Journal of High Energy Astrophysics最新文献

{"title":"Dynamics of an interacting matter − f(R) model with expansion histories approximating ΛCDM","authors":"Jianwen Liu,&nbsp;Fabao Gao,&nbsp;Ruifang Wang,&nbsp;Aqeela Razzaq","doi":"10.1016/j.jheap.2025.100383","DOIUrl":"10.1016/j.jheap.2025.100383","url":null,"abstract":"<div><div>The paper examines the cosmological dynamics of a <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> model that integrates interactions between matter and an effective fluid. It employs a dynamical system approach with three cosmographic parameters. The equilibrium state's physical characteristics and linear stability within the cosmological dynamical system, derived from the field equations, are examined, taking into account an interacting term <span><math><mi>Q</mi><mo>=</mo><mn>3</mn><mi>α</mi><mi>H</mi><mi>ρ</mi></math></span> and the specific relationships among cosmological parameters as per ΛCDM cosmology. It is found that the solutions of the model, while imposing a global ΛCDM alike evolution, exhibit significant sensitivity to initial conditions when evaluating cosmological parameters, primarily due to the phase-space constraints imposed by the viability conditions for <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> models. The presence of the interacting term alters most equilibrium points in the system and contributes to the cosmological evolution, imposing constraints on the parameter <em>α</em> of interaction strength. Additionally, by using Poincaré compactification, we conduct a global dynamics analysis for the spatially flat scenario, revealing all possible evolutions of the flat universe in the form of a Poincaré disk and a comprehensive dynamic flow chart. Several equilibrium points and the cosmological evolution within this model exhibit slight deviations from the non-interacting case, yet it successfully captures the universe's acceleration phase.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100383"},"PeriodicalIF":10.2,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833813","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":"Low frequency radio observation of the dark PeVatron 1LHAASO J2108+5153u using uGMRT","authors":"Gunindra Krishna Mahanta ,&nbsp;Subhashis Roy ,&nbsp;Sagar Godambe ,&nbsp;Bitan Ghosal ,&nbsp;Nilay Bhatt ,&nbsp;Subir Bhattacharyya","doi":"10.1016/j.jheap.2025.100381","DOIUrl":"10.1016/j.jheap.2025.100381","url":null,"abstract":"<div><div>1LHAASO J2108+5153u, a PeVatron candidate detected by Large High Altitude Air Shower Observatory (LHAASO), has no known association in any other wavelength range. In this work we attempted to identify any possible association by observing the source region in low frequency radio band. 1LHAASO J2108+5153u was observed by upgraded Giant Metrewave Radio Telescope (uGMRT) at 650 MHz frequency. The data were analysed to map and spatially correlate the sources in the field of view with the LHAASO detected source. We identified a new extended source within the LHAASO PSF showing a distinct jet and core structure in radio band. The exact nature of the source could not be identified with the present observation. It can be a microquasar and the particles can be accelerated to PeV energies in the microquasar jet.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100381"},"PeriodicalIF":10.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785910","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":"Neutron star analysis under f(R,G,Lm) gravity model","authors":"H. Aman,&nbsp;Z. Yousaf","doi":"10.1016/j.jheap.2025.100380","DOIUrl":"10.1016/j.jheap.2025.100380","url":null,"abstract":"<div><div>The modified Tolman-Oppenheimer-Volkoff (TOV) equations for compact stars in the setting of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>G</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity are derived and numerically solved in this paper, specifically using the functional formulation <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>G</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mi>α</mi><mi>G</mi><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span>. Both quark and hadronic matter, which are characterized by physically accurate equations of state, are taken into consideration while analysing different values of the free parameter <em>α</em>. The influence of <em>α</em> on the properties of these specific stars is examined. The concluding remarks encapsulate the principal discoveries, highlighting their significance and alignment with observational data derived from the neutron star in <span><math><mi>N</mi><mi>G</mi><mi>C</mi><mspace></mspace><mn>6397</mn></math></span>. To account for two different possibilities of the matter Lagrangian density, the study modifies the stellar structure equations by considering <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><mi>p</mi></math></span> (where <em>p</em> denotes the pressure) and <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><mo>−</mo><mi>ρ</mi></math></span> (where <em>ρ</em> represents the density), allowing for accurate and reliable numerical simulations and further analysis. As expected, when <span><math><mi>α</mi><mo>→</mo><mn>0</mn></math></span>, the traditional TOV equations of Einstein's gravity are recovered. The results indicate that the two distinct options, as, <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><mi>p</mi></math></span> and <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>=</mo><mo>−</mo><mi>ρ</mi></math></span>, lead to markedly different outcomes on the mass-radius diagrams. In summary, this research advances our comprehension of the way <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>G</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity affects neutron star interior structures. By providing insightful observations, it lays the groundwork for future studies and investigations in this field.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100380"},"PeriodicalIF":10.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792399","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":"Gamma-ray bursts calibrated from the observational H(z) data in artificial neural network framework","authors":"Zhen Huang ,&nbsp;Zhiguo Xiong ,&nbsp;Xin Luo ,&nbsp;Guangzhen Wang ,&nbsp;Yu Liu ,&nbsp;Nan Liang","doi":"10.1016/j.jheap.2025.100377","DOIUrl":"10.1016/j.jheap.2025.100377","url":null,"abstract":"<div><div>In this paper, we calibrate the luminosity relation of gamma-ray bursts (GRBs) from an Artificial Neural Network (ANN) framework for reconstructing the Hubble parameter <span><math><mi>H</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> from the latest observational Hubble data (OHD) obtained with the cosmic chronometers method in a cosmology-independent way. We consider the physical relationships between the data to introduce the covariance matrix and KL divergence of the data into the loss function and calibrate the Amati relation (<span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>–<span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>iso</mi></mrow></msub></math></span>) by selecting the optimal ANN model with the A219 sample and the J220 sample at low redshift. Combining the Pantheon+ type Ia supernovae (SNe Ia) sample and Baryon acoustic oscillations (BAOs) from Dark Energy Spectroscopy Instrument (DESI) with GRBs at high redshift in the Hubble diagram by Markov Chain Monte Carlo numerical method, we find that the ΛCDM model is preferred over the <em>w</em>CDM and CPL models with joint constraints by the Akaike Information Criterion and Bayesian Information Criterion.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100377"},"PeriodicalIF":10.2,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759001","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":"Matter geometry coupling and Casimir wormhole geometry","authors":"A.S. Agrawal ,&nbsp;Sankarsan Tarai ,&nbsp;B. Mishra ,&nbsp;S.K. Tripathy","doi":"10.1016/j.jheap.2025.100378","DOIUrl":"10.1016/j.jheap.2025.100378","url":null,"abstract":"<div><div>In this study, we investigate traversable wormhole solutions within the setup of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity, a modified theory of gravity where the gravitational action relies upon the matter Lagrangian <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> and the Ricci scalar <em>R</em>. In General Relativity (GR), stability issue in traversable wormholes necessitates the existence of exotic matter violating the null energy condition (NEC). In contrast, we explore wormhole solutions that align with the criteria for Casimir wormholes. Our analysis demonstrates that in the context of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity, exotic matter can sustain these wormholes. We further examine the traversability conditions of the wormhole, considering both scenarios with and without the Generalized Uncertainty Principle (GUP) correction. Additionally, the stability of the wormhole is assessed based on equilibrium conditions. Our findings suggest that <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity offers a viable framework for the existence of stable, traversable wormholes sustained by exotic matter, potentially expanding the landscape of viable wormhole solutions beyond the confines of GR.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100378"},"PeriodicalIF":10.2,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767873","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":"Broadband spectral and emission geometry analysis of XB 1916–053 with Chandra and NuSTAR","authors":"Rahul Sharma","doi":"10.1016/j.jheap.2025.100376","DOIUrl":"10.1016/j.jheap.2025.100376","url":null,"abstract":"<div><div>We report results from a broad-band spectral analysis of the dipping neutron star low-mass X-ray binary XB 1916–053 using the <em>Chandra</em> and <em>Nuclear Spectroscopic Telescope Array (NuSTAR)</em> observation. The spectrum can be well described with a combination of emission from a multi-colour disk (<span><math><mi>k</mi><msub><mrow><mi>T</mi></mrow><mrow><mi>in</mi></mrow></msub><mo>∼</mo></math></span>0.7 keV), a single-temperature blackbody (<span><math><mi>k</mi><msub><mrow><mi>T</mi></mrow><mrow><mi>BB</mi></mrow></msub><mo>∼</mo></math></span>1.4 keV), and thermal Comptonization components (<span><math><mi>Γ</mi><mo>∼</mo><mn>1.9</mn><mo>;</mo><mspace></mspace><mi>k</mi><msub><mrow><mi>T</mi></mrow><mrow><mi>e</mi></mrow></msub><mo>∼</mo></math></span>17 keV), with the neutron star surface (or boundary layer) serving as the primary source of Comptonizing seed photons. The timing and spectral properties suggest that the source is in a soft state, albeit with a relatively high electron corona temperature. Additionally, absorption features were detected in the persistent spectrum from the highly ionized Si, S, Ar, Ca, Fe and a blend of highly ionized Fe K<em>β</em> and Ni K<em>α</em> transitions. These features suggest the presence of a highly ionized atmosphere above the accretion disk during persistent intervals. During the dipping intervals, the line of sight is obscured by the outer disk structure or bulge, which is denser and less ionized.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100376"},"PeriodicalIF":10.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748526","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":"Study of multi-wavelength variability, emission mechanism and quasi-periodic oscillation for transition blazar S5 1803+784","authors":"Javaid Tantry ,&nbsp;Ajay Sharma ,&nbsp;Zahir Shah ,&nbsp;Naseer Iqbal ,&nbsp;Debanjan Bose","doi":"10.1016/j.jheap.2025.100372","DOIUrl":"10.1016/j.jheap.2025.100372","url":null,"abstract":"<div><div>This work present the results of a multi-epoch observational study of the blazar S5 1803+784, carried out from 2019 to 2023. The analysis is based on simultaneous data obtained from the Swift/UVOT/XRT, ASAS-SN, and Fermi-LAT instruments. A historically high <em>γ</em>-ray flux observed for this source on march 2022 (<span><math><mn>2.26</mn><mo>±</mo><mn>0.062</mn><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup><mspace></mspace><mi>phc</mi><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup><msup><mrow><mi>s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. This study investigates the <em>γ</em>-ray emission from a blazar, revealing a dynamic light curve with four distinct flux states: quiescent and high-flux by using the Bayesian Blocks (BB) algorithm. A potential transient quasi-periodic signal with an oscillation timescale of ∼411 days was identified, showing a local significance level surpassing 99.7% from the Lomb-Scargle Periodogram (LSP) and Damped Random Walk (DRW) analysis and exceeds 99.5% from the Weighted Wavelet Z-Transform (WWZ) analysis. The observed QPO was confirmed through an autoregressive process (AR(1)), with a significance level exceeding 99%, suggesting a potential physical mechanism for such oscillations involves a helical motion of a magnetic plasma blob within the relativistic jet. Log parabola modeling of the <em>γ</em>-ray spectrum revealed a photon index (<span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span>) variation of 1.65 ± 0.41 to 2.48 ± 0.09 with a steepening slope, potentially indicative of particle cooling, changes in radiative processes, or modifications in the physical parameters. The <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span> of 2.48 ± 0.09 may hint at an evolutionary transition state from BL Lac to FSRQ. A comparative analysis of variability across different energy bands reveals that Optical/UV and GeV emissions display greater variability compared to X-rays. Broadband SED modeling shows that within a one-zone leptonic framework, the SSC model accurately reproduces flux states without external Compton contributions, highlighting magnetic fields crucial role.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100372"},"PeriodicalIF":10.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785909","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":"Constraining the parameters of heavy dark matter and memory-burdened primordial black holes with DAMPE electron measurements","authors":"Tian-Ci Liu ,&nbsp;Ben-Yang Zhu ,&nbsp;Yun-Feng Liang ,&nbsp;Xiao-Song Hu ,&nbsp;En-Wei Liang","doi":"10.1016/j.jheap.2025.100375","DOIUrl":"10.1016/j.jheap.2025.100375","url":null,"abstract":"<div><div>The DArk Matter Particle Explorer (DAMPE) is a space-based instrument for detecting GeV-TeV cosmic rays and gamma rays. High-energy cosmic rays could be emitted from several dark matter candidates theoretically, such as the heavy dark matter (HDM) and the primordial black holes (PBHs). HDM particles with a mass of <span><math><mo>&gt;</mo><mn>100</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span> could decay into ≳10 TeV electron/positron pairs. PBHs with a mass of <span><math><mo>≲</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>10</mn></mrow></msup><mspace></mspace><mi>g</mi></math></span> would survive to the present day if the Hawking radiation is significantly suppressed due to the memory burden effect and can also lead to the emission of ≳10 TeV electrons. In this work, we use the DAMPE electron measurements to obtain the constraints on the decay lifetime <em>τ</em> of HDM and the entropy index <em>k</em> of memory-burdened PBHs at 95% confidence level. The constraints on the fraction <span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>PBH</mi></mrow></msub></math></span> are also derived with a fixed <em>k</em>. Furthermore, the high-energy tail of the DAMPE electron spectrum shows a sign of going upwards, possibly suggesting the presence of an additional component; we discuss if this spectral behavior is real, which parameter space is required for it to be attributed to HDM or PBH. We will show that the required parameters have been constrained by existing limits.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100375"},"PeriodicalIF":10.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738895","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":"Dark energy and cosmic evolution: A study in f(R,T) gravity","authors":"N. Myrzakulov ,&nbsp;S.H. Shekh ,&nbsp;Anirudh Pradhan ,&nbsp;Archana Dixit","doi":"10.1016/j.jheap.2025.100374","DOIUrl":"10.1016/j.jheap.2025.100374","url":null,"abstract":"<div><div>In the context of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity theory for the flat Friedmann-Lemaitre–Robertson–Walker (FLRW) model, the accelerating expansion of the universe is investigated using a specific form of the emergent Hubble parameter. Datasets from <span><math><mi>H</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span>, Type Ia supernovae (SNIa), and Baryon Acoustic Oscillations (BAO) are used to constrain the model and identify the ideal parameter values in order to evaluate the statistical significance of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity. The best-fit parameters are derived by solving the modified Friedmann equations through a MCMC analysis. These parameters are used to compute the equation of state, statefinders, energy conditions, and the <span><math><mo>(</mo><mi>ω</mi><mo>−</mo><msup><mrow><mi>ω</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>)</mo></math></span> plane. Furthermore, the evolution of kinematic cosmographic parameters is examined. The findings provide significant behavior and features of dark energy models. Our comprehension of the dynamics and evolution of the universe is improved by this study, which also advances our understanding of dark energy and how it shapes the universe. Also, a key outcome of our study is the demonstration that <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity can account for the Hubble tension through an evolving <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, in agreement with recent findings in modified gravity. Our results provide a significant contribution to the ongoing discussion of modified gravity models and their role in explaining cosmic acceleration, offering an alternative perspective to the standard ΛCDM paradigm.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100374"},"PeriodicalIF":10.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748525","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":"Dark Universe inspired by the Kaluza-Klein gravity and impact on primordial gravitational waves","authors":"Kimet Jusufi ,&nbsp;Giuseppe Gaetano Luciano ,&nbsp;Ahmad Sheykhi ,&nbsp;Daris Samart","doi":"10.1016/j.jheap.2025.100373","DOIUrl":"10.1016/j.jheap.2025.100373","url":null,"abstract":"<div><div>We explore the potential implications of Kaluza-Klein (KK) gravity in unifying the dark sector of the Universe. Through dimensional reduction in KK gravity, the 5D spacetime framework can be reformulated in terms of a 4D spacetime metric, along with additional scalar and vector fields. From the 4D perspective, this suggests the existence of a tower of particle states, including KK gravitons with massive spin-0 and spin-1 states, in addition to the massless spin-2 gravitons of general relativity (GR). The key idea in the present paper is the analogy with superconductivity theory. By assuming a minimal coupling between an additional complex scalar field and the gauge field, a “mass” term emerges for the spin-1 gravitons. This, in turn, leads to long-range gravitational effects that could modify Newton's law of gravity through Yukawa-type corrections. Assuming an environment-dependent mass for the spin-1 graviton, near the galactic center the repulsive force from this spin-1 graviton is suppressed by an additional attractive component from Newton's constant corrections, resulting in a Newtonian-like, attraction-dominated effect. In the galaxy's outer regions, the repulsive force fades due to its short range, making dark matter appear only as an effective outcome of the dominant attractive corrections. This approach also explains dark matter's emergence as an apparent effect on cosmological scales while our model is equivalent to the scalar-vector-tensor gravity theory. Finally, we examine the impact of dark matter on the primordial gravitational wave (PGW) spectrum and show that it is sensitive to dark matter effects, providing an opportunity to test this theory through future GW observatories.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"47 ","pages":"Article 100373"},"PeriodicalIF":10.2,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738894","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}