High Energy Density Physics最新文献

{"title":"Observational and stability analysis of viscosity-driven cosmic acceleration in f(Q,C) gravity","authors":"Amit Samaddar,&nbsp;S. Surendra Singh","doi":"10.1016/j.hedp.2025.101216","DOIUrl":"10.1016/j.hedp.2025.101216","url":null,"abstract":"<div><div>This research explores the potential impact of viscosity by using the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>C</mi><mo>)</mo></mrow></mrow></math></span> gravity. We consider two functional forms: <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>C</mi><mo>)</mo></mrow><mo>=</mo><mi>α</mi><msup><mrow><mi>Q</mi></mrow><mrow><mi>δ</mi></mrow></msup><mo>+</mo><mi>β</mi><mi>C</mi></mrow></math></span> and <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><mi>C</mi><mo>)</mo></mrow><mo>=</mo><mi>α</mi><msqrt><mrow><mo>−</mo><mi>Q</mi></mrow></msqrt><mo>+</mo><mi>β</mi><mi>C</mi><mo>+</mo><mi>γ</mi><mi>Q</mi></mrow></math></span>, along with a viscous pressure parameterized by <span><math><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>=</mo><mi>p</mi><mo>−</mo><mn>3</mn><msub><mrow><mi>ζ</mi></mrow><mrow><mn>0</mn></mrow></msub><mi>ρ</mi><mi>H</mi></mrow></math></span>. Using observational datasets (CC 46, BAO 15 and Pantheon 1048) and MCMC techniques, we constrain model parameters and analyze key cosmological quantities. Our investigation reveals a transition from a decelerating to an accelerating phase, characterized by values of <span><math><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>z</mi></mrow><mrow><mi>t</mi><mi>r</mi></mrow></msub></math></span> that are compatible with the observational constraints. The equation of state parameter <span><math><mi>ω</mi></math></span> approaches <span><math><mrow><mo>−</mo><mn>1</mn></mrow></math></span>, signaling a late-time acceleration, while the energy conditions indicate a persistent violation of the SEC alongside the stability of NEC, WEC and DEC. Statefinder diagnostics reveal a transition toward <span><math><mi>Λ</mi></math></span>CDM-like behavior and the sound speed squared remains positive which ensure model stability throughout cosmic evolution. Our models provide a viable alternative to standard cosmological frameworks, with potential implications for understanding the influence of viscosity in the Universe’s late-time dynamics.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101216"},"PeriodicalIF":0.9,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749001","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":"2025-07-04","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":"Tidal dynamics and geodesic divergence in the magnetically charged black holes spacetime","authors":"Allah Ditta ,&nbsp;Irfan Mahmood ,&nbsp;Hira Sohail ,&nbsp;Farruh Atamurotov ,&nbsp;Yousef Mohammed Alanazi ,&nbsp;Abaid ur Rehman Virk","doi":"10.1016/j.hedp.2025.101215","DOIUrl":"10.1016/j.hedp.2025.101215","url":null,"abstract":"<div><div>In this study, we explore the tidal effects within the spacetime of a magnetically charged black hole. Our investigation reveals that increasing the magnetic charge leads to a decrease in the radial tidal effect, contrasting with the behavior observed in the angular tidal force. Additionally, we find that the sign of the tidal force’s radial and angular components alternates between the event horizon and the Cauchy horizon. Furthermore, by solving the geodesic divergence equation for two distinct initial conditions of radially free-falling entities toward the black hole, we derive the geodesic divergence vector. These findings contribute to our understanding of the gravitational dynamics in magnetically charged black holes.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101215"},"PeriodicalIF":1.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523031","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 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":"2025-06-28","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":"Observation of laser-driven and shock-driven preheat effects on 3D-printed, two-photon polymerization plastic lattices","authors":"R.W. VanDervort,&nbsp;N. Christiansen,&nbsp;T. Coffman,&nbsp;L.M. Green,&nbsp;B.M. Haines,&nbsp;K. Ma,&nbsp;Y. Kim,&nbsp;P.M. Kozlowski,&nbsp;R. Lester,&nbsp;D.W. Schmidt,&nbsp;C. Wong","doi":"10.1016/j.hedp.2025.101210","DOIUrl":"10.1016/j.hedp.2025.101210","url":null,"abstract":"<div><div>Los Alamos National Laboratory’s Bosque campaign on the National Ignition Facility (NIF) seeks to understand how the mix of shell materials and fusion reactants effects the deuterium-tritium (DT) fusion rate in an inertially confined fusion capsule. The NIF platform uses deuterium in a plastic, 3D-printed, two-photon polymerization (2PP) lattice inside the capsule. The voids between the matrix of lattices is filled by tritium gas. Preheat expands the individual lattice struts, which causes deuterium and tritium to prematurely mix before the capsule converges. This preheat is assumed to be created by either laser plasma interactions (LPI) or radiation from the shock. Capsule initial conditions are sensitive to sources of preheat, which necessitates a comprehensive study of how preheat interacts with the lattice.</div><div>In this work, results from a shock-tube campaign conducted on the Omega Laser Facility to study the impacts of preheat on a 2PP, 3D-printed lattice is discussed. In these experiments, OMEGA 60 laser beams directly irradiated a plastic ablator (I<span><math><mrow><mo>∼</mo><mn>8</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>14</mn></mrow></msup></mrow></math></span> W/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>), which created both a source of hot-electrons and a radiative shock to preheat the lattice. Expansion of a witness disk is radiographically imaged due to the small size of the lattice struts. We attempted to isolate the preheat source to only the radiative shock by including a thin-gold foil in select ablators to mitigated hot-electron preheat. However, we found that the gold layer reduced the shock speed in the lattice from a plastic only case of <span><math><mrow><mn>86</mn><mo>.</mo><mn>0</mn><mspace></mspace><mi>μ</mi></mrow></math></span>m/ns to <span><math><mrow><mn>51</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>/ns. The gold layer is estimated to dramatically reduce the radiative preheat due to slowing of the shock, while the hot electron energy is only mildly reduced. Measurements of the witness disk expansion were likely scattered due to the nearby lattice having a similar average areal density to that of the edge of the witness disk. The uncertainties of these measurements are large and more experimental measurements with target design changes are needed to clarify the impacts of preheat on the lattice expansion.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101210"},"PeriodicalIF":1.6,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571935","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 charge on anisotropic extensions of the Tolman IV solution in Rastall theory","authors":"M. Sharif ,&nbsp;Malick Sallah","doi":"10.1016/j.hedp.2025.101208","DOIUrl":"10.1016/j.hedp.2025.101208","url":null,"abstract":"<div><div>This study presents exact anisotropic spherical solutions for static self-gravitating systems using the extended geometric deformation scheme of gravitational decoupling within the framework of Rastall gravity. Beginning with the isotropic Tolman IV solution in the presence of an electric field, we introduce anisotropy by modifying both the temporal and radial metric potentials. This approach yields two distinct models based on the mimic pressure and mimic density constraints. We analyze the influence of the Rastall parameter, electric charge, and decoupling parameter on the extended solutions and examine key physical properties, including viability, stability, and equilibrium. For our analysis, we consider the compact stellar object <em>SMC X-1</em>, characterized by a mass <span><math><mrow><mi>M</mi><mo>=</mo><mn>1</mn><mo>.</mo><mn>534</mn><mspace></mspace><mtext>km</mtext></mrow></math></span> and a radius <span><math><mrow><mi>I</mi><mo>=</mo><mn>9</mn><mo>.</mo><mn>34</mn><mspace></mspace><mtext>km</mtext></mrow></math></span>. Our findings indicate that both models satisfy physical viability conditions as well as stability. Additionally, we establish that the Tolman IV ansatz remains unaffected by the presence of an electric field within the Rastall gravity framework.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101208"},"PeriodicalIF":1.6,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365932","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":"2025-06-21","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":"Complex pseudo-partition functions in the Configurationally-Resolved Super-Transition-Array approach for radiative opacity","authors":"Jean-Christophe Pain","doi":"10.1016/j.hedp.2025.101200","DOIUrl":"10.1016/j.hedp.2025.101200","url":null,"abstract":"<div><div>A few years ago, Kurzweil and Hazak developed the Configurationally Resolved Super-Transition-Arrays (CRSTA) method for the computation of hot-plasma radiative opacity. Their approach, based on a temporal integration, is an important refinement of the standard Super-Transition-Arrays (STA) approach, which enables one to recover the underlying structure of the STAs, made of unresolved transition arrays. The CRSTA formalism relies on the use of complex pseudo partition functions, depending on the considered one-electron jump. In this article, we find that, despite the imaginary part, the doubly-recursive relation which was introduced in the original STA method to avoid problems due to alternating-sign terms in partition functions, is still applicable, robust, efficient, and exempt of numerical instabilities. This was rather unexpected, in particular because of the occurrence of trigonometric functions, or Chebyshev polynomials, which can be either positive or negative. We also show that, in the complex case, the recursion relation can be presented in a form where the vector of real and imaginary parts at a given iteration is therefore obtained by a sum of the rotated previous ones.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101200"},"PeriodicalIF":1.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306543","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":"Measurement of the impulse from a magnetic nozzle for the model experiment of laser fusion rocket","authors":"Kento Koba ,&nbsp;Taichi Morita ,&nbsp;Hideki Nakashima ,&nbsp;Shinichi Namba ,&nbsp;Yoshitaka Mori ,&nbsp;Toshiyuki Ise ,&nbsp;Shunsuke Murata ,&nbsp;Atsushi Sunahara ,&nbsp;Yoshihiro Kajimura ,&nbsp;Masafumi Edamoto ,&nbsp;Nathan Schilling ,&nbsp;Naoji Yamamoto","doi":"10.1016/j.hedp.2025.101213","DOIUrl":"10.1016/j.hedp.2025.101213","url":null,"abstract":"<div><div>Magnetic nozzle is a component of a propulsion system which obtain thrust from a plasma in a magnetic field. Previous works have investigated the plasma behavior and thrust performance of the magnetic nozzle through experiment and simulation. A thrust stand with a pendulum has been used to experimentally evaluate the impulse bit generated by magnetic nozzle. A direct method, which measures the impulse bit on the magnet by putting it on the pendulum, may be difficult to measure the displacement because of the vibration. An indirect (target) method, which measures the impulse of the plasma accelerated by the magnetic nozzle, can be applied for large pulsed-electromagnets, but may be difficult to measure all of the impulse because of the limited detectable area. Here, we performed two impulse bit measurements with pendulum methods for the same magnetic nozzle. Also, we measured ion current at the same position of the target measurement to investigate the ion extraction from the nozzle. Although the obtained impulse bits are different, the target measurement reproduced the similar energy dependence as the simulation results. In addition, the spatial distribution of ions discharged downstream of the magnetic nozzle could be obtained by ion measurement. Combining these results suggests the possibility of evaluating impulses by target measurement in the future.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101213"},"PeriodicalIF":1.6,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306544","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":"Evaluation of tissue-air ratios (TAR) for various tissue-equivalent materials in diagnostic radiology","authors":"Hamza Sekkat ,&nbsp;Abdellah Khallouqi ,&nbsp;Omar El rhazouani","doi":"10.1016/j.hedp.2025.101209","DOIUrl":"10.1016/j.hedp.2025.101209","url":null,"abstract":"<div><div>Tissue-air ratios (TAR) are fundamental in diagnostic radiology dosimetry, yet limited data exist for polymethyl methacrylate (PMMA) and epoxy resin in conventional X-ray energy ranges. This study experimentally determines TAR using an epoxy resin phantom and validates the results through Monte Carlo (MC) simulations with the Geant4/GATE toolkit. An epoxy resin phantom (1.20 g/cm³) was fabricated, and optically stimulated luminescence dosimeters (OSLDs) measured dose at depths of 2, 4, 6, 8, and 10 cm within epoxy resin, PMMA, and air. A digital X-ray system (40–150 kV) provided the exposure conditions. MC simulations modeled photon transport with a monoenergetic beam (10–150 keV) and phase-space detectors. TAR results showed epoxy resin closely matched PMMA, with deviations of &lt;5 % at low energies (&lt;60 keV) and increasing up to 8 % at higher voltages (≥100 kV). Compared to water and soft tissue, epoxy resin exhibited TAR deviations within 6 % across all depths, confirming its dosimetric suitability. At higher beam qualities, beam hardening effects led to slight TAR overestimations in epoxy resin compared to water, whereas PMMA demonstrated similar trends but with marginally lower values. Despite these variations, epoxy resin TAR remained within acceptable limits, supporting its application as a soft tissue-equivalent material in dosimetric studies.</div></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"56 ","pages":"Article 101209"},"PeriodicalIF":1.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203950","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}