物理最新文献

{"title":"Physical properties of black hole solutions in Einstein–Bel–Robinson gravity","authors":"Seyed Naseh Sajadi,&nbsp;Supakchai Ponglertsakul,&nbsp;Dhruba Jyoti Gogoi","doi":"10.1140/epjc/s10052-025-14555-6","DOIUrl":"10.1140/epjc/s10052-025-14555-6","url":null,"abstract":"<div><p>In this paper, we study the different \u0000properties of static spherically symmetric black hole solutions of Einstein–Bel–Robinson gravity (EBR), a modified four-dimensional theory of gravity quartic in curvature. We look at the implications of EBR gravity on the orbit of massless and massive test bodies, derive modified expressions, and show how the higher curvature term influences the behavior of particle trajectories near black holes. Specifically, computing the innermost stable circular orbit and photon sphere, and finding them smaller than their Einstein counterparts in general relativity. Next, we obtain the deflection angle and shadow of an EBR black hole and find that both decrease compared to a non-rotating black hole in general relativity. Using the Shapiro time delay, we obtain a bound value for the coupling constant. Then, we explore the EBR black hole’s lifetime and find that it decreases to Einstein’s gravity. Quasinormal modes (QNMs) are computed using Padé averaged sixth-order WKB method, showing that increasing the coupling constant lowers the damping rate of ring-down gravitational waves (GWs). The oscillation frequency of scalar QNMs decreases with the coupling constant, whereas it increases for electromagnetic QNMs. We also provide an analytically rigorous bound on the greybody factor. We show that the coupling constant has a small effect on the greybody factor. Finally, correspondence between the greybody factor and quasinormal modes is also considered.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 9","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14555-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990523","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":"Cross-section of the ({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xtextrm{n})^{58}textrm{Co}) reaction at the bremsstrahlung end-point energy of 35–94 MeV","authors":"I. S. Timchenko,&nbsp;O. S. Deiev,&nbsp;S. M. Olejnik,&nbsp;S. M. Potin,&nbsp;V. A. Kushnir,&nbsp;V. V. Mytrochenko,&nbsp;S. A. Perezhogin,&nbsp;A. Herzáň","doi":"10.1140/epja/s10050-025-01666-7","DOIUrl":"10.1140/epja/s10050-025-01666-7","url":null,"abstract":"<div><p>The photoproduction of the <span>(^{58}textrm{Co})</span> nuclei on <span>({^textrm{nat}textrm{Ni}})</span> was studied using the induced <span>(gamma )</span>-activity method and offline <span>(gamma )</span>-ray spectrometric technique. The experiment was performed at the electron linear accelerator LUE-40 of NSC KIPT, Ukraine. The total flux-averaged cross-section <span>(langle {sigma (E_{gamma textrm{max}})}rangle )</span> for the <span>({^textrm{nat}textrm{Ni}}(gamma ,textrm{p} xmathrm n)^{58}textrm{Co})</span> reaction has been measured in the range of bremsstrahlung end-point energies <span>(E_{gamma textrm{max}})</span> = 35–94 MeV. The obtained <span>(langle {sigma (E_{gamma textrm{max}})}rangle )</span> were compared with theoretical estimates, and with experimental data found in the literature. The theoretical values of <span>(langle {sigma (E_{gamma textrm{max}})}rangle _textrm{th})</span> were calculated using the partial cross-sections <span>(sigma (E))</span> from the TALYS1.96 code for different level density models and gamma strength functions.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01666-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990537","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":"Mono-laser scanning measurement of radial operating deflection shapes for cylindrical shells: validation by 3D Digital Image Correlation","authors":"Xiaofan Wu,&nbsp;Feipeng Zhu,&nbsp;Yuchen Yang,&nbsp;Wei Xu","doi":"10.1007/s00340-025-08538-4","DOIUrl":"10.1007/s00340-025-08538-4","url":null,"abstract":"<div><p>Cylindrical shells, such as gas pipes and wind turbine towers, are common structural components. Ensuring the stability of these structures necessitates accurate measurement of their three-dimensional (3D) operating deflection shapes (ODSs). Laser Doppler Vibrometry (LDV) and Digital Image Correlation (DIC) are two prevalent optical measurement techniques. Measuring radial vibrations of a cylindrical shell only using a 1D scanning laser Doppler vibrometer (1D-SLDV) poses a challenging yet practical problem, as the cost of a 1D-SLDV is significantly lower than that of a 3D-SLDV. Addressing this issue, the authors previously proposed a scheme for measuring radial ODSs of a cylinder via mono-laser scanning. By leveraging the geometric relationship, the displacements measured by the laser at each point are transformed to obtain radial displacements. Although it was proven through numerical simulation using the finite element (FE) method, experimental validation via 3D measurements is critical and still pending. To ensure the reliability of this scheme, it is experimentally validated in this study through comparison with the actual radial ODSs captured by 3D DIC. To validate the accuracy of the corrected radial ODSs, the cosine similarity (CS) values across the radial ODSs obtained through the FE method, LDV, and DIC are calculated, demonstrating a high degree of similarity. Particularly, the LDV and DIC yield consistent radial ODSs, with their CSs exceeding 95% for each excitation frequency.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 10","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-025-08538-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990617","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":"Is the composition of the solar atmosphere unusual, and if so, why?","authors":"Bengt Gustafsson","doi":"10.1007/s00159-025-00160-9","DOIUrl":"10.1007/s00159-025-00160-9","url":null,"abstract":"<div><p>The ongoing discussion about the atomic chemical composition of the Sun is commented on. The main focus in this review is on the deviation of the solar composition from that of most other solar-type stars in that its ratio of volatiles (like the elements C, N, O, S, P and Zn) to the refractories (most metals, like Ba, Ca, Ti, Y, Al, Sc and Zr) tends to be higher in the Sun by 10 to 20%. What does this tell about the formation and evolution of the Solar System? Scenarios in terms of galactic evolution, formation of the pre-solar nebula, of the evolution of the protoplanetary disk, of the engulfing of planets, and of other processes within the Solar System are considered, as well as the evolution of binary stars with similarly different chemical composition. Finally, implications, if any, on the habitability of the Solar System will be commented on.</p></div>","PeriodicalId":785,"journal":{"name":"The Astronomy and Astrophysics Review","volume":"33 1","pages":""},"PeriodicalIF":26.5,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00159-025-00160-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Linear stability of charged warm holes","authors":"Radouane Gannouji,&nbsp;Alejandro Guzmán Antonucci","doi":"10.1140/epjc/s10052-025-14661-5","DOIUrl":"10.1140/epjc/s10052-025-14661-5","url":null,"abstract":"<div><p>Charged black holes are known to suffer from an interior instability associated with the presence of the Cauchy horizon. Recently, a hairy charged black hole was proposed that avoids the formation of a Cauchy horizon. It is natural to question whether this instability might manifest in the exterior solution. In this paper, we have analyzed the stability of this black hole. Our results show that vector perturbations are stable, along with the scalar sector for <span>(l=0)</span>. We have also computed the corresponding quasinormal modes (QNMs) and quasibound states (QBSs).\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 9","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14661-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934614","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":"A Study of a Riemann Soliton in a Perfect Fluid Space-Time and (boldsymbol{f(r,T)})-Gravity","authors":"Sampa Pahan,&nbsp;Souvik Dutta","doi":"10.1134/S0202289325700240","DOIUrl":"10.1134/S0202289325700240","url":null,"abstract":"<p>We carry out geometric attribution of perfect fluid space-time in terms of a Riemann soliton with a torse forming vector field. It is shown that a perfect fluid space-time becomes a dark fluid space-time when we represent the timelike velocity vector field to be a torse-forming vector field. Next, we have investigated the nature of a Riemann soliton in perfect fluid space-time under certain curvature conditions in terms of the cosmological constant, the gravitational constant, energy density and isotropic pressure. We have also constructed an example of Riemann soliton in perfect fluid space-time. Finally, we have classified the Riemann soliton in a perfect fluid space-time obeying <span>(f(r,T))</span>-gravity in terms of energy density and isotropic pressure.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 3","pages":"366 - 374"},"PeriodicalIF":1.0,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934755","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":"Generalized Robertson–Walker Space-Times Admitting (boldsymbol{eta})-Ricci–Yamabe Solitons","authors":"Ansari Rakesh Baidya,&nbsp;Uday Chand De,&nbsp;Abul Kalam Mondal","doi":"10.1134/S0202289325700288","DOIUrl":"10.1134/S0202289325700288","url":null,"abstract":"<p>We study <span>(eta)</span>-Ricci–Yamabe solitons and gradient <span>(eta)</span>-Ricci–Yamabe solitons in generalized Robertson–Walker space-times . At first, we provide an example of an <span>(eta)</span>-Ricci–Yamabe soliton. Next, we prove that if a generalized Robertson–Walker space-time admits an <span>(eta)</span>-Ricci–Yamabe soliton or a gradient <span>(eta)</span>-Ricci–Yamabe soliton, then it becomes a perfect fluid space-time. As a consequence, we obtain several interesting corollaries.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 3","pages":"408 - 414"},"PeriodicalIF":1.0,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934759","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":"Gravitational Field of a Self-gravitating Continuous Medium, Dark Matter and Disk Galaxies","authors":"V. M. Zhuravlev","doi":"10.1134/S0202289325700173","DOIUrl":"10.1134/S0202289325700173","url":null,"abstract":"<p>A new representation for the field strength of the quasiclassical gravitational field of a continuous medium is proposed, which makes it possible to describe the effect of hidden mass or dark matter in a new way. The connection of the new representation with the properties of a continuous medium and the role of these properties in the formation of the hidden mass effect are discussed. Based on the results obtained, a new model of the structure of disk galaxies and their own evolution under dynamic equilibrium conditions is being investigated. A general classification of possible types of spatial structures of disk galaxies is given. The existence conditions of disk galaxies with bulges and jets, as well as ring structures, are considered. A qualitative analysis of possible variants of the galaxies’ own evolution and the conditions of their spatial oscillations is carried out.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 3","pages":"291 - 311"},"PeriodicalIF":1.0,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934793","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":"Proportional modulation of proliferation and motility under 2D compressive stress depends on mesenchymal phenotype","authors":"Zacchari Ben Meriem,&nbsp;Moetassem Billah Meksassi,&nbsp;Céline Denais,&nbsp;Julie Guillermet-Guibert,&nbsp;Morgan Delarue","doi":"10.1140/epje/s10189-025-00516-0","DOIUrl":"10.1140/epje/s10189-025-00516-0","url":null,"abstract":"<p>Tumor development is accompanied by strong physico-chemical modifications. Among them, compressive stress can emerge in both the epithelial and stromal compartments. Using a simple two-dimensional compression assay which consisted in placing an agarose weight on top of adherent cells, we studied the impact of compressive stress on cell proliferation and motility in different pancreatic cancer cell lines. We observed a proportional reduction of both proliferation and motility in all tested cell types, with genotypes displaying a more “mesenchymal” phenotype (high velocity-to-proliferation ratio) and others related to a more “epithelial” phenotype (low velocity-to-proliferation ratio). Moreover, “mesenchymal” cells seemed more sensitive to compression, a result that was further suggested by a TGF<span>(mathrm {beta })</span>1 induction of epithelial-to-mesenchymal transition. Finally, we measured that the change in cell proliferation was associated with a change in intracellular macromolecular crowding, which could modulate a plethora of biochemical reactions. Our results together suggest a mechanism in which all biochemical reactions related to proliferation and motility can be modulated by a change in macromolecular crowding, itself depending on the phenotype, leading to differential sensitivity to pressure.</p><p>Stability map on the plane Rayleigh number–solutal Rayleigh Number</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"48 8-9","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929242","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":"Gradient-induced nonlinear beam transport and soliton asymmetry in PT-symmetric hyperbolic double-well optical potential","authors":"Jaseera Chilappurath,&nbsp;Aysha Muhsina Kottummal","doi":"10.1140/epjp/s13360-025-06801-3","DOIUrl":"10.1140/epjp/s13360-025-06801-3","url":null,"abstract":"<div><p>We explore the propagation characteristics of spatial optical solitons governed by modified nonlinear Schrodinger equation (MNLS) incorporating a gradient-induced nonlinear term and a tailored parity-time (<i>PT</i>)-symmetric complex potential. The asymmetric nonlinear term induces directional energy flow, often resulting in beam shift and profile distortion. To counteract these effects, we implement a symmetric double-well potential characterized by real and imaginary components. While a strong imaginary potential is effective in suppressing asymmetric drift, stability is optimally achieved through a careful balance between nonlinearity, gain/loss, and structural parameters. Through systematic simulations, we demonstrate that increasing the cubic nonlinearity coefficient and the real potential depth enhances energy localization contributing significantly to amplitude preservation. The separation parameter and width parameter of the potential play crucial roles in controlling beam symmetry and confinement. Linear stability analysis has been performed using the Bogoliubov–de Gennes (BdG) matrix method to delineate the parameter regimes required for amplitude and position stabilization. The results reinforce the critical role of the <i>PT</i>-symmetric potential in maintaining soliton robustness under perturbations. The incorporation of complex <i>PT-</i>symmetric potentials offers a powerful method to regulate beam dynamics in integrated optical circuits, waveguide arrays, and photonic lattices where gain and loss profiles can be engineered with high precision.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929319","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}