物理最新文献

{"title":"Multi-components fluid in f(R, T) gravity with observational constraints","authors":"Bhupendra Kumar Shukla,&nbsp;Shambel Sahlu,&nbsp;Değer Sofuoğlu,&nbsp;Preeti Mishra,&nbsp;Alnadhief H. A. Alfedeel","doi":"10.1140/epjp/s13360-025-06200-8","DOIUrl":"10.1140/epjp/s13360-025-06200-8","url":null,"abstract":"<div><p>In this paper, the accelerating expansion of the universe has been investigated in the multi-components fluid in the coupling of geometry with matter alternative theory <i>f</i>(<i>R</i>, <i>T</i>) gravity, where the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar <i>R</i> and of the trace of the stress-energy tensor <i>T</i>. To address the late-time accelerating universe, we solve the Friedmann equations via the nonzero divergence of the energy-momentum tensor considered in the presence of a multi-component fluid. The best-fit values of the model parameters are determined using the Markov Chain Monte Carlo (MCMC) simulation using the cosmic chronometers (CC) dataset, which consists of 31 points and the recent Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNIa) ranging in redshift from <span>(z = 0.001)</span> to 2.26. The trajectory of the deceleration parameter indicates that the universe has transitioned from a deceleration phase to an acceleration phase. We also look into the behavior of the jerk and snap parameters, the statefinder analysis, the om diagnostic, and the effective EoS parameter. It is shown that the model considered is consistent with the accelerating universe and the predictions of the quintessence model at present.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06200-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716886","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":"Stability, photovoltaic, and optoelectronic properties of eco-friendly (CsGeCl_{3-n}F_n) halide perovskite for solar cells applications: insights from DFT calculations","authors":"J. Islah,&nbsp;E. Darkaoui,&nbsp;A. Abbassi,&nbsp;S. Taj,&nbsp;B. Manaut,&nbsp;H. Ez-Zahraouy","doi":"10.1140/epjb/s10051-025-00895-5","DOIUrl":"10.1140/epjb/s10051-025-00895-5","url":null,"abstract":"<p>This study explores the characteristics of fluorine-substituted lead-free halide perovskites <span>(CsGeCl_{3-n}F_n)</span> for clean energy applications, focusing on their structural, stability, and optoelectronic characteristics. Density functional theory (DFT) calculations, using Quantum Espresso code (QE), were performed to assess the material performance of the <span>(CsGeCl_{3-n}F_n)</span> series (<span>(n=0,1,2,3)</span>). The results reveal that fluorine substitution significantly enhances both thermodynamically and mechanical stability, which are confirmed by calculated formation energy and elastic constants. The Pugh’s and Poisson ratios are estimated to confirm reduced brittleness and increased ductility in <span>(CsGeCl_3)</span> upon the increase of fluorine content. The electronic analysis reveals a direct semiconducting nature with a tunable band gap, increasing from 1.03 eV to 2.06 eV upon fluorine substitution. Optical analysis indicates anisotropic behavior in mixed halides perovskites, <span>(CsGeCl_2F)</span> and <span>(CsGeClF_2)</span>, exhibiting strong absorption coefficients on the order of <span>(10^5)</span> cm<span>(^{-1})</span>, low reflectivity, and weak electron–hole interactions. These findings underscore the potential of <span>(CsGeCl_{3-n}F_n)</span> perovskites for improved performance in solar cells and other optoelectronic devices. The results offer valuable insights into optimizing these materials for advanced optoelectronic applications and sustainable energy technologies.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716885","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":"The spectroscopy of Kerr–Einstein–Maxwell-dilaton-axion: exact quasibound states, scalar cloud, horizon’s Boson statistics and superradiant","authors":"David Senjaya,&nbsp;Supakchai Ponglertsakul","doi":"10.1140/epjc/s10052-025-14014-2","DOIUrl":"10.1140/epjc/s10052-025-14014-2","url":null,"abstract":"<div><p>In the present study, we investigate the quasibound states, scalar cloud and superradiant of relativistic scalar fields bound to a rotating black hole in Kerr–Einstein–Maxwell-dilaton-axion theory (Kerr-EMDA). We present the exact eigensolutions of the governing Klein–Gordon equation in the black hole background. By imposing boundary conditions on the quasibound states, we are able to find the exact complex quasibound state frequencies of the corresponding radial wave functions in terms of the confluent Heun polynomial. Considering the light scalar field limit of the obtained solution, we investigate the scalar–black hole resonance configuration known as the scalar cloud. In addition, we obtain an analytical relationship between the light scalar mass and black hole spin for the scalar cloud. We explore a boson distribution function by linearly expanding the radial wave function near the black hole’s event horizon. Moreover, by applying the Damour–Ruffini method, we are able to calculate the Hawking radiation flux. In the final section, we consider a propagating wave in a slowly rotating Kerr-EMDA black hole for bosons with a much larger Compton wavelength than the size of the rotating black hole. This condition allows us to use asymptotic matching to calculate the amplification factor for scalar fields in the Kerr-EMDA black hole. We present the dependence of the amplification factor on the black hole parameters by graphical analysis.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14014-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716815","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":"Highly tunable propagating surface plasmons on supported ITO nanowire metamaterial","authors":"Tatjana Gric","doi":"10.1007/s00340-025-08461-8","DOIUrl":"10.1007/s00340-025-08461-8","url":null,"abstract":"<div><p>Few things are known about metal-less nanowires, however it is commonly known that surface plasmons—the quanta of the collective oscillations of free electrons at a metal surface—can be easily tuned for metal nanoparticles and metal surfaces. Here, we discover that surface plasmons on nanowires composed of alternative plasmonic materials, like ITO, have a highly tunable nature, which can be adjusted by adjusting the carrier concentration and, consequently, the properties of ITO. Calculated dispersion relations, propagation lengths of plasmon modes in the system are presented. This allows us to characterize and categorize the modes into two groups: Ferrel-Berreman modes and surface plasmon polaritons. Such high sensitivity is necessary to directly regulate the optical signal dispersion for various routing and demultiplexing operations in plasmonic circuits and could pave the way for the development of on-chip ultrasensitive biosensing.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716822","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":"Physics of the transition to detonation of gaseous flames","authors":"Paul Clavin","doi":"10.1140/epjp/s13360-025-06192-5","DOIUrl":"10.1140/epjp/s13360-025-06192-5","url":null,"abstract":"<div><p>The deflagration-to-detonation transition of a self-accelerating flame brush in a closed channel is produced by the local explosion of a tiny kernel of unburned gas on a laminar element of the flame front. This unexplained explosion was analyzed recently by a series of asymptotic analyses. Originally identified on the tip of a laminar elongated flame in tubes of small radius, the explosion mechanism is extended here to self-turbulent flames, to hot spots in the boundary layers and also on cellular flames expanding in free space. The mechanism is presented here to physics-oriented readers, skipping technical details of the theoretical developments. The runaway of the local temperature and pressure is due to the coupling of the inner flame structure with the acceleration-induced downstream-running pressure waves in the external flows. This leads to a dynamical saddle-node bifurcation whose critical condition is in good agreement with experiments.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726628","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":"Gluon Wigner distributions in a light-cone spectator model","authors":"Chentao Tan,&nbsp;Zhun Lu","doi":"10.1140/epjc/s10052-025-14054-8","DOIUrl":"10.1140/epjc/s10052-025-14054-8","url":null,"abstract":"<div><p>We study the gluon Wigner distributions of the proton which are the phase-space distributions containing the most general one-parton information. Using the proton wave functions deduced from a light-cone spectator model that contains the gluonic degree of freedom, we calculate the Wigner distributions of the unpolarized and longitudinally polarized gluon inside the unpolarized/longitudinally polarized proton via the Fock-state overlap representation, respectively. We present the numerical results of the transverse Wigner distributions in which the longitudinal momentum fraction is integrated out. We also provide the gluon orbital angular momentum and spin-orbit correlations deduced from the gluon Wigner distribution.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14054-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726740","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":"The Fierz–Pauli theory on curved spacetime at one-loop and its counterterms","authors":"Leonardo Farolfi,&nbsp;Filippo Fecit","doi":"10.1140/epjc/s10052-025-14083-3","DOIUrl":"10.1140/epjc/s10052-025-14083-3","url":null,"abstract":"<div><p>We compute the first four heat-kernel coefficients required for the renormalization of Linearized Massive Gravity. We focus on the Fierz–Pauli theory in a curved spacetime, describing the propagation of a massive spin 2 field in a non-flat background. The background must be on-shell, i.e. must be an Einstein space, in order to ensure a consistent extension of the Fierz–Pauli theory beyond Minkowski space. Starting from the Stückelberg formulation with restored gauge invariance, we apply suitable gauge-fixing procedures to simplify the complicated non-minimal kinetic operators of the scalar, vector, and tensor sectors of the theory, reducing them into manageable minimal forms. Using standard techniques, we then compute the Seeley–DeWitt coefficients, with particular emphasis on the fourth coefficient, <span>(a_3(D))</span>, in arbitrary spacetime dimensions. This result constitutes our main contribution, as it has not been previously reported in full generality in the literature.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14083-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726741","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":"Investigating the role of new physics in semileptonic (varUpsilon (nS) rightarrow B_c l^-{bar{nu }}_{l} ) weak decays","authors":"Jin-Huan Sheng,&nbsp;Feng-Zi Zhou,&nbsp;Yuan-Yuan Li,&nbsp;Yuan-Guo Xu","doi":"10.1140/epjc/s10052-025-14044-w","DOIUrl":"10.1140/epjc/s10052-025-14044-w","url":null,"abstract":"<div><p>Recently, the excess in the measurement of the branching fractions of <span>({bar{B}} rightarrow D^{(*)} tau ^- {bar{nu }}_{tau })</span> and <span>(B_c rightarrow J/varPsi tau ^-{bar{nu }}_{tau })</span> compared to the standard model expectation hints the existence of new physics beyond the standard model. Motivated by these inspiring anomalies, which may imply hints of new physics, as well as abundant <span>(varUpsilon (nS))</span> data samples, in this work, we perform the analysis of the semileptonic decays <span>(varUpsilon (nS) rightarrow B_c l^- bar{nu _{l}}(n=1,2,3))</span>, which is also induced by <span>( b rightarrow c l^- bar{nu _{l}})</span> transitions at the quark level, both within the standard model and beyond. Starting with the most general effective Hamiltonian relevant for the <span>(b rightarrow c l^-bar{nu _{l}})</span> transition, we report the prediction of standard model for various observables, such as branching ratios, the ratio of branching fractions, the lepton side forward-backward asymmetries, the initial hadron and final lepton longitudinal polarization asymmetries and the convexity parameter, as well as for some new observable that is similar to lepton non-universality, <span>(R_{B_c}(q^2))</span>, which is related to the processes <span>(varUpsilon (nS) rightarrow B_c l^- bar{nu _{l}}(n=1,2,3))</span>. These predictions are made using transition form factors which are calculated in the Bauer Stech Wirbel framework. Using previously obtained significant fits of the new physics couplings, predictions for the <span>(q^2)</span> dependence of different observable within various new physics scenarios are also presented. Some observable of the decay modes are sizeable and deviate significantly from their corresponding prediction of the standard model, especially in new physics scenarios with <span>(S_R)</span> coupling parameter. We hope that the corresponding investigation in this work will be testified by future experiments. Additionally, the study of the meson decays will also enhance the study of b hadron decay processes, as they provide good complementary environment for searching new physics signal. \u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14044-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706980","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":"Innovative high sensitivity, selectivity, and low birefringence limit based blood cell detection in terahertz spectrum with octagonal core refractive index sensing","authors":"A. H. M. Iftekharul Ferdous,&nbsp;Kayab Khandakar,&nbsp;Sakhawat Hossain,&nbsp;Khalid Sifulla Noor,&nbsp;Mahmoud M. A. Eid,&nbsp;Ahmed Nabih Zaki Rashed","doi":"10.1007/s00339-025-08450-w","DOIUrl":"10.1007/s00339-025-08450-w","url":null,"abstract":"<div><p>Biosensors are crucial for identifying different blood components. In this work, we introduce an octagonal core photonic crystal fiber (PCF) structured like a spider for very effective blood cell identification. The Finite Element Method (FEM) in COMSOL Multiphysics is used to investigate the optical and sensing properties of the sensor. Maxwell’s equations are quantitatively solved over the 0.5–1.3 THz frequency range. Achieving high relative sensitivity (RS), low effective material loss (EML), low confinement loss (CL), a large effective area (EA) and spot size for various blood components is the main emphasis of the investigation. Zeonex polymer, well-known for its outstanding THz domain optical characteristics, is used in cladding fabrication of the PCF At 1 THz, the proposed PCF sensor exhibits outstanding performance with a relative sensitivity of around 92.06% for glucose, 92.78% for plasma, 93.45% for white blood cells (WBCs), and 95.64% for red blood cells (RBCs). Since the octagonal core structure produces almost the same results for both x- and y-polarization modes, the research mainly investigates the x-polarization mode.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-025-08450-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AdS Ellis wormholes with scalar field","authors":"Chen-Hao Hao,&nbsp;Xin Su,&nbsp;Yong-Qiang Wang","doi":"10.1140/epjc/s10052-025-13937-0","DOIUrl":"10.1140/epjc/s10052-025-13937-0","url":null,"abstract":"<div><p>In this paper, we study the spherically symmetric traversable wormholes supported by a phantom field in the anti-de Sitter (AdS) asymptotic spacetime. We couple an additional complex scalar field into this wormhole spacetime and study the physical properties of this model. Despite coupling the scalar matter field, these wormholes remain massless and symmetric for reflection of the radial coordinate <span>(r rightarrow -r.)</span> The solution possesses a finite Noether charge <i>Q</i>,  which varies as a function of frequency <span>(omega )</span> with changes in the cosmological constant <span>(Lambda )</span> and the throat size <span>(r_0.)</span> Under specific conditions, an approximate “event horizon” will appear at the throat.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13937-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706978","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}