物理最新文献

{"title":"Very special relativity: Cherenkov effect and an analogy with Minkowski’s electrodynamics of continuous media","authors":"I. H. Brevik,&nbsp;M. M. Chaichian,&nbsp;B. A. Couto e Silva,&nbsp;B. L. Sánchez-Vega","doi":"10.1140/epjc/s10052-025-14140-x","DOIUrl":"10.1140/epjc/s10052-025-14140-x","url":null,"abstract":"<div><p>In this work, we explore the implications of the Cohen and Glashow Very Special Relativity (VSR) theory, a framework that introduces Lorentz invariance violation through the presence of a preferred direction. Our analysis focuses on the impact of VSR on the Cherenkov angle, revealing modifications to the dispersion relation of particles, particularly the photon and the electron, which acquire an effective inertial mass. This modification also implies a deviation in the speed of light, which can be constrained through precise experimental measurements. Using data from the RICH system of the LHCb experiment, we take advantage of its capability to reconstruct Cherenkov angles within the momentum range of the particles of 2.6–100 GeV/c. These measurements, combined with the most stringent laboratory tests of the isotropy of the speed of light (<span>(Delta c / c sim 10^{-17})</span>), allow us to impose new upper bounds on the parameter <span>(Omega )</span>, which quantifies a deviation from the standard Special Relativity. Furthermore, we establish an analogy between VSR and Minkowski’s electrodynamics in a dielectric medium for particles with very high velocity, offering a physically intuitive interpretation of the parameter <span>(Omega )</span>.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14140-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hypersensitive SERS sensor of various types of herbicide enabled by tri elements surface alloying nanoparticles","authors":"Rasha B. Rashid,&nbsp;Alwan M. Alwan,&nbsp;Mehdi Q. Zayer","doi":"10.1007/s00339-025-08508-9","DOIUrl":"10.1007/s00339-025-08508-9","url":null,"abstract":"<div><p>Herein, a specific type of tri_elements SERS chemical sensor was created by the ion reduction process of the as-prepared porous silicon (PSi) substrate in a mixed solution of volumetric ratio (1:1:1) of metal solutions of gold, silver, and palladium of concentrations of 1 mM. The synthesized tri_elements SERS chemical sensor effectively detected two types of herbicide, atrazine and diuron, at ultra-low concentrations, less than the maximum amount permitted globally. The as-prepared porous Si was created via laser-stimulate etching (LSE) process by (60 mW/cm²) laser power density, (5 mA/cm²) current density, and (12 min) etching time. The created tri_elements SERS chemical sensor was inspected at various herbicide concentrations from 5 × 10^–5 to 5 × 10^–8 M. The results of the fabricated tri_elements sensor with a cauliflower-shaped surface alloy configuration showed an excellent Raman enhancement factor of about 4.2 × 10⁶ and 4 × 10⁶ with the lowest detection limit of about 3 × 10^–11 M and (2 × 10^–11 M) and an excellent reproducibility of minimum variation of about 2.9% and 3.1% for diuron and atrazine respectively. The density of hot spot sites and the aggregated tri-metallic nanoparticles’ size and shape are the leading causes of the sensors’ hypersensitivity.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 5","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hawking–Rényi black hole thermodynamics, Kiselev solution, and cosmic censorship","authors":"Viktor G. Czinner,&nbsp;Hideo Iguchi","doi":"10.1140/epjc/s10052-025-14117-w","DOIUrl":"10.1140/epjc/s10052-025-14117-w","url":null,"abstract":"<div><p>Explicit example, where the Hawking temperature of a black hole horizon is compatible with the black hole’s Rényi entropy thermodynamic description, is constructed. It is shown that for every static, spherically symmetric, vacuum black hole space-time, a corresponding black hole solution can be derived, where the Hawking temperature is identical with the Rényi temperature, i.e. the one obtained from the Rényi entropy of the black hole via the <i>1st law</i> of thermodynamics. In order to have this Hawking–Rényi type thermodynamic property, the black holes must be surrounded by an anisotropic fluid in the form of a Kiselev metric, where the properties of the fluid are uniquely determined by the mass of the black hole, <i>M</i>, and the Rényi parameter, <span>(lambda )</span>. In the simplest Schwarzschild scenario, the system is found to be thermodynamically unstable, and the <i>3rd law</i> of thermodynamics seems to play the role of a cosmic censor via placing an upper bound on the black hole’s mass, by which preventing the black hole from loosing its horizon(s).\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14117-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tunable induced transparency in a photonically and phononically coupled hybrid magnon-optomechanical system","authors":"Qing-Hong Liao,&nbsp;Yi-ping Cheng,&nbsp;Shao-cong Deng,&nbsp;Song-yun Ouyang","doi":"10.1140/epjp/s13360-025-06269-1","DOIUrl":"10.1140/epjp/s13360-025-06269-1","url":null,"abstract":"<div><p>We theoretically investigate the induced transparency phenomenon in a hybrid double-cavities magnon-optomechanical system. A ferromagnetic material yttrium iron garnet (YIG) sphere and a mechanical resonator are placed in one of the microwave cavities, and the other is coupled to a mechanical phonon. We observe not only magnetically induced transparency (MIT) generated by magnon–photon interaction, but also magnomechanically induced transparency (MMIT) produced by nonlinear phonon–magnon interaction. It is shown that better transparency effect is obtained by appropriately adjusting the tunneling coupling strength. The effect of the interaction of the two mechanical resonators with the two microwave cavities on the output spectrum is discussed separately. In addition, we have established a new scheme to measure the mechanical phonon–photon coupling strength. We also investigated the effect of the cavity decay rate on the output field and found that better transparency can be obtained by appropriately reducing the decay rate of the cavity. We further explored the fast and slow light conversion phenomenon. These results have potential applications in quantum information processing and high precision measurements.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stochastic Milstein computing driven autoregressive exogenous neuro-architecture for chaotic nonlinear measles transmission system with impact of immunization","authors":"Nabeela Anwar,&nbsp;Ayesha Fatima,&nbsp;Muhammad Asif Zahoor Raja,&nbsp;Iftikhar Ahmad,&nbsp;Muhammad Shoaib,&nbsp;Adiqa Kausar Kiani","doi":"10.1140/epjp/s13360-025-06247-7","DOIUrl":"10.1140/epjp/s13360-025-06247-7","url":null,"abstract":"<div><p>Measles continues to be a significant contributor to child mortality worldwide, causing thousands of deaths each year, even though a safe and effective vaccine is available. In recent years, global measles cases have risen significantly, with the majority of infections occurring in children under 5 years old and immunocompromised adults. The presented study introduces a novel autoregressive exogenous neuro-computing framework, enhanced through optimization by the Levenberg–Marquardt scheme, to model the dynamics of nonlinear stochastic measles transmission epidemic systems, considering the effects of immunization. The mathematical representations are formulated using multi-class stochastic differential compartments, describing the susceptible, immunized, exposed, infected, recovered individuals, and hospitalized cases. Synthetic data for executing the multi-layer structure of the autoregressive exogenous neuro-computing framework model are created using the Milstein method across various scenarios of the stochastic measles model, involving variation in key parameters such as rates of susceptible individuals, contact among susceptible people, immunization, mortality, infection, medical treatment, recovery, and natural death. The generated data are randomly partitioned into response and prediction sets for use in the testing, validation, and training phases of the autoregressive exogenous neuro-computing networks. The results from the designed approach exhibit a close correlation with the reference solutions, with negligible error magnitudes across all scenarios of the stochastic measles transmission model. The proposed approach is validated through convergence analyses using mean squared error, visual representations of adaptive governing parameters, error histograms, and regression indices for various nonlinear stochastic measles transmission models within mathematical biology.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A dynamic mean-field study of spin-resolved static density response of warm-dense homogeneous electron gas","authors":"Priya Arora,&nbsp;R. K. Moudgil","doi":"10.1140/epjb/s10051-025-00916-3","DOIUrl":"10.1140/epjb/s10051-025-00916-3","url":null,"abstract":"<p>Motivated by recent ab initio path-integral Monte Carlo (PIMC) simulations by Dornheim et al. (Phys Rev Res 4:033018, 2022), we have studied the role of dynamic electron correlations in determining the spin-resolved static density response of warm-dense homogeneous electron gas having arbitrary spin-polarization <span>(zeta )</span>. To this endeavor, we have used the quantum or dynamical version of the self-consistent mean-field approximation of Singwi, Tosi, Land, and Sjölander (STLS), the so-called qSTLS approach. Particularly, we have calculated the spin-resolved components of static density response function, static structure factor, and local-field correction at selected <span>(zeta )</span> and a wide range of electron density/coupling <span>(r_s)</span> and degeneracy temperature <span>(theta )</span>. We compare our results directly with PIMC simulations and lower order theories such as (static) STLS and random phase approximation (RPA). The comparative analysis reveals that in metallic density regime (<span>(r_ssim 2)</span>), the dynamics of correlations is imperceptible in static density response and static structure factor, with both qSTLS and STLS exhibiting excellent agreement with PIMC. However, its influence grows continuously with increasing effective electron coupling (<span>(r_s/theta )</span>), manifesting as a better alignment of qSTLS predictions with PIMC data as compared to STLS. Interestingly, it accounts for, above a sufficiently large <span>(r_s)</span>, the emergence of a small negative portion (though qualitatively) in the PIMC spin-offdiagonal static density response function for wave vectors characteristic of average inter-electron spacing. An assessment of spin-resolved correlations brings out that <span>(uparrow uparrow )</span> correlations are underestimated, while their <span>(uparrow downarrow )</span> counterpart are overestimated, with a fortunate cancellation (closely at small coupling <span>(r_s)</span>) between their effects in the spin-summed static response and structure factor. Nevertheless, the spin components of self-consistent static local-field correction factor match with PIMC estimate mainly at small wave vectors, with even a qualitative mismatch between the two at <span>(r_s=2)</span> and <span>(theta =1)</span> for the <span>(uparrow uparrow )</span> component at large wave vectors, where the former saturates to a positive value as against a negative tail in the latter.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"μTRISTAN- and LHC-/Tevatron-/FCC-/SppC-based antimuon–hadron colliders","authors":"Dilara Akturk,&nbsp;Burak Dagli,&nbsp;Bora Ketenoglu,&nbsp;Arif Ozturk,&nbsp;Saleh Sultansoy","doi":"10.1140/epjp/s13360-025-06184-5","DOIUrl":"10.1140/epjp/s13360-025-06184-5","url":null,"abstract":"<div><p>Recently, the construction of <i>µ</i>⁺<i>e</i>^<i>−</i> and <i>µ</i>⁺<i>µ</i>⁺ colliders, <i>μ</i>TRISTAN, at KEK has been proposed. We argue that the construction of a similar <i>μ</i>⁺ ring tangential to LHC/Tevatron/FCC/SppC will give an opportunity to realize <i>µ</i>⁺<i>p</i> and <i>µ</i>⁺<i>A</i> collisions at multi-TeV scale center-of-mass energies. In this paper, the main parameters of proposed colliders have been studied. It is shown that sufficiently high luminosities can be achieved for all proposals under consideration: <i>L</i> exceeds 10³³ cm⁻² s⁻¹ for <i>µ</i>⁺<i>p</i> colliders and 10³⁰ cm⁻² s⁻¹ for <i>µ</i>⁺<i>A</i> colliders. Certainly, proposed colliders will provide huge potential for both SM (especially QCD basics) and BSM physics searches.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06184-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional temperature diagnostics based on thermally-assisted volumetric laser-induced fluorescence","authors":"Shengbo Tang,&nbsp;Xingyu Zhou,&nbsp;Yuan Ye,&nbsp;Wenjiang Xu","doi":"10.1007/s00340-025-08466-3","DOIUrl":"10.1007/s00340-025-08466-3","url":null,"abstract":"<div><p>This research introduces a novel application of three-dimensional (3D) combustion thermometry through the thermally-assisted volumetric laser-induced fluorescence, namely the TAVLIF technique. The TAVLIF method is designed to provide quantitative 3D temperature diagnostics using a single dye-laser system, combining the advantage of tomographic imaging with the thermally-assisted LIF approach. The technique employs the <i>A²Σ⁺</i>←<i>X²Π</i> (0, 0) band Q₁(7) transition to excite OH radicals within a controlled Bunsen burner flame. Following excitation, the fluorescence emitted from the resonant (0, 0) and non-resonant (1, 0) vibrational bands is captured sequentially by an intensified camera, facilitating the reconstruction of the 3D fluorescence field. Utilizing the axisymmetric and stable properties of the burner flame, we reconstruct the 3D distribution of fluorescence signals from both bands. The resulting 3D temperature field is determined by the ratio of fluorescence intensities between the two bands, employing a novel ternary model calibrated experimentally to relate temperature to fluorescence ratio. After accounting for acquisition errors such as reflection and scattering of excitation light, as well as reconstruction and temperature calculation errors, the relative error remains below 6%. This research demonstrates the cost-effectiveness (only one dye laser system), accuracy, and reliability of the TAVLIF technique in diagnosing 3D temperature fields within combustion processes.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First-principle event reconstruction by time-charge readouts for TAO","authors":"Xuewei Liu,&nbsp;Wei Dou,&nbsp;Benda Xu,&nbsp;Hanwen Wang,&nbsp;Guofu Cao","doi":"10.1140/epjc/s10052-025-14161-6","DOIUrl":"10.1140/epjc/s10052-025-14161-6","url":null,"abstract":"<div><p>The Taishan Antineutrino Observatory (TAO) is a liquid-scintillator satellite experiment of the Jiangmen Underground Neutrino Observatory (JUNO) to measure the reference reactor neutrino spectrum with unprecedented energy resolution. We use inhomogeneous Poisson process and Tweedie generalized linear model (GLM) to characterize the detector response and the charge distribution of a SiPM. We develop a pure probabilistic model for time and charge of SiPMs from first principles to reconstruct point-like events in the TAO central detector. Thanks to our precise model and the high photo-coverage and quantum efficiency of the SiPM tiles at TAO, we achieve vertex position resolution better than <span>(20,hbox {mm})</span>, energy resolution of about <span>(2%)</span> at <span>(1,hbox {MeV})</span> and <span>(&lt;0.5%)</span> non-uniformity, marking the world’s best performance of liquid scintillator detectors. With such resolution, we perceive <span>(hbox {MeV})</span> events to exhibit track effects. It opens up an exciting possibility of computed tracking calorimeter for unsegmented liquid scintillator detector like TAO. Our methodology is applicable to other experiments that utilize PMTs for time and charge readouts.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14161-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discovery of exact solitons to the fractional KP-MEW equation with stability analysis","authors":"Haitham Qawaqneh,&nbsp;Yasser Alrashedi,&nbsp;Hijaz Ahmad,&nbsp;Ahmet Bekir","doi":"10.1140/epjp/s13360-025-06188-1","DOIUrl":"10.1140/epjp/s13360-025-06188-1","url":null,"abstract":"<div><p>This research derives the new solitons for the fluid wave model, a nonlinear Kadomtsev–Petviashvili-modified equal width model along truncated M-fractional derivative. Our concerned model is utilized to explain the matter-wave pulses, waves in ferromagnetic media, and long wavelength water waves with frequency dispersion and faintly nonlinear reinstating forces, and others. To this end, we apply the modified extended direct algebraic and the improved <span>((G'/G))</span>-expansion techniques. Fractional transformation is utilized to convert the nonlinear fractional partial differential equation into a nonlinear ordinary differential equation. Mathematica software is used to gain the solutions, verify them, and demonstrate them in two-, three-dimensional, and contour plots. The impact of fractional derivative is represented through two-dimensional plot. A linear stability process is conducted to confirm that governing equation is stable. The techniques are reliable to use and provide the various types of solutions.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}