High Energy Density Physics最新文献

{"title":"Exploring charged compact stars in f(Q) gravity with the Finch–Skea metric","authors":"M. Sharif ,&nbsp;Eman M. Moneer ,&nbsp;Madiha Ajmal ,&nbsp;Euaggelos E. Zotos","doi":"10.1016/j.hedp.2025.101211","DOIUrl":"10.1016/j.hedp.2025.101211","url":null,"abstract":"<div><div>This manuscript explores the feasibility and stability of anisotropic compact stars within the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity framework (<span><math><mi>Q</mi></math></span> represents the non-metricity scalar) using the Finch–Skea metric. To determine the unknown constants, the star’s interior is smoothly matched with the exterior Reissner–Nordström solution at the boundary. Various physical properties, including fluid parameters, equation of state parameters and energy conditions are examined. Additionally, the mass–radius relationship, compactness and redshift of charged compact stars are investigated. Equilibrium and stability are evaluated using the Tolman–Oppenheimer–Volkoff equation, the causality condition, the Herrera cracking and the adiabatic index. Our findings demonstrate that <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow></mrow></math></span> gravity supports the existence of stable and viable compact stars, fulfilling all the required physical conditions.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101211"},"PeriodicalIF":1.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518060","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":"Scalar-tensor corrections and observational signatures of hairy black holes in Horndeski gravity","authors":"Erdem Sucu,&nbsp;İzzet Sakallı","doi":"10.1016/j.hedp.2025.101220","DOIUrl":"10.1016/j.hedp.2025.101220","url":null,"abstract":"<div><div>We investigate specific physical properties of a previously derived hairy black hole solution in a particular Horndeski gravity model, focusing on observational signatures that might distinguish it from standard General Relativity (GR) solutions. Working with the metric function <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow><mo>=</mo><mn>1</mn><mo>−</mo><mfrac><mrow><mn>2</mn><mi>m</mi></mrow><mrow><mi>r</mi></mrow></mfrac><mo>+</mo><mfrac><mrow><mi>h</mi></mrow><mrow><mi>r</mi></mrow></mfrac><mo>ln</mo><mfenced><mrow><mfrac><mrow><mi>r</mi></mrow><mrow><mn>2</mn><mi>m</mi></mrow></mfrac></mrow></mfenced></mrow></math></span> derived by Perez Bergliaffa et al., where <span><math><mi>h</mi></math></span> represents the scalar hair parameter, we analyze its horizon structure and thermodynamic behavior. We demonstrate how the parameter <span><math><mi>h</mi></math></span> modifies the Hawking temperature according to <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>H</mi></mrow></msub><mo>=</mo><mfrac><mrow><mn>2</mn><mi>m</mi><mo>+</mo><mi>h</mi></mrow><mrow><mn>16</mn><mi>π</mi><msup><mrow><mi>m</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></mfrac></mrow></math></span>, with negative values suppressing temperature below the Schwarzschild baseline while positive values enhance it, potentially leading to altered evaporation processes compared to standard black holes. Using the Hamilton–Jacobi formalism modified by generalized uncertainty principle (GUP) considerations, we explore wave propagation and particle motion in this spacetime, deriving particle-dependent temperature corrections that introduce species-specific thermodynamic behavior. We derive analytical expressions for gravitational deflection angles in three distinct contexts: light rays in vacuum, electromagnetic waves in plasma, and massive particles, applying both the Gauss–Bonnet theorem and the Jacobi metric approach. For each case, we present explicit formulas showing the characteristic logarithmic terms introduced by the scalar hair, with plasma effects amplifying these signatures through frequency-dependent modifications. Through numerical analysis illustrated in our figures, we demonstrate how the scalar hair parameter influences the magnitude of these effects, revealing that negative <span><math><mi>h</mi></math></span> values produce dramatically different phenomenology compared to positive values. Our entropy analysis reveals logarithmic corrections to the Bekenstein–Hawking area law consistent with quantum gravity predictions, supporting remnant formation scenarios that could resolve the information paradox.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101220"},"PeriodicalIF":0.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890456","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":"Anisotropic spheres via embedding approach in Ricci inverse gravity","authors":"Adnan Malik ,&nbsp;Amjad Hussain ,&nbsp;Ayesha Almas ,&nbsp;M. Farasat Shamir ,&nbsp;Fatemah Mofarreh","doi":"10.1016/j.hedp.2025.101196","DOIUrl":"10.1016/j.hedp.2025.101196","url":null,"abstract":"<div><div>We present a class of anisotropic and spherically symmetric solutions characterized by the function <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>A</mi><mo>)</mo></mrow><mo>=</mo><mi>R</mi><mo>+</mo><mi>α</mi><mi>A</mi></mrow></math></span>, where <span><math><mi>R</mi></math></span> is the Ricci scalar, <span><math><mi>A</mi></math></span> is the anticurvature scalar, and <span><math><mi>α</mi></math></span> is the coupling constant. The model is constructed by applying the Karmarkar condition to determine the radial metric coefficient and assuming a specific form for the temporal metric coefficient. Boundary conditions are derived to guarantee the continuity of spacetime, utilizing the Schwarzschild solution as the exterior spacetime. A detailed analysis of various physical properties, including energy density, pressure components, anisotropic pressure, energy conditions, the equation of state, mass function, surface redshift, compactness factor, adiabatic index, sound speed, and the Tolman–Oppenheimer–Volkoff equilibrium condition, is conducted. The complete analysis is applied to two well-known stars, Her X1 and Cen X3. The results demonstrate that all physical criteria are satisfied, confirming that the solutions are physically viable and consistent with established theoretical expectations.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101196"},"PeriodicalIF":1.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166978","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":"Interplay of Einasto density profile and complexity on wormhole dynamics in modified gravity theory","authors":"Tayyab Naseer ,&nbsp;M. Sharif ,&nbsp;Mona Faiza ,&nbsp;Wedad Albalawi ,&nbsp;Abdel-Haleem Abdel-Aty","doi":"10.1016/j.hedp.2025.101218","DOIUrl":"10.1016/j.hedp.2025.101218","url":null,"abstract":"<div><div>The goal of this study is to explore the existence of charged traversable wormholes coupled with an Einasto density profile within <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> gravity theory through the implication of its standard linear model. The Morris-Thorne line element is considered in this regard through which we develop the field equations characterizing anisotropic fluid setup. We then determine two distinct shape functions by varying the redshift parameter as constant and variable. The established functions fulfill the required conditions and connect two asymptotically flat spacetime regions. We also assess their feasibility by checking whether they violate the null energy conditions. Further, we explore the gravitational mass and complexity factor for the obtained model. It is noted that the later factor attains its lowest value at all the points near the wormhole throat. Our analysis shows that these wormhole geometries comply with the necessary conditions for existence, and hence, are valid within the framework of this modified gravity.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101218"},"PeriodicalIF":0.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890455","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":"Effect of mode number on stimulated Brillouin backscattering in inhomogeneous plasmas","authors":"M. Hashemzadeh","doi":"10.1016/j.hedp.2025.101214","DOIUrl":"10.1016/j.hedp.2025.101214","url":null,"abstract":"<div><div>Effects of mode number and intensity of the laser beam on eigenvalues and eigenfunctions of electromagnetic waves in inhomogeneous collisionless and collisional plasmas and their stability to the stimulated Brillouin backscattering are investigated. The nonlinearity in the collisionless is due to the ponderomotive force and the Ohmic heating arises in the collisional case. It is obtained the electric field equation and distribution of the modified electron density in collisionless and collisional plasmas. Eigenmodes and eigenfunctions in the presence of the linear inhomogeneity of the plasma are obtained. it is observed that by increasing the number of modes, the group velocity and amplitude of the electric field decrease. It is also studied the conservation of particles in collisionless and collisional plasmas. It is obtained that the nonlinear electromagnetic waves in collisionless inhomogeneous plasmas are susceptible to stimulated Brillouin backscattering. Finally, it is indicated that by increasing the number of modes, the growth rate of the instability increases.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101214"},"PeriodicalIF":1.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597125","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":"Gravitational interplay and cosmic evolution: The role of f(Q,Lm) theory","authors":"M. Sharif ,&nbsp;M. Zeeshan Gul ,&nbsp;Rida Mahmood","doi":"10.1016/j.hedp.2025.101212","DOIUrl":"10.1016/j.hedp.2025.101212","url":null,"abstract":"<div><div>This manuscript investigates the viable cosmological bounce solutions in the non-metric gravity represented by the function <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></mrow></mrow></math></span>, where <span><math><mi>Q</mi></math></span> is non-metricity and <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> defines the matter-Lagrangian density. For this purpose, we analyze anisotropic flat metric with a perfect matter distribution to examine the cosmic mysteries. We study the impact of this gravitational proposal on the cosmic evolution by considering two distinct <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></mrow></mrow></math></span> functional forms. Further, we investigate the behavior of different cosmological parameters to investigate the existence of viable cosmological bounce solutions. The analysis shows that the null energy condition is violated, which indicates that the singularity problem can be addressed in this extended theoretical framework. Our findings suggest that this modified gravitational theory provides an alternative framework to standard cosmology, offering insights into gravitational interactions and the early cosmic evolution.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101212"},"PeriodicalIF":1.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614292","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":"Electron density in air laser plasma created by femtosecond pulses of laser radiation","authors":"I.A. Zyatikov,&nbsp;V.F. Losev","doi":"10.1016/j.hedp.2025.101190","DOIUrl":"10.1016/j.hedp.2025.101190","url":null,"abstract":"<div><div>The results of experimental studies of electron density in air laser plasma, created by femtosecond radiation pulse at the wavelength of 950 nm and 60 fs duration are presented. Laser pulse was focused by lens with focal lengths from 15 to 100 cm to create a laser plasma. Electron density was determined from specific deposited energy in plasma. It is shown that when changing the specific deposited energy from 0.4 to 10 J/cm³ the electron density in plasma changes from 1.7⸱10¹⁷ to 3.9⸱10¹⁸ cm⁻³. Qualitative estimates of ionization mechanisms based on calculations of Keldysh parameter are carried out. It is shown that in our experimental conditions the main mechanism is multiphoton ionization.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"55 ","pages":"Article 101190"},"PeriodicalIF":1.6,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679260","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":"Estimate calculation of discrete energy levels in the hydrogen atom using an indeterministic method","authors":"Usama Afzal","doi":"10.1016/j.hedp.2025.101192","DOIUrl":"10.1016/j.hedp.2025.101192","url":null,"abstract":"<div><div>In the present study, we use the indeterministic method based on uncertainty conditions to estimate the discrete energy levels of hydrogen atoms. We analyze in detail how transitions from the ground state (<em>n</em> = 1) to the first excited state (<em>n</em> = 2) occur by dividing into sub-states and introducing the indeterminacy concept. The calculated energy levels expressed that as the indeterminacy changes, the energy level increases from -13.60 eV to -3.40 eV and there is observed a decrease in energy required to transition from each sub-state to <em>n</em> = 2. Such as for the transition from <em>n</em> = 1.1 to <em>n</em> = 2.0 there is a need for 9.18 eV. As a result, it is found that our new approach exploits the uncertainty principle to reveal deep trends in the energy transition. This work has significant implications for atomic physics and energy applications, spectroscopy and quantum mechanics. Our findings demonstrate the potential of imprecise data to contribute significantly to scientific understanding.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"55 ","pages":"Article 101192"},"PeriodicalIF":1.6,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679261","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":"Exploring the generalized fifth-order (2 + 1)-dimensional KdV equation: The lump structures and collision phenomena to the shallow water under gravity and nonlinear lattice","authors":"Usman Younas ,&nbsp;Tukur Abdulkadir Sulaiman ,&nbsp;Hajar Farhan Ismael ,&nbsp;Patient Zihisire Muke","doi":"10.1016/j.hedp.2025.101186","DOIUrl":"10.1016/j.hedp.2025.101186","url":null,"abstract":"<div><div>This study deals the lump structures and interaction phenomena to the (2 + 1)-dimensional generalized fifth-order KdV (2GKdV) equation which demonstrates long wave movements under the gravity field and in a two-dimensional nonlinear lattice in shallow water. A variety of solutions like lump periodic, collision between lumps and hyperbolic solutions as well as exponential solutions, breather waves, two wave solutions are under consideration. The Hirota perturbation expansion technique with setting nonzero background wave has been adopted for investing the studied model and securing the solutions. A lump solution is a rational function solution which is real analytic and decays in all directions of space variables. Breather waves refer to solitary waves that exhibit both partial localization and periodic structure in either space or time. Breathers serve crucial functions in nonlinear physics and have been observed in various physical domains, including optics, hydrodynamics, and quantized superfluidity. The specified parameter values produce a variety of graphs with distinctive shapes to visually represent the results. The technique’s performance, clarity, and visibility are highlighted in its suitability for various nonlinear equations in computational physics and other research domains, illustrating collision-related components and solution properties.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"55 ","pages":"Article 101186"},"PeriodicalIF":1.6,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679262","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":"Overview of oxygen opacity experiments at the national ignition facility and investigation of potential systematic errors","authors":"D.C. Mayes ,&nbsp;B.A. Hobbs ,&nbsp;R.F. Heeter ,&nbsp;T.S. Perry ,&nbsp;H.M. Johns ,&nbsp;Y.P. Opachich ,&nbsp;M. Hohenberger ,&nbsp;P.A. Bradley ,&nbsp;E.C. Dutra ,&nbsp;C.J. Fontes ,&nbsp;E. Gallardo-Diaz ,&nbsp;M.H. Montgomery ,&nbsp;H.F. Robey ,&nbsp;M.S. Wallace ,&nbsp;D.E. Winget","doi":"10.1016/j.hedp.2025.101177","DOIUrl":"10.1016/j.hedp.2025.101177","url":null,"abstract":"<div><div>Experiments to measure oxygen opacity at stellar interior conditions have been performed at the National Ignition Facility in a Discovery Science campaign. These experiments utilize the Opacity-on-NIF platform with a sample comprised of O, Mg, and Si. The spectral data from the Opacity Spectrometer cover the 1000–2000 eV photon energy range showing bound-free continuum absorption from O and line absorption from Mg and Si. DANTE and the Gated X-ray Detector are employed to measure the sample plasma’s temperature and density, respectively. Initial data show lower transmission than expected by theoretical models, raising questions of whether potential background or data uniformity concerns could produce systematic errors in the inferred transmission. Here, we investigate three concerns thought to be important for the oxygen opacity data, including instrumental scattered background, sample self-emission non-uniformity, and backlight continuum non-uniformity. Additionally, we show the effect of a recently developed method to account for 2nd order crystal reflection. The total effect of these concerns on one experiment is found to be small compared to the observed difference between the inferred transmission and a model calculation at the inferred temperature and density. Thus, we conclude that these potential sources of systematic error cannot account for the observed difference, increasing the likelihood of a real effect due to the high temperature and density conditions. However, because this is only a single experiment, we cannot make a firm conclusion. More experiments measuring the opacity and necessary calibrations are needed to assess the reproducibility and uncertainty of this result.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"55 ","pages":"Article 101177"},"PeriodicalIF":1.6,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534747","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}