Article
Astronomy & Astrophysics
Yu Sang, Qing-Guo Huang
Summary: Oscillons are long-lived, localized, oscillating nonlinear excitations of a real scalar field that can be abundantly produced during preheating after inflation. The first (3 + 1)-dimensional simulation for oscillon formation during preheating with noncanonical kinetic terms, such as the Dirac-Born-Infeld form, shows that the formation of oscillons is significantly influenced by the noncanonical effect.
Article
Astronomy & Astrophysics
Sayantani Lahiri
Summary: In this paper, we generalize the constant-roll inflation to the noncanonical set-up by studying scalar Dirac-Born-Infeld (DBI) theory. Under the assumption of a constant speed of sound for scalar fluctuations, we obtain exact inflationary solutions under constant-roll conditions. Finally, we use observational data from Planck and WMAP to place a constraint on the DBI constant-roll parameter.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
Meysam Motaharfar, Rudnei O. Ramos
Summary: Research suggests that a low sound speed parameter in warm inflation can mitigate the growing function in the scalar of curvature power spectrum, potentially pushing warm inflation into the strong dissipation regime and easing the theoretical constraints on cold DBI inflation. These findings, combined with recent results on swampland criteria, indicate that warm inflation may be consistently embedded in string theory.
Article
Astronomy & Astrophysics
P. De Fabritiis, P. C. Malta, J. A. Helayel-Neto
Summary: This work extends the U(1)Y sector of the Standard Model and investigates the quartic effective interactions between neutral gauge bosons. It studies the effects of high-energy processes that result in three photons, namely Z-boson decay and electron-positron annihilation. Current experimental data does not provide reliable lower bounds on the mass parameter p, but it is estimated that future e-e thorn colliders can exclude a certain range of p values with better statistics. The study also discusses neutral gauge-boson scatterings and relates the findings to recent results on anomalous quartic gauge couplings.
Article
Astronomy & Astrophysics
Peng Wang, Houwen Wu, Haitang Yang
Summary: This study explores the phenomenon of spontaneous scalarization in the EBIS model, revealing two types of scalarized black hole solutions: scalarized RN-like and scalarized Schwarzschild-like solutions. Contrary to the EMS model, the behavior of scalarized solutions in the EBIS model shows significant differences, particularly in the domain of existence and entropy of scalarized Schwarzschild-like solutions.
Article
Mathematics
Jaroslaw Mederski, Alessio Pomponio
Summary: Using variational methods, this paper seeks non-trivial solutions to a problem involving the function a and continuous nonlinearity g. The growth conditions of g at 0 and infinity are considered, along with the behavior of a as it approaches 1-. The paper successfully finds a radial solution with finite energy.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2023)
Article
Astronomy & Astrophysics
V. C. Tavares, C. J. A. P. Martins
Summary: The study concludes that the potential in these models needs to be extremely flat, and the dark energy equation of state deviates within 95.4% confidence levels for the rolling tachyon and Chaplygin components.
Article
Physics, Multidisciplinary
Dileep P. Jatkar, Upamanyu Moitra
Summary: We revisit the Dirac-Born-Infeld-like boundary counter-term for the four-dimensional theory of gravity and show that it accurately subtracts the background for both asymptotically Anti-de Sitter and asymptotically flat geometries. By studying local thermodynamics on the cut-off surface, we can reproduce dyonic black hole thermodynamics with both types of asymptotics.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Article
Physics, Particles & Fields
Diego Julio Cirilo-Lombardo
Summary: A new Weyl Born Infeld model is proposed, based on the formalism for the mathematical description of conformal gravity using local twistor geometry. Similar to the pure Maxwell case, the electromagnetic field is naturally incorporated into this scheme by modifying the local twistor parallel transport law. The dynamical equations for gravity and the electromagnetic field can only be obtained by imposing a geometric condition on a particular function of the invariants.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Ke Yang, Bao-Min Gu, Yu-Peng Zhang
Summary: A spinning test particle in the Eddington-inspired Born-Infeld gravity near an electrically charged black hole is studied. It is found that the orbital eccentricity decreases with an increase in the deviation parameter. The observed orbits with large radii do not provide stringent constraints. The parameters of the innermost stable circular orbit decrease monotonically with the deviation parameter when the spin angular momentum is small, but they have a non-monotonic behavior when the spin is large enough.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
F. T. Falciano, M. L. Penafiel, J. C. Fabris
Summary: This study investigates the validity of Bekenstein's entropy bound for a charged black hole in the context of nonlinear electrodynamics, and finds that the bound is violated in the Born-Infeld theory.
Article
Astronomy & Astrophysics
Victor Afonso, Cecilia Bejarano, Rafael Ferraro, Gonzalo J. Olmo
Summary: The study examines a model of gravity and electromagnetism inspired by Born-Infeld, treating both fields equally through a determinantal approach in a metric-aft me formulation. Despite being in conflict with the postulates of metric gravity theories, the resulting equations can also be derived from an action combining the Einstein-Hilbert action with a minimally coupled nonlinear electrodynamics. As an example, the dynamics of a charged static black hole is solved.
Article
Physics, Multidisciplinary
D. Pinto-Ramos, K. Alfaro-Bittner, M. G. Clerc, R. G. Rojas
Summary: In chains of coupled oscillators with nonreciprocal coupling, energy can propagate through waves, pulses, and fronts, leading to convective instability between unstable and stable equilibrium. Increasing the coupling level results in the emergence of a propagative pattern, such as a traveling wave, and the self-assembly of localized structures. The pattern wavelength is characterized as a function of the coupling level, and the phase diagram has been determined to agree with numerical simulations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
G. Abbas, M. Azam, A. Ditta
Summary: This study investigates the accretion of an isotropic fluid onto a Born-Infeld black hole by formulating key parameters with the help of the barotropic equation of state and conservation laws. The spherically symmetric accretion of stiff fluid, dust fluid, quintessence fluid, and phantom fluid is analyzed, showing different trends in black hole mass change. The results indicate that the black hole mass increases for stiff fluid, dust fluid, and quintessence fluid, but decreases for phantom fluid.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Elisama E. M. Lima, Francisco A. Brito
Summary: In this paper, novel kinklike structures in a scalar field theory driven by DBI dynamics are investigated. The analytical features and linear stability of the obtained solutions are discussed through a first-order formalism and a deformation procedure. The beta-Starobinsky potential is also explored in the perspective of topological defects, and two new generalizations of the beta-Starobinsky model using the DBI approach are proposed.
Article
Physics, Multidisciplinary
J. G. G. S. Ramos, A. L. R. Barbosa, D. Bazeia, C. Lewenkopf
Summary: This paper reviews Prof. Mahir Hussein's contributions to random matrix theory and its applications to mesoscopic systems, with a focus on his recent research on conductance fluctuations of chaotic quantum dots.
BRAZILIAN JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Wesley Bueno Cardoso, Ardiley Torres Avelar, Dionisio Bazeia
Summary: This paper pays tribute to Professor Mahir Saleh Hussein and studies the propagation of solitons in nonlinear coupled waveguides. It introduces quasi-periodic nonlinear couplings by merging components to change the nonlinearities of the system, and examines how these modifications affect the behavior of the solutions.
BRAZILIAN JOURNAL OF PHYSICS
(2021)
Article
Physics, Particles & Fields
Joao Luis Rosa, D. A. Ferreira, Dionisio Bazeia, Francisco S. N. Lobo
Summary: The study focuses on 5-dimensional braneworld scenarios within the scalar-tensor representation of the generalized hybrid metric-Palatini gravitational theory. It shows that all models are stable against small fluctuations of the metric and that the gravitational zero mode profile can be controlled by the model's parameters, particularly in the presence of an additional scalar field.
EUROPEAN PHYSICAL JOURNAL C
(2021)
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
D. Bazeia, M. A. Marques, M. Paganelly
Summary: This work presents a method to manipulate the internal structure of localized configurations of the Bloch wall type. By considering a three-field model and using a first order formalism based on energy minimization, it is shown that the geometric arrangement of the Bloch wall can be changed by decoupling the third field, leading to diverse modifications of its internal structure. This procedure captures effects beyond the standard situation and can be applied in the study of magnetization in magnetic materials at the nanoscale.
EUROPEAN PHYSICAL JOURNAL PLUS
(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
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
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
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
Physics, Multidisciplinary
G. Mustafa, S. K. Maurya, Saibal Ray, Faisal Javed
Summary: In this study, we investigate the geometry of wormholes in the framework of general relativity and explore how quantum wave dark matter affects the dynamical configuration of the shell surrounding the wormhole. By using specific shape functions and introducing quantum wave dark matter, we obtain reasonable wormhole solutions and observe its effects on the stability of the shell.
Article
Physics, Multidisciplinary
Pritha Dolai, Christian Maes
Summary: Calorimetry for equilibrium systems aims to determine the energy levels' occupation and distribution by measuring thermal response, while nonequilibrium versions provide additional information on the dynamical accessibility of these states. Using calculations on a driven exclusion process, it is confirmed that a fermionic nonequilibrium steady state with exact computation of specific heat can be achieved. The divergence at zero temperature occurs when the Fermi energy and the kinetic barrier for loading and emptying are approximately equal. Additionally, a stable low temperature regime of negative specific heat appears when the kinetic barrier is density-dependent, indicating an anti-correlation between the stationary occupation's temperature-dependence and excess heat.
Article
Physics, Multidisciplinary
F. F. Nascimento, V. B. Bezerra, J. M. Toledo
Summary: We obtained the metric of the Hayward black hole surrounded by a cloud of strings, and analyzed the effects of the string cloud on the regularity of the solution and the energy conditions. Various aspects such as horizons, geodesics, effective potential, and thermodynamics were investigated. We compared the obtained results with the literature corresponding to the Hayward black hole without a string cloud.
