Article
Astronomy & Astrophysics
Ramil N. Izmailov, Kamal K. Nandi
Summary: A possible method for observing quantum gravity effects at low energy scales is to introduce spontaneous Lorentz violation in new models of gravity. This paper examines the effects of Lorentz violation corrections in bumblebee gravity and how they differ from general relativity, particularly in the strong field lensing properties of Schwarzschild-like black holes.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Physics, Particles & Fields
Sara Kanzi, Izzet Sakalli
Summary: In the context of Lorentz symmetry breaking (LSB), the quasinormal modes (QNM) and greybody factors (GF) of the Kerr-like black hole spacetime from the bumblebee gravity model are investigated. Scalar and fermionic perturbations are analyzed using both semi-analytic WKB method and the time domain approach. The impact of LSB on the bosonic/fermionic QNM and GF of the Kerr-like black hole are examined in detail, with results depicted graphically and discussed.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Rui-Hui Lin, Rui Jiang, Xiang-Hua Zhai
Summary: The paper investigates the quasinormal modes of spherical black holes with a global monopole in the bumblebee model, which extends the Einstein-Maxwell theory to allow for the spontaneous breaking of spacetime Lorentz symmetry. The stability of these black holes under perturbation of a massless scalar field is analyzed. It is found that both the Lorentz symmetry breaking and the global monopole significantly affect the evolution of the perturbation.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Andres Gomez, A. Martin-Ruiz, Luis F. Urrutia
Summary: This study calculates the CPT odd contribution to the effective electromagnetic action arising from Lorentz invariance violation in a large class of fermionic systems using thermal field theory methods, focusing on corrections dependent on the chemical potential. The results are briefly applied to type-I tilted Weyl semimetals.
Article
Multidisciplinary Sciences
Sapan Karki, Brett Altschul
Summary: This paper extends the classical equivalence in Lorentz-violating effective field theory to the quantum level. The study generalizes the spinorial point transformations and modifies the C, P, and T operators in order to correspond to the correct interchanges of physical particle states.
Article
Physics, Particles & Fields
Reza Moazzemi, Mohammad Mehdi Ettefaghi, Amirhosein Mojavezi
Summary: This study examines topological defects in the lambda phi(4) theory in (1+1) dimensions with a Lorentz-violating background, introducing a new Lorentz-violating term at the next-to-leading order. The lowest order term affects the kink properties significantly, leading to corrections in kink shape and mass. The quantization of the kink reveals that bound and continuum states are influenced by this Lorentz symmetry violation.
Article
Physics, Multidisciplinary
M. C. Araujo, R. V. Maluf
Summary: This paper investigates the influence of nonzero temperature on the differential cross-section for mesons scattering in a Lorentz-violating extension of the scalar electrodynamics. It is found that the corrections induced on the meson scattering are very large in the high-temperature regime, and temperature effects may contribute to new constraints on the Lorentz-violating parameters.
Article
Physics, Particles & Fields
Sohan Kumar Jha, Anisur Rahaman
Summary: This study investigates a bumblebee gravity-based Kerr-like black hole in a noncommutative background, analyzing the superradiance effect and black hole shadow. The study reveals the impact of Lorentz violating parameter and NC parameter on the superradiance effect and shadow, attempting to constrain the NC parameters using data from the Event Horizon Telescope collaboration. The findings suggest that black holes associated with NC Kerr-like spacetime may present suitable candidates for astrophysical black holes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Robson A. Dantas, Herondy F. Santana Mota, Eugenio R. Bezerra de Mello
Summary: In this paper, the authors investigate the impact of Lorentz violation on the bosonic Casimir effect. They adopt a theoretical model where a real massive scalar quantum field is confined between two large parallel plates, with its dynamics governed by a modified Klein-Gordon equation that includes a Lorentz-breaking term. The authors show that the corrections to the Casimir energy and pressure strongly depend on the order of the higher derivative term, the direction of the constant vector, and the specific boundary conditions considered.
Article
Physics, Nuclear
Chikun Ding, Xiongwen Chen
Summary: This study obtains an exact slowly rotating Einstein-bumblebee black hole solution by solving the gravitational field equations for different components, establishing conditions for the existence of solutions under different cases. The effects of Lorentz symmetry breaking on black hole absorption probability are investigated, showing that the Lorentz violation constant influences the potential and absorption probability.
Article
Physics, Multidisciplinary
Bruno Arderucio Costa, Yuri Bonder, Benito A. Juarez-Aubry
Summary: Several approaches to quantum gravity suggest violations of Lorentz symmetry, and this article uses a concrete Lorentz-violating quantum field theory to study different inertial vacua. It finds that the vacua in different inertial frames are unitarily inequivalent, and particles of arbitrarily high momenta can appear in one frame but not in others. However, the article also demonstrates that inertial Unruh-De Witt detectors are insensitive to these effects, and discusses the Hadamard condition for this Lorentz-violating theory.
Article
Spectroscopy
Jialing Shi, Lili Ju, Xin Zhang, Yingzhou Huang, Yurui Fang
Summary: Nanogaps in nanooptics play a crucial role in enhancing electromagnetic field redistribution, which leads to various applications such as light manipulation, light harvesting, and surface enhanced spectrum. The study on gap modes of dielectric nanoparticle dimer on metal film provides insights into abnormal electric field enhancement and is further analyzed using mode hybridization theory. Experimental demonstration through surface enhanced Raman spectroscopy validates the theoretical analyses.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Physics, Multidisciplinary
Zhi-E Liu, Xia Tan, Jie Zhang, Shu-Zheng Yang
Summary: The quantum tunneling radiation of spin 1/2 fermions in Kerr anti-de-Sitter black holes was studied, with corrections made to the dynamic equation using Lorentz's violation theory. New expressions were obtained for the fermions quantum tunneling rate, black hole's Hawking temperature, and black hole's entropy. It was found that the Hawking temperature increases with the enhancement of coupling strength and radial component of ether-like field, independent of non-radial components.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Physics, Nuclear
Andrea Erdas
Summary: The study investigates the finite temperature Casimir effect caused by a massive and charged scalar field with Lorentz invariance broken. By utilizing the zeta-function technique, accurate analytic expressions of thermal corrections to Casimir energy and pressure are obtained for different Lorentz asymmetry cases. The results show a strong dependence of these corrections on the direction of the unit vector breaking the Lorentz symmetry.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
Article
Physics, Multidisciplinary
Hui-Min Wang, Shao-Wen Wei
Summary: This paper tests the Lorentz symmetry in Einstein-bumblebee gravity by observing the shadow of a Kerr-like black hole with or without plasma. The results show a nonmonotonic behavior of the shadow radius with the Lorentz-violating parameter. Three additional distortion observables are calculated and found to increase with the Lorentz-violating parameter. The impact of the Lorentz-violating parameter on the deflection angle of light rays and the motion of photons in a plasma are also analyzed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Multidisciplinary
F. C. E. Lima, C. A. S. Almeida
Summary: In this work, an exponentially generalized Abelian model is proposed to investigate vortex structures in models coupled to Maxwell and Chern-Simons fields. The dynamics of the complex scalar field in models coupled separately to the Maxwell term and the Chern-Simons term are analyzed using Bogomol'nyi equations. It is found that scalar field solutions generate degenerate minimum energy configurations in Maxwell's case and degenerate solutions in the Chern-Simons case.
Article
Astronomy & Astrophysics
A. R. P. Moreira, F. C. E. Lima, C. A. S. Almeida
Summary: In this study, we investigate a five-dimensional thick brane in the teleparallel f(T) gravity scenario. This scenario is interesting as it can explain inflation, radiation, and dark matter phenomena under certain conditions. We assume a polynomial profile of the function f(T) for convenience, and some polynomial profiles can produce brane splitting. Geometrically contracted matter field configurations are obtained for functions f(T) with this capability. The stability of the brane is analyzed using Configurational Entropy (CE), which helps to identify the best profile of the function f(T).
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2023)
Article
Nanoscience & Nanotechnology
F. C. E. Lima, L. N. Monteiro, C. A. S. Almeida
Summary: In this work, we study the Dirac equation in the position-dependent mass (PDM) scenario, investigating the quantum dynamics of non-Hermitian fermionic particles with effective mass assuming flat spacetime. We introduce a complex potential to achieve PT symmetry and explore the resulting effective potential purely dependent on mass distribution. The non-relativistic limit and specific cases of mass distribution are also examined, revealing intriguing phenomena such as the emergence of bound states and the behavior of fermions as free particles with positive-defined energy.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Physics, Multidisciplinary
F. C. E. Lima, A. R. P. Moreira, C. A. S. Almeida, C. O. Edet, N. Ali
Summary: In this research article, the quantum information entropy of a particle trapped by the Aharonov-Bohm-type field is investigated using Shannon's formalism. To study quantum information, the eigenstates of the quantum system, i.e. the wave functions and energies of the quantum states, need to be investigated. It is assumed that the particle is confined in a cylindrical box in the presence of Aharonov-Bohm-type effect due to dislocation defect. The analysis of quantum information entropy reveals that the dislocation influences the eigenstates and the quantum information of the system.
Article
Astronomy & Astrophysics
F. M. Belchior, A. R. P. Moreira, R. V. Maluf, C. A. S. Almeida
Summary: This paper investigates the localization of the Elko spinor field using a Yukawa-like geometrical coupling. The first-order formalism with sine-Gordon and linear superpotentials is adopted to obtain the warp factors in braneworld scenarios. The trapping of zero modes and the existence of real-valued massive modes are explored through the Schrodinger-like approach.
Article
Physics, Multidisciplinary
F. C. E. Lima, A. R. P. Moreira, C. A. S. Almeida
Summary: This study investigates the influence of matter field and gauge field on the metric functions of the AdS(3) spacetime in the Maxwell-Higgs model. The appearance of black hole solutions is noticed with the presence of a matter field with a solitonic profile that can adjust the field variable. The compactification of the matter field affects the metric functions while not changing the structure of the magnetic black hole vortex horizon.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
Francisco Estevao E. Lima, Carlos Alberto S. Almeida
Summary: This study investigates the kink-like solutions of the matter field in a 2D dilaton gravity scenario, analyzing their stability and topological structures. The results show that the nature of the structures in the system needs to be confirmed through a differential configurational complexity (DCC) analysis.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
A. R. P. Moreira, F. M. Belchior, R. V. Maluf, C. A. S. Almeida
Summary: This paper investigates the influence of torsion on bulk fields in a thick brane with codimension two in f(T) modified teleparallel gravity. The localization of gauge field zero mode is supported by the brane without the need for an extra coupling. However, Kalb-Ramond and fermionic fields require appropriate couplings. Therefore, a geometrical coupling based on results in 5D thick brane in modified teleparallel gravities is proposed. The Kalb-Ramond field is coupled to torsion scalar T through a gauge-invariant interaction, and for fermionic fields, the Dirac fermions and gravitino are studied with a derivative geometrical coupling. Massive and resonant modes are obtained for all fields using a Schodinger-like approach.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
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
F. M. Belchior, A. R. P. Moreira, R. V. Maluf, C. A. S. Almeida
Summary: In this paper, we investigate the influence of torsion scalar T and boundary term B on the confinement of both the gauge vector and Kalb-Ramond fields in modified teleparallel gravity. We propose a Stueckelberg-like geometrical coupling that non-minimally couples the fields to the torsion scalar and boundary term. We use the first-order formalism and two kinds of superpotential to set up our braneworld models. The geometrical coupling is used to produce a localized zero mode, and we analyze the massive spectrum for both fields to obtain possible resonant massive modes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
A. R. P. Moreira, F. M. Belchior, R. V. Maluf, C. A. S. Almeida
Summary: This paper investigates the behavior of gauge vector and tensor fields on thick brane in f(T) gravity. The thick brane does not provide a normalizable zero mode for gauge and Kalb-Ramond fields. To solve this, two types of gauge-invariant couplings are proposed. Resonant modes are also studied to understand the massive spectrum of fields.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
F. C. E. Lima, C. A. S. Almeida
Summary: In this study, a multi-field theory with canonical and non-canonical contributions is built, and the topological solitons of the O(3)-sigma model are investigated. The results reveal that the solitons have an internal structure and ring-like profile, which are directly related to the contribution of the cuscuton-like term.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
C. A. S. Almeida, W. T. Cruz, R. Maluf, A. Yu Petrov, P. Porfirio
Summary: In this study, the higher-derivative massive gravity in D-dimensional space-time is investigated. The mass term is introduced by a 2-brane embedded in a 4D Minkowski spacetime. The effect of a resonance mass term from the DGP braneworld model is considered. Additionally, the gravitational Chern-Simons and Ricci-Cotton terms are added to the model and the graviton propagator is evaluated using a basis of Barnes-Rivers spin projectors. The consistency of the model, dispersion relations, and causality and unitarity are discussed based on the obtained propagator.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
F. C. E. Lima, A. Yu Petrov, C. A. S. Almeida
Summary: In this work, a possible description for the quantum dynamics of cuscuton within the sigma-model approach is presented. Perturbative corrections and divergences are studied, followed by an investigation into the existence of topological structures in the cuscutonlike model. Numerical methods are used to find kinklike configurations and vortex solutions. The study shows the existence of localized energy and quantized magnetic flux in the topological sectors.
