Journal of High Energy Astrophysics最新文献

Testing f(T) gravity with cosmological observations: Confronting the Hubble tension and implications for the late-time universe 用宇宙学观测检验f(T)引力：面对哈勃的张力和对晚期宇宙的影响

IF 10.5 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-29 DOI: 10.1016/j.jheap.2025.100440

Saurabh Verma , Archana Dixit , Anirudh Pradhan , M.S. Barak

{"title":"Testing f(T) gravity with cosmological observations: Confronting the Hubble tension and implications for the late-time universe","authors":"Saurabh Verma , Archana Dixit , Anirudh Pradhan , M.S. Barak","doi":"10.1016/j.jheap.2025.100440","DOIUrl":"10.1016/j.jheap.2025.100440","url":null,"abstract":"<div><div>In recent years, modifications to General Relativity (GR) have been explored to address cosmological observations, particularly in the context of late-time cosmic acceleration. Among these, modifications based on the Teleparallel Equivalent of General Relativity (TEGR), particularly <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> gravity, have gained significant attention. In this work, we investigate the scalar perturbations in <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> gravity, focusing on how these perturbations modify the Poisson and lensing equations and how they impact cosmological observables. By incorporating observational data from cosmic chromatometers, Big Bang nucleosynthesis, the DESI BAO survey, and Type Ia Supernovae (SNe Ia), we derive constraints on the parameters of the <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> power-law model. Our results suggest that <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> gravity can effectively alleviate some of the tensions observed in the standard ΛCDM model, including the Hubble constant (<span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>) discrepancy. Furthermore, the evolution of the supernova luminosity and its dependence on the gravitational constant are considered to refine the measurement of cosmological parameters. The model's ability to address the <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> tension is critically examined, and we find that <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> gravity offers a viable alternative to the standard model. The work concludes by comparing the fits of the <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> gravity model to the ΛCDM model using various information criteria, revealing key insights into the viability of modified gravity in contemporary cosmology.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"49 ","pages":"Article 100440"},"PeriodicalIF":10.5,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724277","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}

引用次数: 0

Model-independent calibration of Gamma-Ray Bursts with neural networks 基于神经网络的伽马射线暴模型独立校准

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-25 DOI: 10.1016/j.jheap.2025.100439

Purba Mukherjee , Maria Giovanna Dainotti , Konstantinos F. Dialektopoulos , Jackson Levi Said , Jurgen Mifsud

{"title":"Model-independent calibration of Gamma-Ray Bursts with neural networks","authors":"Purba Mukherjee , Maria Giovanna Dainotti , Konstantinos F. Dialektopoulos , Jackson Levi Said , Jurgen Mifsud","doi":"10.1016/j.jheap.2025.100439","DOIUrl":"10.1016/j.jheap.2025.100439","url":null,"abstract":"<div><div>The Λ Cold Dark Matter (ΛCDM) cosmological model has been highly successful in predicting cosmic structure and evolution, yet recent precision measurements have highlighted discrepancies, especially in the Hubble constant inferred from local and early-Universe data. Gamma-ray bursts (GRBs) present a promising alternative for cosmological measurements, capable of reaching higher redshifts than traditional distance indicators. This work leverages GRBs to refine cosmological parameters independently of the ΛCDM framework. Using the Platinum compilation of long GRBs, we calibrate the Dainotti relations—empirical correlations among GRB luminosity properties—as standard candles through artificial neural networks (ANNs). We analyze both the 2D and 3D Dainotti calibration relations, leveraging an ANN-driven Markov Chain Monte Carlo approach to minimize scatter in the calibration parameters, thereby achieving a stable Hubble diagram. This ANN-based calibration approach offers advantages over Gaussian processes, avoiding issues such as kernel function dependence and overfitting. Our results emphasize the need for model-independent calibration approaches to address systematic challenges in GRB luminosity variability, ultimately extending the cosmic distance ladder in a robust way. By addressing redshift evolution and reducing systematic uncertainties, GRBs can serve as reliable high-redshift distance indicators, offering critical insights into current cosmological tensions.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"49 ","pages":"Article 100439"},"PeriodicalIF":10.2,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713615","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}

引用次数: 0

Does DESI 2024 confirm ΛCDM? 清洁发展机制2024 doc DESI confirmΛ?

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-23 DOI: 10.1016/j.jheap.2025.100428

E. Ó Colgáin , M.G. Dainotti , S. Capozziello , S. Pourojaghi , M.M. Sheikh-Jabbari , D. Stojkovic

{"title":"Does DESI 2024 confirm ΛCDM?","authors":"E. Ó Colgáin , M.G. Dainotti , S. Capozziello , S. Pourojaghi , M.M. Sheikh-Jabbari , D. Stojkovic","doi":"10.1016/j.jheap.2025.100428","DOIUrl":"10.1016/j.jheap.2025.100428","url":null,"abstract":"<div><div>We demonstrate that a <span><math><mo>∼</mo><mn>2</mn><mi>σ</mi></math></span> discrepancy with the Planck-ΛCDM cosmology in DESI Luminous Red Galaxy (LRG) data in the redshift range <span><math><mn>0.4</mn><mo><</mo><mi>z</mi><mo><</mo><mn>0.6</mn></math></span> with effective redshift <span><math><msub><mrow><mi>z</mi></mrow><mrow><mtext>eff</mtext></mrow></msub><mo>=</mo><mn>0.51</mn></math></span> translates into an unexpectedly large <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> value, <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><msubsup><mrow><mn>0.67</mn></mrow><mrow><mo>−</mo><mn>0.17</mn></mrow><mrow><mo>+</mo><mn>0.18</mn></mrow></msubsup></math></span>. We independently confirm that this anomaly drives the preference for <span><math><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>></mo><mo>−</mo><mn>1</mn></math></span> in DESI data <em>alone</em> confronted to the <span><math><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span>CDM model. Given that LRG data at <span><math><msub><mrow><mi>z</mi></mrow><mrow><mtext>eff</mtext></mrow></msub><mo>=</mo><mn>0.51</mn></math></span> is at odds with Type Ia supernovae in overlapping redshifts, we expect that this anomaly will decrease in statistical significance with future DESI data releases leaving an increasing <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> trend with effective redshift at higher redshifts. We estimate the current significance of the latter in DESI data at <span><math><mo>∼</mo><mn>1.8</mn><mi>σ</mi></math></span> and comment on how it dovetails with independent observations. It is imperative to understand what makes DESI LRG data at <span><math><msub><mrow><mi>z</mi></mrow><mrow><mtext>eff</mtext></mrow></msub><mo>=</mo><mn>0.51</mn></math></span> an outlier when it comes to <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> determinations.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"49 ","pages":"Article 100428"},"PeriodicalIF":10.2,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713684","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}

引用次数: 0

Study on the magnetic field of the ultraluminous X-ray pulsar RX J0209.6-7427 超亮x射线脉冲星RX J0209.6-7427的磁场研究

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-23 DOI: 10.1016/j.jheap.2025.100429

Amar Deo Chandra

{"title":"Study on the magnetic field of the ultraluminous X-ray pulsar RX J0209.6-7427","authors":"Amar Deo Chandra","doi":"10.1016/j.jheap.2025.100429","DOIUrl":"10.1016/j.jheap.2025.100429","url":null,"abstract":"<div><div>RX J0209.6-7427 is an ultraluminous X-ray pulsar (ULXP) having spin period of about 9.3 s. To date, no cyclotron resonance scattering features have been detected in this source, which can enable direct measurement of the magnetic field of the pulsar. We estimate the surface magnetic field of the neutron star in this source using different models and find that the inferred magnetic field lies in the range of <span><math><mn>2.4</mn><mo>−</mo><mn>4</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>13</mn></mrow></msup></math></span> G. We study the magnetic field and spin period evolution of the source using existing models and find that the magnetic field will decay to about <span><math><mo>∼</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>9</mn></mrow></msup></math></span> G assuming steady accretion and the source will become a millisecond pulsar at the end of the accretion phase of the accreting binary. Comparison between the magnetic field and the spin period of other ULXPs with those of magnetars suggests that some ULXPs may have magnetar-like strong dipolar magnetic fields. Studying the magnetic and spin period evolution of ULXPs may be helpful for understanding magnetar evolution and the millisecond pulsar formation.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"49 ","pages":"Article 100429"},"PeriodicalIF":10.2,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695389","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}

引用次数: 0

Constraints on Barrow and Tsallis holographic dark energy from DESI DR2 BAO data DESI DR2 BAO数据对Barrow和Tsallis全息暗能量的约束

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-22 DOI: 10.1016/j.jheap.2025.100427

Giuseppe Gaetano Luciano , Andronikos Paliathanasis , Emmanuel N. Saridakis

{"title":"Constraints on Barrow and Tsallis holographic dark energy from DESI DR2 BAO data","authors":"Giuseppe Gaetano Luciano , Andronikos Paliathanasis , Emmanuel N. Saridakis","doi":"10.1016/j.jheap.2025.100427","DOIUrl":"10.1016/j.jheap.2025.100427","url":null,"abstract":"<div><div>Barrow and Tsallis Holographic Dark Energy (HDE) are two recently proposed extensions of the standard HDE framework, incorporating generalized corrections to horizon entropy through the use of Barrow and Tsallis entropies. Tsallis entropy arises from non-extensive statistical phenomena which account for long-range correlations and deviations from additivity, while Barrow entropy emerges from quantum-gravitational effects on the horizon geometry, associated with fractal modifications and deformations. At the cosmological level, both scenarios lead to the same equations, nevertheless the involved parameters obey different theoretical bounds. In this work, we use observational data from Supernova Type Ia (SNIa), Cosmic Chronometers (CC) and Baryonic acoustic oscillations (BAO), including the recently released DESI DR2 dataset, to place constraints on both scenaria. We show that both can be in agreement with observations, although they cannot alleviate the <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> tension. However, applying information criteria we deduce that both of them are not favoured comparing to ΛCDM concordance cosmological paradigm.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"49 ","pages":"Article 100427"},"PeriodicalIF":10.2,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695434","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}

引用次数: 0

Quasi-Periodic Oscillations due to radiative feedback mechanism between the disc and corona 星盘和日冕之间的辐射反馈机制引起的准周期振荡

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-21 DOI: 10.1016/j.jheap.2025.100426

Akash Garg , Ranjeev Misra , Somasri Sen

引用次数: 0

Rotating charged nonsingular black holes in loop quantum gravity and their observational imprints from EHT 环量子引力中的旋转带电非奇异黑洞及其EHT的观测印记

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-18 DOI: 10.1016/j.jheap.2025.100425

Yassine Sekhmani , Heena Ali , Sushant G. Ghosh , Kuantay Boshkayev

引用次数: 0

Epicyclic oscillations and accretion disk around a special Buchdahl-inspired spacetime 一个特殊布赫启发时空周围的周转振荡和吸积盘

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-15 DOI: 10.1016/j.jheap.2025.100424

Mirzabek Alloqulov , Mubasher Jamil , Sanjar Shaymatov , Qiang Wu , Mustapha Azreg-Aïnou

{"title":"Epicyclic oscillations and accretion disk around a special Buchdahl-inspired spacetime","authors":"Mirzabek Alloqulov , Mubasher Jamil , Sanjar Shaymatov , Qiang Wu , Mustapha Azreg-Aïnou","doi":"10.1016/j.jheap.2025.100424","DOIUrl":"10.1016/j.jheap.2025.100424","url":null,"abstract":"<div><div>In this paper, we consider the Buchdahl-inspired spacetime metric and investigate its aspects using the quasiperiodic oscillations and the accretion disk due to the accreting matter. First, we focus on analyzing the geodesics of particles around the Buchdahl-inspired spacetime, together with the conserved quantities such as specific energy and angular momentum for massive particles orbiting on the innermost stable circular orbits (ISCOs). We show that the effect of the Buchdahl parameter <span><math><mover><mrow><mi>k</mi></mrow><mrow><mo>˜</mo></mrow></mover></math></span> increases as the radii of the ISCO orbits decrease, resulting in shifting orbits toward the central object compared to the Schwarzschild black hole case. We also consider astrophysical epicyclic oscillations and derive their general expressions using implications of circular motion of massive particles around the Buchdahl-inspired spacetime. Further, we explore the astrophysical implications of observational higher-frequency QPOs of the selected galactic microquasars of X-ray binary systems to obtain the best-fit constraints on the Buchdahl-inspired spacetime parameters. Finally, we consider the accretion disk around the Buchdahl-inspired spacetime using implications of the ISCO parameters that define the accretion disk's inner edge. We explore radiation properties of the accretion disk and redshifted image and intensity of a lensed accretion disk around the Buchdahl-inspired spacetime.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"48 ","pages":"Article 100424"},"PeriodicalIF":10.2,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653399","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}

引用次数: 0

Constraining exponential f(Q) gravity with cosmic chronometers and Supernovae: A data-driven analysis 约束指数f(Q)重力与宇宙计时器和超新星：一个数据驱动的分析

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-11 DOI: 10.1016/j.jheap.2025.100422

Sanjeeda Sultana, Surajit Chattopadhyay

{"title":"Constraining exponential f(Q) gravity with cosmic chronometers and Supernovae: A data-driven analysis","authors":"Sanjeeda Sultana, Surajit Chattopadhyay","doi":"10.1016/j.jheap.2025.100422","DOIUrl":"10.1016/j.jheap.2025.100422","url":null,"abstract":"<div><div>The current paper reports an investigation of the cosmological implications of symmetric teleparallel gravity within a modified <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> theory. We construct a specific exponential <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> model as <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo><mo>=</mo><mi>Q</mi><mo>+</mo><msub><mrow><mi>η</mi></mrow><mrow><mn>1</mn></mrow></msub><msub><mrow><mi>Q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>(</mo><mn>1</mn><mo>−</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn></mrow></msub><msqrt><mrow><mi>Q</mi><mo>/</mo><msub><mrow><mi>Q</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></msqrt></mrow></msup><mo>)</mo></math></span>, designed to smoothly deviate from General Relativity and accommodate both early-time inflation and late-time accelerated expansion. By employing Markov Chain Monte Carlo (MCMC) methods, we constrain the model parameters <span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>, <span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, and <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><msub><mrow><mi>m</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></msub></math></span> using a combination of cosmic chronometers (CC), Pantheon, and Pantheon<sup>+</sup> Supernovae datasets. Our analysis demonstrates that the model consistently supports a late-time acceleration scenario and is in good agreement with current cosmological observations. We extensively analyze the dynamical behavior of the model using key cosmological diagnostics, including the deceleration parameter, equation of state, energy density parameters, Statefinder, and Om diagnostics. The reconstructed Hubble parameter <span><math><mi>H</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> and distance modulus <span><math><mi>μ</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> show strong consistency with ΛCDM and observational data, while subtle deviations at higher redshifts highlight the value of multi-probe observations. In addition, the examination of energy conditions shows that, in accordance with cosmic acceleration, the Strong Energy Condition (SEC) is broken at lower redshifts while the Dominant Energy Condition (DEC) and Null Energy Condition (NEC) are satisfied. Cosmic age estimates from the model are consistently in agreement with Planck constraints. Our results indicate the viability of exponential <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity providing a consistent framework for exploring cosmic evolution and highlighting the significance of multi-probe cosmological measurements for further developments. A comparative statistical analysis reveals that while ΛCDM remains statistically preferred based on AIC and BIC criteri","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"48 ","pages":"Article 100422"},"PeriodicalIF":10.2,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632567","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}

引用次数: 0

Pair production due to absorption of 2.2 MeV photons in magnetospheres of X-ray pulsars x射线脉冲星磁球吸收2.2 MeV光子产生对

IF 10.2 4区物理与天体物理

Journal of High Energy Astrophysics Pub Date : 2025-07-08 DOI: 10.1016/j.jheap.2025.100420

Emir Tataroglu , Alexander A. Mushtukov

{"title":"Pair production due to absorption of 2.2 MeV photons in magnetospheres of X-ray pulsars","authors":"Emir Tataroglu , Alexander A. Mushtukov","doi":"10.1016/j.jheap.2025.100420","DOIUrl":"10.1016/j.jheap.2025.100420","url":null,"abstract":"<div><div>Accretion onto strongly magnetized neutron stars in X-ray pulsars (XRPs) produces intense X-ray emission and gamma-ray photons, the latter arising from nuclear reactions and high-energy particle collisions in the stellar atmosphere. These gamma-rays interact with the magnetic field via one- and two-photon pair creation processes, generating electron-positron pairs. We investigate one-photon pair production in sub-critical XRPs, with a focus on how surface magnetic field strength affects gamma-ray absorption in the magnetosphere. Using general relativistic photon trajectory simulations, we map the spatial distribution of pair creation sites and quantify absorption efficiencies. We find that XRPs with surface fields <span><math><mi>B</mi><mo>≲</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>G</mi></math></span> are largely transparent to 2.2MeV gamma-rays, while fields <span><math><mi>B</mi><mo>≳</mo><mn>3</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>G</mi></math></span> lead to efficient absorption within a few tens of centimeters from the surface. For lower field strengths, absorption can occur at larger distances and outside the accretion column, offering a potential channel for radio emission. Our results provide new insight into the interplay between nuclear processes, magnetospheric structure, and multiwavelength radiation in XRPs.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"48 ","pages":"Article 100420"},"PeriodicalIF":10.2,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579208","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}

引用次数: 0