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Texture zeros for lepton flavor mixing Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-18 Shun Zhou
The strong mass hierarchy, flavor mixing pattern and CP violation in the quark sector have been long-standing puzzles in the Standard Model. Thanks to the elegant neutrino oscillation experiments in the past few decades, now we know that neutrinos are massive and lepton flavor mixing is significant. The flavor puzzles have extended to the lepton sector. In this article, we explain how the idea of texture
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Relativistic spin-0 Duffin–Kemmer–Petiau equation in Bonnor–Melvin–Lambda solution Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-18 Faizuddin Ahmed, Abdelmalek Bouzenada
In this paper, we conduct a comprehensive exploration of the relativistic quantum dynamics of spin-0 scalar particles, as described by the Duffin–Kemmer–Petiau (DKP) equation, within the framework of a magnetic space-time. Our focus is on the Bonnor–Melvin–Lambda (BML) solution, a four-dimensional magnetic universe characterized by a magnetic field that varies with axial distance. To initiate this
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Investigation of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall–Sundrum model Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-13 Bui Thi Ha Giang, Dang Van Soa, Le Mai Dung
The influence of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall–Sundrum model is evaluated in detail. The results indicate that with fixed collision energies, the total cross-sections for the production of multiple photons depend strongly on the polarization of the muon beams, the parameters of unparticle physics (the scaling dimension
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Topological interpretation of black hole phase transition in Gauss–Bonnet gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-13 C. Fairoos
Phase transitions of Einstein–Gauss–Bonnet black holes are studied using Duan’s ϕ-field topological current theory, where black holes are treated as topological defects in the thermodynamic parameter space. The kinetics of thermodynamic defects are studied using Duan’s bifurcation theory. In this picture, a first-order phase transition between small/large black hole phases is interpreted as the interchange
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Analytic expressions for quasinormal modes of the Reissner–Nordström-like black holes Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-09 Zainab Malik
The Reissner–Nordström metric encompasses three distinct interpretations: first, as a charged static black hole in the Einstein–Maxwell theory; second, within the brane world model, where the charge is construed as a tidal parameter emanating from extra dimensions; and third, in the context of the Einstein-aether theory, wherein the charge is associated with the aether parameter. Considering these
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The application of Cornell potential on determining Mass spectra of heavy quarkonium via the Nikiforov–Uvarov method Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-09 Khalid Reggab
The mass spectrum of heavy mesons using the Cornell potential is used for studying the quark–antiquark interaction. By appropriately modifying the potential parameters, the established potential models such as Kratzer’s potential and the anharmonic one are applied in the Pekeris approximation. The Schrodinger equation for the Cornell potential setting is solved in this paper via the Nikiforov–Uvarov
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Resurgence and self-completion in renormalized gauge theories Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-04 Alessio Maiezza, Juan Carlos Vasquez
Under certain assumptions and independent of the instantons, we show that the logarithm expansion of dimensional regularization in quantum field theory needs a nonperturbative completion to have a renormalization group flow valid at all energies. Then, we show that such nonperturbative completion has the analytic properties of the renormalons, which we find with only a marginal reference to diagrammatic
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Revisiting Trimaximal TM2 mixing in two A4 modular symmetries Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-04-04 Han Zhang, Ye-Ling Zhou
In this paper, we discuss a minimal lepton flavor model with two modular A4 symmetries, one acting on neutrinos and the other acting on charged leptons. Two corresponding moduli fields are restricted at stabilizers. To avoid vanishing or degenerate lepton masses, the stabilizer in the charged lepton sector always preserves a Z3 symmetry, and that in the neutrino preserves a Z2 symmetry. By scanning
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White dwarf cooling in f(R,T) gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-27 Snehasish Bhattacharjee
In recent times, astounding observations of both over- and under-luminous type Ia supernovae have emerged. These peculiar observations hint not only at surpassing the Chandrasekhar limit but may also suggest potential modifications in the physical attributes of their progenitors such as their cooling rate. This, in turn, can influence their temporal assessments and provide a compelling explanation
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Nonextensive statistics and the entropy on the horizon Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-20 Mahnaz Maleki, Zahra Ebadi, Hosein Mohammadzadeh
We explore the application of nonextensive Bose statistics to describe the behavior of an ideal gas near the horizon of black holes, presenting a compelling case for its efficacy as an effective theory for interacting bosons. The central focus is on the careful selection of a nonextensive parameter, a critical aspect that enables the derivation of the correct entropy on the black hole horizon. Remarkably
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Vacuum pendulum test for a modified Kaluza–Klein theory Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-20 Maxime Monette, Christian Jentzsch, Matthias Kößling, Martin Tajmar
Experiments were performed in vacuum to examine a modified Kaluza–Klein theory. Originally proposed by Mbelek and Lachièze-Rey, the 5D Kaluza–Klein-ψ theory includes an external scalar field ψ to couple gravitational and electromagnetic fields and can be used to explain some misunderstood phenomena in physics. The theory predicts that a pendulum will experience detectable forces exceeding predictions
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Invariant differential operators for noncompact Lie groups: The Sp(n,1) case Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-20 N. Aizawa, V. K. Dobrev
In this paper, we continue the project of systematic construction of invariant differential operators (IDOs) on the example of the noncompact algebras sp(n,1). Our choice of these algebras is motivated by the fact that they belong to a narrow class of algebras, which are of split rank one, of which class the other cases were studied, some long time ago. We concentrate on the case n=2. We give the main
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Van der Waals black holes in rainbow gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-20 R. Oubagha, B. Hamil, M. Merad, B. C. Lütfüoğlu
Recently, Rajagopal et al. presented an asymptotically AdS black hole metric whose thermodynamics qualitatively mimics the behavior of the Van der Waals fluid by treating the cosmological constant as a thermodynamic pressure. In some studies in the literature, authors have discussed the effects of deformed algebras such as generalized and extended uncertainty principles on the thermal quantities of
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Magnetization and relativistic Landau-type quantization from Lorentz symmetry violation by fixed vector background Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-19 K. Bakke, H. Belich
From a background of the Lorentz symmetry violation determined by a fixed time-like four-vector, a nonuniform electric field and a uniform magnetic field, we show that a relativistic Landau-type quantization can be achieved. We also analyze this relativistic Landau-type system under the influence of an infinity wall. Then, from the energy eigenvalues, we discuss the magnetization and the magnetic susceptibility
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Correlation functions and stochastic Feynman rules for self-interacting scalar fields Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-18 Moongul Byun
It is well known that perturbative solutions of the Langevin equation can be used to calculate correlation functions in stochastic quantization. However, this work is challenging due to the absence of generalized rules. In this paper, we address this difficulty by studying correlation functions up to certain orders for self-interacting scalar fields. Through the perturbative approach, we establish
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Gauge coupling unification in a minimal non-supersymmetric E6 GUT Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-16 Chandini Dash, Snigdha Mishra, Sudhanwa Patra, Purushottam Sahu
We consider a minimal renormalizable non-supersymmetric E6 Grand Unified Theory using fundamental representation 27 for fermions and scalars. The scalar with adjoint representation 78 is also taken for direct breaking of E6 to SM. The proposed model, guided by TeV-scale vector-like fermions and scalar leptoquark, offers successful gauge unification even in the absence of any intermediate symmetry.
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Deconfinement to confinement by generalizing BRST symmetry on the sphere Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-16 Haresh Raval
Recently, it has been shown that the theory in the quadratic gauge on 4-sphere, 𝕊4 consists of two phases namely, the confined and the deconfined phases. A suitable finite field-dependent Becchi–Rouet–Stora–Tyutin (FFBRST) transformation interrelates two different gauge fixed theories. In this paper, we use the FFBRST technique on the curved space for the first time and elaborate a novel application
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Beam dynamics design of the superconducting section of a 100mA superconducting linac Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-14 Man Yi, Shuhui Liu, Zhijun Wang, Yu Du, Tingyue Li, Tielong Wang, Liwen Liu, Duanyang Jia, Yimeng Chu
A high-power superconducting linac with an energy of 30MeV and a beam current of 100mA has been proposed and designed. The primary challenge lies in beam loss control and a robust lattice structure to ensure stable operation. This paper discusses the physics design study, design principles and simulation results considering machine errors. Extensive multiparticle simulations (a cumulative statistic
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On the Axion Electrodynamics in a two-dimensional slab and the Casimir effect Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-12 Iver H. Brevik, Moshe M. Chaichian, Amedeo M. Favitta
We analyze the Axion Electrodynamics in a two-dimensional slab of finite width L containing a homogeneous and isotropic dielectric medium with constant permittivity and permeability. We start from the known decomposition of modes in the nonaxion case and then solve perturbatively the governing equations for the electromagnetic fields to which the axions are also coupled. This is a natural approach
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On the fractional quark–antiquark confinement and symplectic quantum mechanics Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-12 M. Abu-Shady, R. R. Luz, G. X. A. Petronilo, A. E. Santana, R. G. G. Amorim
Using the formalism of generalized fractional derivatives, a two-dimensional nonrelativistic meson system is studied. The mesons are interacting by a Cornell potential. The system is formulated in the domain of the symplectic quantum mechanics by means of the generalized fractional Nikiforov–Uvarov method. The corresponding Wigner function and the energy eigenvalues are then derived. The effect of
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The quantum model of spinning black holes Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-12 V. P. Neznamov, S. Yu. Sedov, V. E. Shemarulin
We propose a quantum model of spinning black holes with integrable ring singularities. For the charged Kerr–Newman quantum metric, the complete regularization takes place at fixing of the maximal (cut-off) energy of gravitons, kUVreg=ℏc∕RSreg. The domains of existence of one, two and several event horizons rq are shown depending on the parameters of modified Kerr and Kerr–Newman metrics.
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Closed-form bound states for two Dunkl–Liénard oscillator systems Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-12 Axel Schulze-Halberg
In this paper, we construct the general Hamiltonian for position-dependent mass systems within the Dunkl formalism. The associated Schrödinger equation is shown to admit closed-form solutions of bound state type for two particular Dunkl–Liénard systems, given by the Dunkl–Higgs oscillator, and a spiked mass Dunkl oscillator. Differences to the conventional scenario are discussed.
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Pair production of scalar fields near the accelerating Reissner–Nordstrom black hole Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-09 Haryanto M. Siahaan
Accelerating space–time is commonly utilized to depict the formation of pairs of black holes. This paper studies the pair production of charged scalar particles in the vicinity of an accelerating Reissner–Nordstrom black hole’s event horizon. Essentially, we aim to investigate the production of particles that accompanies the creation of black hole pairs. In a near extremal state, this pair production
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Cosmological constant as quantum error correction from generalized gauge invariance in double field theory Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-09 Andrei T. Patrascu
The holographic principle and its realization as the anti-de Sitter/conformal field theory (AdS/CFT) correspondence leads to the existence of the so-called precursor operators. These are boundary operators that carry nonlocal information regarding events occurring deep inside the bulk and which cannot be causally connected to the boundary. Such nonlocal operators can distinguish nonvacuum-like excitations
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Top-quark pair production by electron–positron scattering in a linearly polarized laser field Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-07 R. Chahri, S. Mouslih, M. Jakha, B. Manaut, S. Taj
In a previous paper, we showed theoretically that the total cross-section of the top-quark pair production by electron–positron annihilation is strongly reduced by the presence of a circularly polarized laser field. In this paper, we present the result for the case of a linearly polarized laser field. This time, the total cross-section is significantly enhanced by the laser field.
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Application of quantum machine learning in a Higgs physics study at the CEPC Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-07 Abdualazem Fadol, Qiyu Sha, Yaquan Fang, Zhan Li, Sitian Qian, Yuyang Xiao, Yu Zhang, Chen Zhou
Machine learning has blossomed in recent decades and has become essential in many fields. It significantly solved some problems in particle physics — particle reconstruction, event classification, etc. However, it is now time to break the limitation of conventional machine learning with quantum computing. A support-vector machine algorithm with a quantum kernel estimator (QSVM-Kernel) leverages high-dimensional
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Nonrelativistic spinless particle in vicinity of Schwarzschild-like black hole Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-06 R. G. G. Amorim, V. C. Rispoli, S. C. Ulhoa, K. V. S. Araújo
In this paper, we analyze the behavior of a nonrelativistic spinless particle near the event horizon of a Schwarzschild-like black hole. In this way, the Schrödinger covariant equation that describes the particle is obtained from the Galilean covariance technique. The Schrödinger equation in a Schwarzschild-like space–time is solved analytically and its solutions are given in terms of the confluent
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Describing the thermal radiation in Au+Au collisions at sNN=200 GeV by an analytic solution of relativistic hydrodynamics Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-06 Gábor Kasza
In high-energy heavy-ion collisions, a nearly perfect fluid, the so-called strongly coupled quark–gluon plasma (QGP), forms. After the short period of thermalization, the evolution of this medium can be described by the laws of relativistic hydrodynamics. The time evolution of the QGP can be understood through direct photon spectra measurements, which are sensitive to the entire period between the
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Nonrelativistic quantum particles interacting with pseudoharmonic-type potential under flux field in a topological defect geometry Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-06 Prabir Rudra, Faizuddin Ahmed, Houcine Aounallah
In this work, we investigate the quantum motions of nonrelativistic particles interacting with a potential in the presence of the Aharonov–Bohm (AB) flux field within a topological defect geometry, for example space–time with a distortion of a vertical line into a vertical spiral. We begin by deriving the radial Schrödinger wave equation, incorporating an anharmonic oscillator potential, which is a
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Superconductivity and color superconductivity at high Tc due to breaking of supersymmetry Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-06 Preeti Dahiya, Bharat Singh, Neelu Mahajan
The study of supersymmetric quantum theory of superconductivity has been undertaken in a broader sense. The main features of supersymmetric quantum mechanics have been derived in a straightforward manner and the consequences of supersymmetric breaking have been analyzed in terms of the possibility of occurrence of superconductivity, dual superconductivity and color superconductivity.
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The phase transition of nonminimal Yang–Mills AdS black brane Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-03-06 Mehdi Sadeghi, Faramaz Rahmani
In this paper, we shall study the phase transition of nonminimal coupling of Einstein–Hilbert gravity and electric field of Yang–Mills type in AdS space–time. We couple the Ricci scalar to the Yang–Mills invariant to obtain a modified theory of gravity. A black brane solution is introduced up to the first order of the term RFμα(a)F(a)μα in this model. Then, the phase transition of this solution will
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A mini review of baryon study at BESIII Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-28 Honghong Zhang, Weimin Song
The BESIII experiment, serving as the only operational τ-charm factory, has made significant strides in advancing our understanding of baryons. Notably, it has achieved a remarkable series of breakthroughs encompassing baryon decays, mass spectra, and production mechanisms. This mini review serves as the one-stop shop for readers who would like to know what has been studied about baryons at BESIII
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Canonical description of the tachyon kink in general background and Hamiltonian for Dp-brane-anti-Dp-brane system Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-17 J. Klusoň
In this short note, we present analysis of the tachyon kink solution on the world-volume of unstable Dp-brane in general background as the solution of the Hamiltonian equations of motion. We also find Hamiltonian for simplified system of Dp-brane and anti-Dp-brane and study its properties.
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Michelson–Morley experiments: At the crossroads of relativity, cosmology and quantum physics Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-16 Maurizio Consoli, Alessandro Pluchino
Today, the original Michelson–Morley experiment and its early repetitions at the beginning of the 20th century are considered as a venerable historical chapter for which, at least from a physical point of view, there is nothing more to refine or clarify. The emphasis is now on the modern versions of these experiments, with lasers stabilized by optical cavities, that, apparently, have improved by many
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Cosmological model in Barrow holographic dark energy with Granda–Oliveros cut-off Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-16 Pankaj, Remya A., Umesh Kumar Sharma
This study focuses on the cosmological evolution of Barrow holographic dark energy (BHDE) in a flat FLRW-universe. We take into account a time-dependent scale factor a(t)=[sinh(kt)]1n, where k and n are positive values, to find the solutions to field equations. This scale factor results in a smooth transition of the universe from its previous decelerating stage to its most recent accelerating stage
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One-loop effective action in chiral Einstein–Cartan gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-16 Pratik Chattopadhyay
In chiral Einstein–Cartan gravity, a new gauge fixing procedure is implemented recently, leading to a very economical perturbation expansion of the action. Using this formulation and the relevant gauge fixing, we develop the ghost Lagrangian on an arbitrary Einstein background using the Becchi-Rouet-Stora-Tyutin (BRST) formalism. The novelty is the appearance of a new term quadratic in the tetrad field
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Singlet scalar dark matter in the noncommutative space–time: A viable hypothesis to explain the gamma-ray excess in the galactic center Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-16 Zahra Rezaei, S. Peyman Zakeri
In this paper, we explore the noncommutative space–time to revive the idea that gamma-ray excess in the galactic center may stem from the annihilation of particle dark matter. In the noncommutative theory, the photon spectrum is produced by direct emission during this annihilation wherein a photon can be embed in the final state together with other direct products in new vertices. In the various configurations
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Investigation of hidden symmetry in AdS5 black hole with Heun equation Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-16 Jafar Sadeghi, Mohammad Ali S. Afshar, Mohammad Reza Alipour, Saeed Noori Gashti
Investigating the existence of algebra and finding hidden symmetries in physical systems is one of the most important aspects for understanding their behavior and predicting their future. Expanding this unique method of study to cosmic structures and combining past knowledge with new data can be very interesting and lead to discovering new ways to analyze these systems. However, studying black hole
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P-v criticality of charged Reissner–Nordström-de Sitter black hole under the influence of Lorentz violation theory Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-09 Y. Onika Laxmi, Ningthoujam Media, T. Ibungochouba Singh
In this paper, the modified Hawking radiation and the P-v criticality of Reissner–Nordström-de Sitter (RNdS) black hole are investigated by using Dirac equation with Lorentz violation theory in curved space–time. Taking cosmological constant as the thermodynamic pressure and its conjugate quantity as thermodynamic volume, the analogy between the RNdS black hole in the ensemble with fixed charge and
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Beyond oblique contributions: Δr and W-mass in models with scalar leptoquarks Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Carlo Marzo
In this paper, we study the dominant nonuniversal contributions to muon decay for the five scalar leptoquarks (LQs) allowed by the Standard Model gauge symmetries. By using a common computational framework, we isolate the New-Physics (NP) one-loop corrections over the observable Δr and explore the connection with the W boson mass. We highlight the role of nonuniversal terms considering, for the SU(2)
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Relativistic quantum oscillator under rainbow gravity’s effects in traversable wormhole with disclination Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Abdullah Guvendi, Faizuddin Ahmed
In this paper, our principal objective is to investigate the impact of disclination and throat radius of a three-dimensional traversable wormhole on quantum oscillator fields. Specifically, we focus on Perry–Mann-type wormhole with disclination while also considering the influence of rainbow gravity’s. We derive the radial equation of the relativistic Klein–Gordon oscillator within this wormhole background
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Thermal leptogenesis in anisotropic cosmology Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Mehran Dehpour
There is no evidence that the universe must have been homogeneous and isotropic before big bang nucleosynthesis. The Bianchi type-I cosmology is the simplest homogeneous but anisotropic cosmology. In this work, we investigate thermal leptogenesis, as a baryogenesis scenario, in the Bianchi type-I cosmology. Our results show that for specific values of the anisotropy, the modified thermal leptogenesis
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Realizations of the Yang–Poisson model on canonical phase space Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 S. Meljanac, S. Mignemi
In this paper, we discuss exact realizations of the Yang–Poisson model on canonical phase space. The Yang model is an example of noncommutative geometry on a background space–time of constant curvature and is notable for its duality between position and momentum manifolds. We call Yang–Poisson model its classical limit, with commutators replaced by Poisson brackets. The structure is simpler in the
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One continuous parameter family of Dirac–Lorentz scalar potentials associated with exceptional orthogonal polynomials Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Suman Banerjee, Rajesh Kumar Yadav
We extend our recent works [Int. J. Mod. Phys. A 38, 2350069 (2023)] and obtain one-parameter (λ) family of rationally extended Dirac–Lorentz scalar potentials with their explicit solutions in terms of Xm exceptional orthogonal polynomials. We further show that as the parameter λ→0 or −1, we get the corresponding rationally extended Pursey and the rationally extended Abraham–Moses-type of scalar potentials
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The end of space–time Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Mir Faizal
We will highlight that despite there being various approaches to quantum gravity, there are universal approach-independent features of quantum gravity. The geometry of space–time becomes an emergent structure, which emerges from some purely quantum gravitational degrees of freedom. We argue that these quantum gravitational degrees of freedom can be best understood using quantum information theory.
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General spin sums in Quantum Field Theory Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Rodolfo José Bueno Rogerio, Luca Fabbri
In Quantum Field Theory (QFT), scattering amplitudes are computed from propagators which, for internal lines, are built upon spin/polarization-sum relationships. In turn, these are normally constructed upon plane-wave solutions of the free field equations. A question that may now arise is whether such spin/polarization-sums can be generalized. In the past, there has been a first attempt at generalizing
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Axion and the SuperMassive Black Holes at high z Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Takeshi Fukuyama
Axion Dark Matter (DM) is studied on the formation of SuperMassive Black Holes (SMBH) at high red shift z. It is shown that the attractive self-interaction of this DM may resolve the tension between the large mass with high angular momentum of SMBH and its early time formation. We consider the ultra-light axion DM around O(10−21) eV as its origin, which may also cause nano-Hz stochastic gravitational
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The effect of noncommutativity on the charged 4D-EGB black hole in AdS space–time Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 H. Lekbich, A. El Boukili, Y. Sekhmani, M. B. Sedra
In this paper, we obtain a solution of a static spherically symmetric charged black hole inspired by noncommutative geometry in the context of the regularized 4D-Einstein–Gauss–Bonnet theory in AdS space. The derived metric recovers the standard solutions’ limits. It tends to the commutative case solution found in [P. G. S. Fernandes, Phys. Lett. B 805, 135468 (2020)] at large distance r+θ→∞ and the
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Associated production of J/ψ plus Z(W) in the improved color evaporation model using the parton Reggeization approach Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Alexey Chernyshev, Vladimir Saleev
In this paper, we study the associated production of prompt J/ψ mesons and Z(W) bosons in the improved color evaporation model using the high-energy factorization as it is formulated in the parton Reggeization approach. The last one is based on the modified Kimber–Martin–Ryskin–Watt model for unintegrated parton distribution functions and the effective field theory of Reggeized gluons and quarks, suggested
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Modified CPL models for dark energy and observational constraints Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-06 Gopal Sardar, Subenoy Chakraborty
In this work, we consider two modified Chevallier–Polarski–Linder (CPL) models in the background of homogeneous and isotropic Friedmann–Lemaître–Robertson–Walker (FLRW) space–time, namely, (i) the generalized CPL model (Model I) and (ii) the logarithmic form of the equation of state for the dark energy. From the observational data sets ((Pantheon+)+BAO+HST), we find that at the present epoch (redshift
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Search for new physics in semileptonic decays of K and B as implied by the g−2 anomaly in FSM Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-03 José Bordes, Chan Hong-Mo, Tsou Sheung Tsun
The framed standard model (FSM), constructed to explain, with some success, why there should be three and apparently only three generations of quarks and leptons in nature falling into a hierarchical mass and mixing pattern,10 suggests also, among other things, a scalar boson U, with mass around 17 MeV and small couplings to quarks and leptons,11 which might explain9 the g−2 anomaly reported in experiment
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Generalized hidden conformal symmetry in quadratic f(T) gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2024-02-03 Bardia H. Fahim, A. M. Ghezelbash
We find the nonextremal charged rotating charged black holes in quadratic f(T) gravity are holographically dual to two different hidden conformal field theories. The two conformal field theories can be merged to find a very general hidden conformal field theory, which is generated by the SL(2,ℤ) modular group. We also carry out the calculation to the extremal limit of the black holes, and find the
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Falsifiable analog model predictions of W mass in CDF II and ATLAS Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-12-30 R. N. C. Pfeifer
The CDF II measurement of W boson mass is at significant (6.9σ) tension with the Standard Model, and moderate (4.0σ) tension with recent results from ATLAS. Any attempt to interpret this as a signature of new physics requires high-precision, robust, falsifiable predictions. The Classical Analogue to the Standard Model In pseudo-Riemannian space–time (CASMIR) is an analogue model predicting W and Z
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The finite volume effects on the critical endpoint of chiral phase transition in Nambu–Jona-Lasinio model with different regularization schemes Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-18 Siyuan Ping, Xiaobing Zhang, Guifeng Su, Yi Zhang
In this paper, we study the influence of different regularization schemes on the critical endpoint (CEP) of chiral phase transition within a cubic box with volume V∼L3. A two-flavor Nambu–Jona-Lasinio model at finite temperature T and chemical potential μ is adopted as the effective model of the strong interacting matter. Due to the finite volume of the box, the momentum integral in gap equation is
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Scattering of evanescent particles Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-17 Robert Oeckl
Massive Klein–Gordon theory is quantized on the timelike hypercylinder in Minkowski space. Crucially, not only the propagating, but also the evanescent sector of phase space is included, laying in this way foundations for a quantum scattering theory of fields at finite distance. To achieve this, the novel α-Kähler quantization scheme is employed in the framework of general boundary quantum field theory
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Strong decay properties of single heavy baryons ΛQ, ΣQ and ΩQ Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-17 Guo-Liang Yu, Yan Meng, Zhen-Yu Li, Zhi-Gang Wang, Lu Jie
Motivated by recent progresses in experiments in searching for the Ωc baryons, we systematically analyze the strong decay behaviors of single heavy baryons ΛQ, ΣQ and ΩQ. The two-body strong decay properties of S-wave, P-wave and some D-wave states are studied with the 3P0 model. The results support assigning the recently observed Ωc(3185) and Ωc(3327) as the 2S(32+) and 1D(32+) states, respectively
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Asymmetry engendered by symmetric kink–antikink scattering in a degenerate two-field model Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-17 Fabiano C. Simas, K. Z. Nobrega, D. Bazeia, Adalto R. Gomes
In this paper, we analyze the scattering process in a two-field model in (1+1) dimensions, with the special property to have several topological solutions: (i) one with higher rest mass, characterized by a nested defect (lump inside a kink) and (ii) four others having lower rest mass, degenerated, and characterized by a kink inside kink. We investigate kink–antikink symmetric scattering, where the
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Fubini–Study geometries in the higher-dimensional gravity Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-18 A. M. Ghezelbash
We construct approximate solutions to the Einstein–Maxwell theory with uplifting the four-dimensional Fubini–Study Kähler manifold. We find the solutions can be expressed as the integrals of two special functions. The solutions are regular almost everywhere except a bolt structure on a single point in any dimensionality. We also show that in the context of considered ansatzes for the metric function
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Twisted self-duality Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-17 David S. Berman, Tancredi Schettini Gherardini
We examine a generalization of the usual self-duality equations for Yang–Mills theory when the color space admits a nontrivial involution. This involution allows us to construct a nontrivial twist which may be combined with the Hodge star to form a twisted self-dual curvature. We will construct a simple example of twisted self-duality for su(2)⊕su(2) gauge theory along with its explicit solutions,
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Comparison between some machine learning algorithms on predicting the spectra of quark–anti-quark bound states Int. J. Mod. Phys. A (IF 1.6) Pub Date : 2023-08-18 T. A. Nahool, Atef Ismail, Samah K. Elshamndy, A. M. Yasser
This study is devoted to investigate the implementation of machine learning methodologies in the prediction of Quark–anti-Quark bound state spectrum. Predictions are produced by using variety of machine learning (ML) approaches, such as ridge regression, random forest regression, linear regression and K-nearest neighbors regression methods. The forecasts are then evaluated and contrasted in order to