Article
Astronomy & Astrophysics
R. Bufalo, T. Cardoso e Bufalo
Summary: The paper discusses vacuum Cherenkov radiation in z = 2 Lifshitz electrodynamics, highlighting the importance of improved ultraviolet behavior and renormalizable couplings due to time-space anisotropic scaling. The study evaluates the instantaneous rate of energy loss for a charge and analyzes the emission of very soft photons in this framework.
Article
Astronomy & Astrophysics
M. Gomes, J. G. Lima, T. Mariz, J. R. Nascimento, A. Yu. Petrov
Summary: In this paper, we demonstrate the possibility of generating a non-Abelian Carroll-Field-Jackiw (CFJ) term in the theory of a non-Abelian gauge field coupled to a spin-3/2 field in the presence of the constant axial vector field. Applying two regularization schemes, we prove that this term is finite and ambiguous, particularly vanishing within the 't Hooft-Veltman scheme.
Article
Physics, Multidisciplinary
Vikramaditya MondalnAff
Summary: In phenomenological studies of quantum gravity, modifying the Lorentzian dispersion relation can predict testable features of unknown Planck-scale physics. The modified equation of motion for the Dirac field, derived from a specific scenario in generalized Hoava-Lifshitz gravity, is applied to calculate the amplitude for Coulomb scattering in the non-relativistic limit. The resulting modification to the potential, dependent on particle spin, implies spinors acquiring electric dipole moment and spin coupling with the electric field generated by another charge.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Astronomy & Astrophysics
J. M. Carmona, J. L. Cortes, J. J. Relancio, M. A. Reyes
Summary: The kinematics of three-body decay with modified energy-momentum relation due to Lorentz invariance violation is extensively discussed using the collinear approximation. The results are applied to the decay of superluminal neutrinos, producing electron-positron or neutrino-antineutrino pairs. Explicit expressions for energy distributions, necessary for studying the cascade of neutrinos generated during the propagation of superluminal neutrinos, are derived.
Article
Astronomy & Astrophysics
Dicong Liang, Rui Xu, Xuchen Lu, Lijing Shao
Summary: This study reveals the effects of Lorentz violation on gravitational waves, including modifications to their dispersion relation, induction of birefringence and anisotropy in propagation. The researchers used gauge invariants to investigate the polarizations of gravitational waves in the bumblebee gravity model and found multiple polarizations. They also discussed the differences between the bumblebee gravity model and the minimal Standard-Model Extension framework in the linearized regime.
Article
Astronomy & Astrophysics
Austin Schneider, Barbara Skrzypek, Carlos A. Arguelles, Janet M. Conrad
Summary: Many beyond Standard Model physics signatures are enhanced in high-energy neutrino interactions, which can be accessed by atmospheric neutrinos. DUNE far detectors have the potential to observe interesting beyond Standard Model signatures in the high-energy regime, providing insights into new physics that may appear in this energy window. The detectors can explore sensitivity to various scenarios, such as a sterile neutrino model and a Lorentz invariance violating standard model extension.
Article
Astronomy & Astrophysics
J. L. Chkareuli
Summary: The article reconsiders the scenario in which photons and other gauge fields appear as composite vector bosons made of fermion pairs, discussing the constraints and transformations of composite models, as well as the possible connection between these composite bosons and preons of known quark-lepton species.
Article
Physics, Particles & Fields
R. Maluf, Juliano C. S. Neves
Summary: This article points out the effect of Lorentz symmetry breaking in the cosmological context, which leads to different rates of expansion in a given spatial direction. It focuses on the coupling constant xi(1), which generates the Lorentz violation in the gravity sector of the minimal Standard Model Extension. The coupling constant increases the rate of expansion of the universe in a given direction during a dark energy era, and a range of validity for this constant is obtained.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
E. Kapsabelis, P. G. Kevrekidis, P. C. Stavrinos, A. Triantafyllopoulos
Summary: In this work, the authors extend the study of Schwarzschild-Finsler-Randers (SFR) spacetime, investigating the energy and angular momentum derivation of a particle moving along a geodesic. The study compares the model to general relativity (GR) and examines the effective potential and phase portraits. The derivation of the deflection angle of the SFR spacetime is also explored and compared to GR, revealing small differences.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
F. P. Poulis, M. A. C. Soares
Summary: This work explores the Lorentz symmetry violation induced by a bumblebee field in the context of the standard-model extension. The mathematical formulation and dynamical equations of the generic bumblebee model are presented, focusing on the vacuum scenario. A simplified method to find solutions to the model is developed, providing explicit effects of the bumblebee field on the spacetime description. The implications of the bumblebee field on Schwarzschild and rotating spacetimes are investigated, yielding both previously known and new solutions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Review
Astronomy & Astrophysics
Ping He, Bo-Qiang Ma
Summary: As a fundamental symmetry of space-time, Lorentz symmetry plays a crucial role in physics. Despite withstanding rigorous tests, the question of whether Lorentz symmetry breaks still remains and attracts physicists to study Lorentz symmetry violation (LV) through theoretical considerations and experimental feasibility. There are various theoretical models that include LV effects and predict different phenomena, allowing for verification and constraint of LV effects. High-energy particles from astronomical sources, particularly cosmic photons, are utilized for LV phenomenological research due to their energy and long propagation distance. Various astronomical observations provide rich data for obtaining constraints on LV effects of photons.
Article
Astronomy & Astrophysics
Justo Lopez-Sarrion, Carlos M. Reyes, Cesar Riquelme
Summary: This study investigates the higher-order effects of CPT and Lorentz violation within the framework of the Standard-Model Extension, focusing on the inclusion of Myers-Pospelov dimension-five operator terms. The study quantizes the model canonically while paying special attention to the emergence of indefinite-metric states or ghosts in an indefinite Fock space. It addresses the preservation of unitarity and microcausality, showing that microcausality is preserved through the cancellation of residues occurring in pairs or conjugate pairs when they become complex. The study also demonstrates that the S matrix can be perturbatively defined as unitary for tree-level 2 -> 2 processes with an internal fermion line by using the Lee-Wick prescription.
Article
Astronomy & Astrophysics
Leila Haegel, Kellie O'Neal-Ault, Quentin G. Bailey, Jay D. Tasson, Malachy Bloom, Lijing Shao
Summary: We investigate the existence of Lorentz and CPT-violating effects during gravitational wave propagation using an effective-field theory framework called the Standard Model Extension. By implementing a modified equation for the dispersion of gravitational waves, we perform a joint Bayesian inference of source parameters and spacetime-symmetry breaking coefficients. From a sample of 45 high-confidence events, we obtain maximal bounds for the isotropic coefficient and limits on the order of 10-13 m for the anisotropic coefficients.
Article
Physics, Particles & Fields
Adria Delhom, J. R. Nascimento, Gonzalo J. Olmo, A. Yu. Petrov, Paulo J. Porfirio
Summary: In this study, the metric-affine formulation of bumblebee gravity is considered, field equations are derived, and it is shown that the bumblebee field becomes coupled to other matter fields with potential nontrivial effects. By computing the post-Minkowskian, weak-field limit, the resulting effective theory is explored, coupling scalar and spinorial matter to the effective metric and investigating the physical properties of the VEV of the bumblebee field, focusing on dispersion relations and stability.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Chikun Ding, Yu Shi, Jun Chen, Yuebing Zhou, Changqing Liu, Yuehua Xiao
Summary: In this study, an exact rotating BTZ-like black hole solution is obtained by solving the gravitational field equations and bumblebee motion equations. The Lorentz symmetry is violated only in the radial direction and requires a linear functional potential for the bumblebee field. The black hole has two horizons and an ergosphere, which depend on the bumblebee coupling constant. The entropy-area relation, first law of thermodynamics, and Smarr formula can still be established in this LV spacetime due to the coupling between the bumblebee field and the Ricci tensor.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
D. Bazeia, M. Bongestab, B. F. de Oliveira
Summary: This study investigates the influence of the neighborhood in simple rock-paper-scissors models of biodiversity, showing that increasing the neighborhood significantly increases the characteristic length of the system. It also reveals the interesting phenomenon where modifying the competition method of certain species may result in the strongest individuals constituting the least abundant population.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Astronomy & Astrophysics
D. Bazeia, M. A. Liao, M. A. Marques
Summary: In this study, a Maxwell-Higgs system is coupled to a neutral scalar field with Z(2) symmetry, and the field equations at critical coupling are identified with those of an impurity-doped Maxwell-Higgs model. The impurity's form changes according to properties of the neutral scalar field, allowing for an interpretation of impurity parameters in terms of kink-like defects and a convenient way to generate impurities. Novel vortices with unique internal structures were found by solving the first order equations, and the procedure was adapted for impurity generation in the Chern-Simons-Higgs theory.
Article
Nanoscience & Nanotechnology
Alison A. Silva, Fabiano M. Andrade, D. Bazeia
Summary: This study investigates the average scattering entropy of quantum graphs and compares its behavior in different scenarios involving vertex distribution and topology. The results show that the average scattering entropy is influenced by the number of vertices and the topological arrangement of vertices and edges, making it a useful tool for exploring topological effects in quantum systems.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Multidisciplinary
A. J. Balseyro Sebastian, D. Bazeia, M. A. Marques
Summary: We investigate the possibility of building internal structure and asymmetry for kinks and domain walls in scalar field theories in the multifield scenario. This requires including an extra field associated with a function that modifies the dynamics of the other fields. We study minimum energy configurations that support first order equations compatible with the equations of motion. The extra field allows for a transition guided by a parameter, connecting the standard solution to a geometrically constrained one, mimicking the effects of geometrical constrictions in magnetic materials.
Article
Electrochemistry
A. R. Gomes, L. A. T. Costa, M. P. A. Silva, N. S. R. Tome, D. T. Cestarolli, E. M. Guerra
Summary: The energy levels of DSSCs using VO2, PANI, and various dyes were evaluated. The study found that VO2 has potential applications as an anode material in DSSCs. The energy parameters of different dyes and PANI solutions allow for the assembly of multiple combinations of DSSCs.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2022)
Article
Astronomy & Astrophysics
D. Bazeia, A. S. Lobao Jr, M. A. Marques, R. Menezes
Summary: We investigate braneworlds modeled by topological solutions that arise from the Cuscuta-Galileon model. We develop a first order framework and illustrate our procedure using the hyperbolic tangent profile of the scalar field. We find conditions for the model parameters to have solutions connecting minima of the potential and interpolating Minkowski and anti de Sitter geometries, as well as solutions only interpolating anti de Sitter geometry. In both cases, the gravity sector of the brane is stable against metric fluctuations.
Article
Mathematics, Interdisciplinary Applications
I. Andrade, D. Bazeia, M. A. Marques, R. Menezes
Summary: In this study, we investigate a Maxwell-scalar model that couples the scalar field and gauge field either through electric permittivity or in the presence of impurity. By considering one-dimensional space, we identify the conditions under which the model with impurity can be treated as an effective model for the Maxwell-scalar system, yielding similar solutions. We also explore a specific class of impurities that modifies the core of the scalar field and find the corresponding nontrivial charge densities and electric fields.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Astronomy & Astrophysics
D. Bazeia, M. A. Liao, M. A. Marques
Summary: We investigate the presence of localized structures for relativistic scalar fields coupled to impurities in arbitrary spatial dimensions. It is shown that the inclusion of explicit coordinate dependence in the Lagrangian does not strongly hinder the existence of stable solutions compared to the impurity-free scenario. We find Bogomol'nyi equations that give rise to global minima of the energy and present some BPS configurations.
Article
Astronomy & Astrophysics
Eduardo Barredo-Alamilla, Luis F. Urrutia, Manoel M. Ferreira Jr
Summary: This article examines the electromagnetic radiation in chiral matter with phonon coupling. By using the stationary phase approximation, the angular distribution of the radiated energy is derived. The Cherenkov radiation phenomenon is discussed by considering the case of a charge moving at constant velocity in the material. It is found that zero, one, or two Cherenkov cones can appear when the material's refractive index is greater than 1.
Article
Physics, Particles & Fields
D. Bazeia, M. A. Marques, M. Paganelly
Summary: This work investigates electrically charged structures localized in two and three spatial dimensions. The Maxwell-scalar Lagrangian is used to describe different systems with distinct interactions for scalar fields. The approach relies on finding first order differential equations that solve the equations of motion and ensure stability of the corresponding minimum energy solutions. The paper illustrates the various possibilities in two and three spatial dimensions, examining different examples of electrically charged solutions that have internal structure.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Materials Science, Multidisciplinary
Pedro D. S. Silva, Manoel M. Ferreira
Summary: This paper examines the optical aspects of bi-isotropic media in the presence of Ohmic and magnetic conductivity. It is found that for a bi-isotropic medium with antisymmetric magnetic conductivity, an intricate dispersive rotatory power is attained, and the handedness of the medium is reversed.
Article
Optics
Pedro D. S. Silva, Rodolfo Casana, Manoel M. Ferreira
Summary: The effects of extended constitutive relations on the propagation of waves in bi-isotropic and bi-anisotropic media are investigated using a classical general approach. The study considers different magnetoelectric parameters represented by symmetric and antisymmetric tensors and evaluates the refractive indices, propagation modes, and anisotropy/birefringence effects. The findings provide insights into the identification of the type of bi-anisotropic medium examined and discuss energy propagation in these anisotropic media.
Article
Physics, Particles & Fields
D. Bazeia, A. S. Lobao Jr
Summary: We investigate braneworld models with multiple scalar fields and generalized dynamics. The inclusion of cuscuton dynamics, using a new mechanism to control the internal structure of the brane in modified gravity, induces significant changes in the profile of the brane.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
D. Bazeia, A. S. Lobao Jr
Summary: In this work, we investigate braneworlds generated by multiple scalar fields. The study focuses on the necessary formalism to examine models and evaluate the stability conditions of the gravitational sector under linear perturbations. Specifically, we develop a mechanism to explore distinct scenarios controlled by two and three fields, with a particular emphasis on how these fields can be utilized to modify the internal structure of the brane.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
D. Bazeia, M. A. Liao, M. A. Marques
Summary: This paper investigates topological vortices in relativistic gauge theories in flat three-dimensional spacetime. By introducing complex scalar fields and generalized permeabilities, the features of static, finite energy solutions within this class of models are analyzed in detail, along with the effect of winding numbers on the magnetic properties of each subsystem. A BPS bound and first order equations are also introduced for a particular class of models, and specific models are solved to find solutions with distinct features compared to the standard Nielsen-Olesen vortex.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Mathematics, Applied
Melanie Kobras, Valerio Lucarini, Maarten H. P. Ambaum
Summary: In this study, a minimal dynamical system derived from the classical Phillips two-level model is introduced to investigate the interaction between eddies and mean flow. The study finds that the horizontal shape of the eddies can lead to three distinct dynamical regimes, and these regimes undergo transitions depending on the intensity of external baroclinic forcing. Additionally, the study provides insights into the continuous or discontinuous transitions of atmospheric properties between different regimes.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Shu-hong Xue, Yun-yun Yang, Biao Feng, Hai-long Yu, Li Wang
Summary: This research focuses on the robustness of multiplex networks and proposes a new index to measure their stability under malicious attacks. The effectiveness of this method is verified in real multiplex networks.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Julien Nespoulous, Guillaume Perrin, Christine Funfschilling, Christian Soize
Summary: This paper focuses on optimizing driver commands to limit energy consumption of trains under punctuality and security constraints. A four-step approach is proposed, involving simplified modeling, parameter identification, reformulation of the optimization problem, and using evolutionary algorithms. The challenge lies in integrating uncertainties into the optimization problem.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Alain Bourdier, Jean-Claude Diels, Hassen Ghalila, Olivier Delage
Summary: In this article, the influence of a turbulent atmosphere on the growth of modulational instability, which is the cause of multiple filamentation, is studied. It is found that considering the stochastic behavior of the refractive index leads to a decrease in the growth rate of this instability. Good qualitative agreement between analytical and numerical results is obtained.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Ling An, Liming Ling, Xiaoen Zhang
Summary: In this paper, an integrable fractional derivative nonlinear Schrodinger equation is proposed and a reconstruction formula of the solution is obtained by constructing an appropriate Riemann-Hilbert problem. The explicit fractional N-soliton solution and the rigorous verification of the fractional one-soliton solution are presented.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Marzia Bisi, Nadia Loy
Summary: This paper proposes and investigates general kinetic models with transition probabilities that can describe the simultaneous change of multiple microscopic states of the interacting agents. The mathematical properties of the kinetic model are proved, and the quasi-invariant asymptotic regime is studied and compared with other models. Numerical tests are performed to demonstrate the time evolution of distribution functions and macroscopic fields.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Carlos A. Pires, David Docquier, Stephane Vannitsem
Summary: This study presents a general theory for computing information transfers in nonlinear stochastic systems driven by deterministic forcings and additive and/or multiplicative noises. It extends the Liang-Kleeman framework of causality inference to nonlinear cases based on information transfer across system variables. The study introduces an effective method called the 'Causal Sensitivity Method' (CSM) for computing the rates of Shannon entropy transfer between selected causal and consequential variables. The CSM method is robust, cheaper, and less data-demanding than traditional methods, and it opens new perspectives on real-world applications.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Feiting Fan, Minzhi Wei
Summary: This paper focuses on the existence of periodic and solitary waves for a quintic Benjamin-Bona-Mahony (BBM) equation with distributed delay and diffused perturbation. By transforming the corresponding traveling wave equation into a three-dimensional dynamical system and applying geometric singular perturbation theory, the existence of periodic and solitary waves are established. The uniqueness of periodic waves and the monotonicity of wave speed are also analyzed.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Wangbo Luo, Yanxiang Zhao
Summary: We propose a generalized Ohta-Kawasaki model to study the nonlocal effect on pattern formation in binary systems with long-range interactions. In the 1D case, the model displays similar bubble patterns as the standard model, but Fourier analysis reveals that the optimal number of bubbles for the generalized model may have an upper bound.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Corentin Correia, Ana Cristina Moreira Freitas, Jorge Milhazes Freitas
Summary: The emergence of clustering of rare events is due to periodicity, where fast returns to target sets lead to a bulk of high observations. In this research, we explore the potential of a new mechanism to create clustering of rare events by linking observable functions to a finite number of points belonging to the same orbit. We show that with the right choice of system and observable, any given cluster size distribution can be obtained.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Enyu Fan, Changpin Li
Summary: This paper numerically studies the Allen-Cahn equations with different kinds of time fractional derivatives and investigates the influences of time derivatives on the solutions of the considered models.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Yuhang Zhu, Yinghao Zhao, Chaolin Song, Zeyu Wang
Summary: In this study, a novel approach called Time-Variant Reliability Updating (TVRU) is proposed, which integrates Kriging-based time-dependent reliability with parallel learning. This method enhances risk assessment in complex systems, showcasing exceptional efficiency and accuracy.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Chiara Cecilia Maiocchi, Valerio Lucarini, Andrey Gritsun, Yuzuru Sato
Summary: The predictability of weather and climate is influenced by the state-dependent nature of atmospheric systems. The presence of special atmospheric states, such as blockings, is associated with anomalous instability. Chaotic systems, like the attractor of the Lorenz '96 model, exhibit heterogeneity in their dynamical properties, including the number of unstable dimensions. The variability of unstable dimensions is linked to the presence of finite-time Lyapunov exponents that fluctuate around zero. These findings have implications for understanding the structural stability and behavior modeling of high-dimensional chaotic systems.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Christian Klein, Goksu Oruc
Summary: A numerical study on the fractional Camassa-Holm equations is conducted to construct smooth solitary waves and investigate their stability. The long-time behavior of solutions for general localized initial data from the Schwartz class of rapidly decreasing functions is also studied. Additionally, the appearance of dispersive shock waves is explored.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
Article
Mathematics, Applied
Vasily E. Tarasov
Summary: This paper extends the standard action principle and the first Noether theorem to consider the general form of nonlocality in time and describes dissipative and non-Lagrangian nonlinear systems. The general fractional calculus is used to handle a wide class of nonlocalities in time compared to the usual fractional calculus. The nonlocality is described by a pair of operator kernels belonging to the Luchko set. The non-holonomic variation equations of the Sedov type are used to describe the motion equations of a wide class of dissipative and non-Lagrangian systems. Additionally, the equations of motion are considered not only with general fractional derivatives but also with general fractional integrals. An application example is presented.
PHYSICA D-NONLINEAR PHENOMENA
(2024)
