detector placed in a slowly rotating shell can distinguish between a static nonrotating shell and a rotating shell, detecting the presence of inertial frame dragging effects even within a finite time interval when light signals cannot convey the rotation.
Article
Astronomy & Astrophysics
Cesar D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Summary: In this study, we evaluate the probability of (de)excitation and photon emission from a neutral, moving, nonrelativistic atom coupled to the quantum electromagnetic field in the presence of a thin, perfectly conducting plane (mirror). These results extend the previous findings from a scalar model to a more realistic scenario.
Review
Construction & Building Technology
Ruslan Ibragimov, Evgenij Korolev, Timur Deberdeev, Igor Dolbin
Summary: This article studies the impact of electromagnetic fields on the degradation of reinforced concrete structures, identifying two main types of radiation: ionizing and non-ionizing. Under the influence of ionizing radiation, significant changes occur in the structure of reinforced concrete, leading to a loss of strength. Prolonged exposure to non-ionizing radiation also causes corrosion in reinforced concrete structures.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Review
Polymer Science
Suji Mary Zachariah, Tinu Antony, Yves Grohens, Sabu Thomas
Summary: This article discusses the use of industrial by-products and bio-wastes as raw materials to eliminate the adverse environmental impacts of solid waste and to synthesize shielding materials. It covers the sources, effects and mechanisms of electromagnetic radiation, as well as the factors affecting EMI shielding. This review opens up new opportunities for upcycling waste materials into efficient shielding materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Review
Biochemistry & Molecular Biology
Angel Acevedo-Del-Castillo, Ernesto Aguila-Toledo, Santiago Maldonado-Magnere, Hector Aguilar-Bolados
Summary: This paper discusses the use of polymer nanocomposites to attenuate high-energy electromagnetic radiation, focusing on the effectiveness of compounds with high atomic number like lead and low-toxicity compounds like bismuth, as well as the superior performance of nanosized particles compared to micro-sized particles.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Astronomy & Astrophysics
Luis Herrera
Summary: This passage discusses how the vorticity of world-lines of observers associated with the rotation of a massive body was reported by Lense and Thirring more than a century ago. The analysis in this paper provides a comprehensive physical picture of frame-dragging, identifying the physical quantities responsible for the vorticity in different scenarios. The observational consequences of the results are also discussed.
Article
Astronomy & Astrophysics
M. A. Alcoforado, W. O. Barreto, H. P. de Oliveira
Summary: In this study, the spectral domain decomposition technique combined with the Galerkin-Collocation method was systematically implemented in specific situations, with a focus on the spherical collapse of a scalar field in the characteristic formulation. The discussion included the importance of transmission conditions at the interface of contiguous subdomains for the domain decomposition technique applied to hyperbolic problems. Codes with an arbitrary number of subdomains were successfully implemented and validated, particularly in the context of critical collapse where Choptuik's scaling law and its oscillatory component were obtained with modest resolution.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Editorial Material
Physics, Multidisciplinary
Luis Herrera
Article
Physics, Multidisciplinary
Luis Herrera, Alicia Di Prisco, Justo Ospino
Summary: This study examines fluid distributions with hyperbolic symmetry, which resemble Lemaitre-Tolman-Bondi (LTB) solutions in many aspects. It explores both pure dust models and dissipative models with anisotropic pressure, finding that models with a vanishing complexity factor are necessarily nondissipative and satisfy the stiff equation of state.
Article
Astronomy & Astrophysics
M. A. Alcoforado, W. O. Barreto, H. P. De Oliveira
Summary: This paper presents a simple domain decomposition code based on the Galerkin-Collocation method for solving the field equations of the Bondi problem. The algorithm is stable, exhibits exponential convergence when considering the Bondi formula as an error measure, and is computationally economical. The code is applied to demonstrate the decay and power-law decay of the Bondi mass, as well as the determination of waveforms at future null infinity connected with distinct initial data.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2022)
Article
Physics, Multidisciplinary
W. Barreto, R. da Rocha
Summary: This study investigates the gravitational collapse in asymptotically AdS spacetimes using the differential configurational entropy (DCE). It is shown that the DCE complies with the instability of the Einstein-Klein-Gordon system, leading to different stages in the route to turbulence and the final black hole formation, including near the critical behavior.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Multidisciplinary
W. Barreto, A. Herrera-Aguilar, R. da Rocha
Summary: This paper investigates a family of deformed models generated by twisting the sine-Gordon model. The 3-sine-Gordon model is specifically addressed, and the differential configurational entropy and complexity of three topological sectors are discussed using two complementary approaches. Stability aspects are also considered.
Article
Astronomy & Astrophysics
R. Casadio, R. da Rocha, P. Meert, L. Tabarroni, W. Barreto
Summary: Two types of information entropy in the quantum states of a black hole's matter core are studied. The quantum mechanical picture of a collapsing ball of dust in general relativity, including a non-trivial ground state and a spectrum of bound states, is described. Computed information entropies shed new light on the stability of the ground state and the spectrum of higher excited states.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Multidisciplinary Sciences
Luis Herrera, Alicia Di Prisco, Justo Ospino
Summary: This article searches for exact analytical solutions to spherically symmetric dissipative fluid distributions that satisfy the vanishing expansion condition (vanishing expansion scalar Theta). To achieve this, additional restrictions are imposed to allow integration of the field equations. The solutions are analyzed, and possible applications to astrophysical scenarios as well as alternative approaches to obtaining new solutions are discussed.
Article
Astronomy & Astrophysics
Romulo Rougemont, Willians Barreto
Summary: We analyze the time evolution of various physical observables in a Bjorken expanding strongly coupled plasma. Transient violations of energy conditions are observed when the plasma is far from the hydrodynamic regime, and these violations become stronger with higher mu/T values. A correlation is observed between the energy conditions violations and plateau structures in the entropy. The hydrodynamization of the pressure anisotropy and the thermalization of the scalar condensate are delayed as mu/T increases towards criticality.
Article
Astronomy & Astrophysics
W. Barreto, R. da Rocha
Summary: This article examines the gravitational instability of kinks by computing and examining the differential configurational entropy for globally perturbed static kinks and far-from-equilibrium kink solutions. It identifies critical values and supercritical ranges related to phase transitions and black hole formation.
Article
Astronomy & Astrophysics
Romulo Rougemont, Willians Barreto, Jorge Noronha
Summary: In this study, we investigate the hydrodynamization times for an ensemble of far-from-equilibrium solutions of the N = 4 supersymmetric Yang-Mills plasma undergoing Bjorken flow. We find that the hydrodynamization time associated with the convergence of pressure anisotropy to the hydrodynamic attractor is similar to the Navier-Stokes result, while both are shorter than the hydrodynamization time associated with second-order hydrodynamics. Additionally, we observe that the entropy density of the different solutions transitions to second-order hydrodynamics before reaching the Navier-Stokes regime. We establish a clear hierarchy between the average hydrodynamization times for the analyzed initial data of the Bjorken expanding fluid.
Article
Astronomy & Astrophysics
Romulo Rougemont, Jorge Noronha, Willians Barreto, Gabriel S. Denicol, Travis Dore
Summary: In a strongly coupled N = 4 supersymmetric Yang-Mills plasma undergoing hydrodynamization, violations of the dominant and weak energy conditions can occur due to dynamically driven processes, as well as from a period of vanishing entropy production in far-from-equilibrium stages. These violations, which are not possible in a classical description, suggest that quantum effects in transport can lead to new phenomena in these regimes, even for systems without anomalies or spin.
Article
Astronomy & Astrophysics
M. A. Alcoforado, R. F. Aranha, W. O. Barreto, H. P. de Oliveira
Summary: The study presents a high-performance and simplified version of the code RIO for the generalized BSSN formulation, achieving exponential convergence for constraints and accuracy close to machine precision. It is based on the Galerkin-Collocation method and is continuously developed as an open-source code for more general and realistic problems.
Article
Multidisciplinary Sciences
Luis Herrera, Alicia Di Prisco, Justo Ospino
Summary: The study focuses on dissipative fluid distributions with hyperbolical symmetry, revealing the negative energy density and the inaccessibility of the central region. The inner region is described by a vacuum cavity around the center, and interesting thermodynamical properties are found through a causal transport equation. Several exact analytical solutions, evolving in a quasi-homologous regime and satisfying the vanishing complexity factor condition, are presented.
