Physics of the Dark Universe最新文献

{"title":"Exploring perfect fluid accretion onto quantum-corrected Reissner–Nordstrom black hole","authors":"A. Bukhari ,&nbsp;Ghulam Abbas ,&nbsp;H. Rehman ,&nbsp;Asifa Ashraf ,&nbsp;Assmaa Abd-Elmonem ,&nbsp;Nagat A.A. Suoliman","doi":"10.1016/j.dark.2024.101794","DOIUrl":"10.1016/j.dark.2024.101794","url":null,"abstract":"<div><div>The current study examines astrophysical accretion near a static and spherically symmetric, quantum-corrected charged black hole. Furthermore, the analysis focuses on fluid dynamics in the vicinity of gravitationally quantum-corrected Reissner–Nordstrom Anti-de Sitter black hole for the polytropic and isothermal forms, categorized by their equation of state. We utilized the Hamiltonian dynamical procedure to explore the behavior of the specified fluids. As part of the investigation, the sonic or critical points are identified, revealing key transitions in fluid flow. Also, we have presented the fluid behavior in a closed form through a graphical representation. The results of this research help us to analyze the accretion phenomenon within the effects of quantum gravity.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101794"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Properties of an axisymmetric Lorentzian non-commutative black hole","authors":"A.A. Araújo Filho ,&nbsp;J.R. Nascimento ,&nbsp;A. Yu. Petrov ,&nbsp;P.J. Porfírio ,&nbsp;Ali Övgün","doi":"10.1016/j.dark.2024.101796","DOIUrl":"10.1016/j.dark.2024.101796","url":null,"abstract":"<div><div>In this work, we start by examining a spherically symmetric black hole within the framework of non-commutative geometry and apply a modified Newman–Janis method to obtain a new rotating solution. We then investigate its consequences, focusing on the horizon structure, ergospheres, and the black hole’s angular velocity. Following this, a detailed thermodynamic analysis is performed, covering surface gravity, <em>Hawking</em> temperature, entropy, and heat capacity. We also study geodesic motion, with particular emphasis on null geodesics and their associated radial accelerations. Additionally, the photon sphere and the resulting black hole shadows are explored. Finally, we compute the <em>quasinormal</em> modes for scalar perturbations using the 6th-order WKB approximation.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101796"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Cosmological dynamics and thermodynamic behavior in f(Q,C) gravity: An analytical and observational approach","authors":"Amit Samaddar,&nbsp;S. Surendra Singh","doi":"10.1016/j.dark.2024.101792","DOIUrl":"10.1016/j.dark.2024.101792","url":null,"abstract":"&lt;div&gt;&lt;div&gt;In this study, we investigate a Friedmann–Robertson–Walker (FRW) cosmological model within the context of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; gravity, where &lt;span&gt;&lt;math&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; represents the non-metricity scalar and &lt;span&gt;&lt;math&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; denotes a boundary term. We explore two specific forms of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;: &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;log&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mfrac&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, with &lt;span&gt;&lt;math&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; as free parameters. Utilizing a parametric form of the Hubble parameter, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;z&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mfenced&gt;&lt;mrow&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;z&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;δ&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;δ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;z&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/mfenced&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mfrac&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, we fit the model by employing the MCMC technique to observational data, which includes Hubble, Hubble+BAO and Hubble+Pantheon datasets. Our findings show that the energy density increases over time and the deceleration parameter &lt;span&gt;&lt;math&gt;&lt;mi&gt;q&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; transitions from positive to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, which indicates an accelerated expansion of Universe that is similar to &lt;span&gt;&lt;math&gt;&lt;mi&gt;Λ&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;CDM. The equation of state parameter &lt;span&gt;&lt;math&gt;&lt;mi&gt;ω&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; also approaches to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; that confirms this behavior. We also examine energy conditions and it is observed that our model violates the strong energy condition. Statefinder diagnostics indicate a progression from quintessence to &lt;span&gt;&lt;math&gt;&lt;mi&gt;Λ&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;CDM which is consistent with current observations. Furthermore, thermodynamic analysis demonstrates that entropy density increases with redshift that implies the validation of the second law of thermodynamics. Overall, our &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; model provides a detailed ","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101792"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Traversable Wormholes and their shadows in 4D Einstein–Gauss–Bonnet Gravity: An analytic description","authors":"Madhukrishna Chakraborty ,&nbsp;Subenoy Chakraborty","doi":"10.1016/j.dark.2024.101793","DOIUrl":"10.1016/j.dark.2024.101793","url":null,"abstract":"<div><div>Einstein–Gauss–Bonnet gravity (EGB) in 4D started its journey in 2020, after a regularization on <span><math><mrow><mi>D</mi><mo>→</mo><mn>4</mn></mrow></math></span> limit of EGB gravity considering a rescaled GB coupling constant as <span><math><mfrac><mrow><mi>α</mi></mrow><mrow><mrow><mo>(</mo><mi>D</mi><mo>−</mo><mn>4</mn><mo>)</mo></mrow></mrow></mfrac></math></span> and taking the limit <span><math><mrow><mi>D</mi><mo>→</mo><mn>4</mn></mrow></math></span> by Glavan and Lin. As a result, the regularized 4D gravity theory have non trivial gravitational dynamics. The present work is an attempt to obtain solutions of 4D EGB theory in the background of static spherically symmetric space–time and it has been examined whether they correspond to any possible traversable Wormhole (WH). For matter field, isotropic/ anisotropic fluid and various possible equation of state are considered. Embedding diagrams are analyzed and energy conditions are examined for the WH solutions. Finally, feasible WH shadows have been determined in EGB theory.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101793"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thermal fluctuations and greybody factor of loop quantum black holes","authors":"Faisal Javed ,&nbsp;Sulaman Shaukat ,&nbsp;G. Mustafa ,&nbsp;Allah Ditta ,&nbsp;Bander Almutairi","doi":"10.1016/j.dark.2025.101826","DOIUrl":"10.1016/j.dark.2025.101826","url":null,"abstract":"<div><div>This research investigates the thermal fluctuations and greybody factor of a (3+1)-dimensional black hole within the framework of loop quantum gravity, incorporating higher-order corrections. Our findings indicate that the event horizons are significantly influenced by the loop quantum black hole parameters causing the event horizon to shift outward from the center. We observe the higher-order corrected entropy and respective physical quantities like internal energy, Helmholtz free energy, and Gibbs free energy are evaluated. It reveals that larger black holes tend to have lower values of corrected energies suggesting greater thermodynamic stability. Using the Klein–Gordon equation transformed into a Schrödinger wave equation via tortoise coordinates, we derive the effective potential and analyze its behavior relative to key parameters, including the black hole parameters, and angular momentum. The effective potential exhibits maximum values at smaller horizon radii, decreasing for more massive black holes, highlighting the complex relationship between mass and horizon structure. By solving the radial equation, we can derive two solutions corresponding to the event and cosmic horizons. Using these two solutions in the intermediate regime, we can ascertain the greybody component and its associated behavior. Additionally, raising the quantum parameter also results in a drop in the rate of absorption, demonstrating that the presence of a quantum parameter lowers the absorption rate of Schwarzschild black hole. These intricate dynamics underscore the significant role of loop quantum gravity parameters in shaping black hole thermodynamics and point to potential avenues for future research into their observational implications.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101826"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thermodynamic topology and photon spheres of dirty black holes within non-extensive entropy","authors":"Saeed Noori Gashti ,&nbsp;Behnam Pourhassan ,&nbsp;İzzet Sakallı ,&nbsp;Aram Bahroz Brzo","doi":"10.1016/j.dark.2025.101833","DOIUrl":"10.1016/j.dark.2025.101833","url":null,"abstract":"<div><div>In this paper, we investigate the intricate thermodynamic topology of static dirty black holes within the framework of non-extensive entropy models, including Rényi, Sharma–Mittal, and Barrow statistics. Employing the generalized off-shell Helmholtz free energy method, we rigorously compute the thermodynamic topology of these black holes, deriving their topological classifications for each entropy model. Our analysis reveals that parameters such as the Dilaton parameter <span><math><msup><mrow><mi>η</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>, the non-extensive parameter <span><math><mi>λ</mi></math></span> of Rényi entropy, and the parameters <span><math><mi>α</mi></math></span> and <span><math><mi>β</mi></math></span> of Sharma–Mittal entropy, along with the parameter <span><math><mi>δ</mi></math></span> of Barrow entropy, have a substantial impact on the topological charges of black holes. These findings provide new insights into the topological classifications, underscoring the complex interplay between different entropy models and their influence on black hole thermodynamics. Additionally, when the non-extensive parameter approaches zero, our results reduce to the Bekenstein–Hawking entropy structure, which yields distinct results and introduces new topological classifications, enriching the understanding of black hole thermodynamics. Through detailed analysis and graphical illustrations, we demonstrate the effects of varying these parameters on the topological structure of black holes. Our study offers significant insights into the thermodynamic properties and phase transitions of black holes, advancing our comprehension of their underlying topological nature.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101833"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Neutrino masses from large-scale structures: Future sensitivity and theory dependence","authors":"Davide Racco ,&nbsp;Pierre Zhang ,&nbsp;Henry Zheng","doi":"10.1016/j.dark.2024.101803","DOIUrl":"10.1016/j.dark.2024.101803","url":null,"abstract":"<div><div>In the incoming years, cosmological surveys aim at measuring the sum of neutrino masses <span><math><mrow><mi>Σ</mi><msub><mrow><mi>m</mi></mrow><mrow><mi>ν</mi></mrow></msub></mrow></math></span>, complementing the determination of their mass ordering from laboratory experiments. In order to assess the full potential of large-scale structures (LSS), we employ state-of-the-art predictions from the effective field theory of LSS (EFTofLSS) at one loop to perform Fisher forecasts on the sensitivity (combining power spectrum and bispectrum) of ongoing and future surveys (DESI, MegaMapper) in combination with CMB measurements (Planck, Litebird and Stage-4). We find that the 1<span><math><mi>σ</mi></math></span> sensitivity on <span><math><mrow><mi>Σ</mi><msub><mrow><mi>m</mi></mrow><mrow><mi>ν</mi></mrow></msub></mrow></math></span> is expected to be 15 meV with Planck+DESI, and 7 meV with S4+MegaMapper, where <span><math><mrow><mo>∼</mo><mn>10</mn><mtext>%</mtext></mrow></math></span> and 30% of the constraints are brought by the one-loop bispectrum respectively. To understand how robust are these bounds, we explore how they are relaxed when considering extensions to the standard model, dubbed ‘new physics’. We find that the shift induced on <span><math><mrow><mi>Σ</mi><msub><mrow><mi>m</mi></mrow><mrow><mi>ν</mi></mrow></msub></mrow></math></span> by a <span><math><mrow><mn>1</mn><mi>σ</mi></mrow></math></span> shift on new physics parameters (we consider extra relativistic species, neutrino self-interactions, curvature or a time-evolving electron mass) could be <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mn>10</mn><mo>)</mo></mrow></mrow></math></span> meV for Planck+DESI, but it will be suppressed down to <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span> meV in S4+MegaMapper. Our study highlights the quantitative impact of including the bispectrum at one loop in the EFTofLSS, and the robustness of the sensitivity to <span><math><mrow><mi>Σ</mi><msub><mrow><mi>m</mi></mrow><mrow><mi>ν</mi></mrow></msub></mrow></math></span> against potential new physics thanks to the synergy of cosmological probes.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101803"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Testing the parametric model for self-interacting dark matter using matched halos in cosmological simulations","authors":"Daneng Yang ,&nbsp;Ethan O. Nadler ,&nbsp;Hai-Bo Yu","doi":"10.1016/j.dark.2025.101807","DOIUrl":"10.1016/j.dark.2025.101807","url":null,"abstract":"<div><div>We systemically evaluate the performance of the self-interacting dark matter (SIDM) halo model proposed in Ref.Yang et al. (2023) with matched halos from high-resolution cosmological CDM and SIDM simulations. The model incorporates SIDM effects along mass evolution histories of CDM halos and it is applicable to both isolated halos and subhalos. We focus on the accuracy of the model in predicting halo density profiles at <span><math><mrow><mi>z</mi><mo>=</mo><mn>0</mn></mrow></math></span> and the evolution of maximum circular velocity. We find the model predictions agree with the simulations within <span><math><mrow><mn>10</mn><mtext>%–</mtext><mn>50</mn><mtext>%</mtext></mrow></math></span> for most of the simulated (sub)halos, <span><math><mrow><mn>50</mn><mtext>%–</mtext><mn>100</mn><mtext>%</mtext></mrow></math></span> for extreme cases. This indicates that the model effectively captures the gravothermal evolution of the halos with very strong, velocity-dependent self-interactions. For an example application, we apply the model to study the impact of various SIDM scenarios on strong lensing perturber systems, demonstrating its utility in predicting SIDM effects for small-scale structure analyses. Our findings confirm that the model is an effective tool for mapping CDM halos into their SIDM counterparts.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101807"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thermal aspects, quasi-normal modes and phase transitions of black hole in STV gravity","authors":"R.H. Ali ,&nbsp;M.R. Shahzad ,&nbsp;Asifa Ashraf ,&nbsp;Phongpichit Channuie ,&nbsp;Imed Boukhris ,&nbsp;M.S. Al-Buriahi","doi":"10.1016/j.dark.2024.101773","DOIUrl":"10.1016/j.dark.2024.101773","url":null,"abstract":"<div><div>This work examines the thermodynamic features related to thermal fluctuations and quasi-normal modes in a modified Schwarzschild black hole, coupled with scalar–tensor–vector gravity. Our investigation indicates that the black hole exhibits stability among temperature variations. We commence our investigation by analyzing how these variations affect the essential thermodynamic parameters, such as entropy, internal energy, Helmholtz free energy, Gibbs free energy, enthalpy, specific heat, and the stability of phase transitions, employing the Hessian matrix for this analysis. Furthermore, we explore the dynamics of null geodesics and ascertain the radius of the photon sphere for the modified Schwarzschild black hole within the context of scalar–tensor–vector gravity. We determine the Lyapunov exponent and angular velocity to improve our comprehension of the black hole’s behavior in this altered gravitational structure.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101773"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Primordial black hole clusters, phenomenology & implications","authors":"José Francisco Nuño Siles,&nbsp;Juan García-Bellido","doi":"10.1016/j.dark.2024.101789","DOIUrl":"10.1016/j.dark.2024.101789","url":null,"abstract":"<div><div>We present direct N-body simulations of black-hole-only clusters with up to 2 <em>·</em> 10⁴ compact objects, zero natal spin and no primordial binaries as predicted by various primordial black hole (PBH) Dark Matter models. The clusters’ evolution is com- puted using <span>NBODY6++GPU</span>, including the effects of the tidal field of the galaxy, the kicks of black hole mergers and orbit-averaged energy loss by gravitational radia- tion of binaries. We investigate clusters with four initial mass distributions, three of which attempt to model a generic PBH scenario using a lognormal mass distribu- tion and a fourth one that can be directly linked to a monochromatic PBH scenario when accretion is considered. More specifically, we dive into the clusters’ internal dy- namics, describing their expansion and evaporation, along with the resultant binary black hole mergers. We also compare several simulations with and without black hole merger kicks and find modelling implications for the probability of hierarchical mergers.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101789"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}