Physics of the Dark Universe最新文献_第6页

Effect of primary scalar hair on black hole’s strong lensing in Beyond Horndeski gravity 原生标量毛对超霍恩德斯基引力中黑洞强透镜效应的影响

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-31 DOI: 10.1016/j.dark.2025.102069

Mohsen Fathi

{"title":"Effect of primary scalar hair on black hole’s strong lensing in Beyond Horndeski gravity","authors":"Mohsen Fathi","doi":"10.1016/j.dark.2025.102069","DOIUrl":"10.1016/j.dark.2025.102069","url":null,"abstract":"<div><div>We study the gravitational lensing effects of a static, asymptotically flat black hole with primary scalar hair in Beyond Horndeski gravity, focusing on the strong lensing regime. Recently, in Ref. Erices and Fathi (2025), we placed constraints on the scalar hair parameter by analyzing its thermodynamic stability and the black hole shadow. In this work, we further investigate the strong lensing properties of the black hole, which form the basis of shadow formation, and employ observational data from the Event Horizon Telescope to derive more precise constraints on the scalar hair parameter. Additionally, we compute the shape and position of different lensed images of a thin accretion disk and argue that the observed black hole shadow corresponds to the secondary image of the emitting disk. Using this interpretation, we perform a new set of constraints on the scalar hair. Furthermore, we discuss why higher-order images are not suitable for astrophysical constraints, highlighting the limitations posed by their faintness and observational challenges. Finally, we find that models satisfying these constraints exhibit local instabilities.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102069"},"PeriodicalIF":6.4,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989289","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}

引用次数: 0

An innovative black hole solution and thermodynamic properties in higher-order curvature gravity with a scalar field 一个具有标量场的高阶曲率引力的黑洞解和热力学性质的创新

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-31 DOI: 10.1016/j.dark.2025.102061

G.G.L. Nashed , Usman Zafar , Kazuharu Bamba

引用次数: 0

The influence of cosmological constant on light deflection in rotating spacetimes via the generalized Gibbons–Werner method 用广义Gibbons-Werner方法研究宇宙常数对旋转时空中光偏转的影响

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-31 DOI: 10.1016/j.dark.2025.102070

Yang Huang, Xiangyun Fu, Zhenyan Lu, Xin Qin

{"title":"The influence of cosmological constant on light deflection in rotating spacetimes via the generalized Gibbons–Werner method","authors":"Yang Huang, Xiangyun Fu, Zhenyan Lu, Xin Qin","doi":"10.1016/j.dark.2025.102070","DOIUrl":"10.1016/j.dark.2025.102070","url":null,"abstract":"<div><div>Recently, we proposed a generalized Gibbons–Werner (GW) method for analyzing particle trajectories in rotating spacetimes, regardless of their asymptotic behavior (Huang et al., 2024). Using this method, we examine the impact of the cosmological constant (<span><math><mi>Λ</mi></math></span>) on the light deflection in rotating spacetimes within the framework of Kerr–de Sitter (KdS) geometry. Although Sultana previously calculated the deflection angle of light in KdS spacetime, our study advances this research in three aspects: (i) Orbit solution—the light trajectory is derived by directly solving the original equation of motion (EOM) without intermediate processes. (ii) Positions of the source and observer—the finite distances of the source and observer from the lens are explicitly considered, avoiding approximations. (iii) Staticity of the source and observer—the Randers optical space is employed to resolve the staticity constraint. Through these refined considerations, we obtain a novel expression for the deflection angle of light in KdS spacetime, accurate to second-order in <span><math><mi>Λ</mi></math></span>, as well as in the mass (M) and spin parameter (a) of the central body. Furthermore, we discuss the discrepancies between our results and previous expressions. Finally, we evaluate the observational implications of our corrections relative to Sultana’s work in the lensing systems of the Sun and Sgr A*, and show that they may become observable with forthcoming high-precision astronomical measurements.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102070"},"PeriodicalIF":6.4,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050097","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}

引用次数: 0

Exploring non-cold dark matter in the scenario of dynamical dark energy with DESI DR2 data 利用DESI DR2数据探索动态暗能量场景下的非冷暗物质

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-29 DOI: 10.1016/j.dark.2025.102068

Tian-Nuo Li , Peng-Ju Wu , Guo-Hong Du , Yan-Hong Yao , Jing-Fei Zhang , Xin Zhang

{"title":"Exploring non-cold dark matter in the scenario of dynamical dark energy with DESI DR2 data","authors":"Tian-Nuo Li , Peng-Ju Wu , Guo-Hong Du , Yan-Hong Yao , Jing-Fei Zhang , Xin Zhang","doi":"10.1016/j.dark.2025.102068","DOIUrl":"10.1016/j.dark.2025.102068","url":null,"abstract":"<div><div>Recent observations of DESI hint that dark matter (DM) may not be cold but have a non-zero equation of state (EoS) parameter, and that dark energy (DE) may not be the cosmological constant. In this work, we explore the possibility of a non-zero DM EoS parameter within the framework of dynamical DE. We perform analysis by using the latest baryon acoustic oscillation (BAO) data from DESI DR2, the cosmic microwave background (CMB) data from Planck, and the type Ia supernova (SN) data from PantheonPlus and DESY5. When using the combination of CMB, BAO, and SN data, our results indicate a preference for a non-zero DM EoS parameter at the <span><math><mrow><mn>2</mn><mo>.</mo><mn>8</mn><mi>σ</mi></mrow></math></span> and <span><math><mrow><mn>3</mn><mo>.</mo><mn>3</mn><mi>σ</mi></mrow></math></span> level within the content of a constant DE EoS. In contrast, for a time-evolving DE EoS parameterized by <span><math><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span>, this preference decreases to <span><math><mrow><mn>0</mn><mo>.</mo><mn>8</mn><mi>σ</mi></mrow></math></span> and <span><math><mrow><mn>1</mn><mo>.</mo><mn>1</mn><mi>σ</mi></mrow></math></span>. Furthermore, allowing a non-zero DM EoS yields best-fit values of <span><math><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span> that exhibit smaller deviations from the <span><math><mi>Λ</mi></math></span>CDM expectations, and Bayesian evidence analysis shows a comparable preference for this model relative to <span><math><mi>Λ</mi></math></span>CDM. The overall results of this work indicate that a non-zero DM EoS parameter warrants further exploration and investigation.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102068"},"PeriodicalIF":6.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920235","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}

引用次数: 0

Quantum-corrected thermodynamics and plasma lensing in non-minimally coupled symmetric teleparallel black holes 非最小耦合对称远平行黑洞中的量子修正热力学和等离子体透镜

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-27 DOI: 10.1016/j.dark.2025.102063

Erdem Sucu , İzzet Sakallı , Özcan Sert , Yusuf Sucu

{"title":"Quantum-corrected thermodynamics and plasma lensing in non-minimally coupled symmetric teleparallel black holes","authors":"Erdem Sucu , İzzet Sakallı , Özcan Sert , Yusuf Sucu","doi":"10.1016/j.dark.2025.102063","DOIUrl":"10.1016/j.dark.2025.102063","url":null,"abstract":"<div><div>We investigate the thermodynamic and optical signatures of electrically charged black holes (BHs) in symmetric teleparallel gravity (STPG) with non-minimal electromagnetic coupling, incorporating quantum corrections and plasma dispersion effects. The BH solution, characterized by a coupling parameter <span><math><mi>k</mi></math></span>, generalizes the Reissner–Nordström spacetime through power-law modifications to electromagnetic terms in the metric function. We implement exponential corrections to the Bekenstein–Hawking entropy of the form <span><math><mrow><mi>S</mi><mo>=</mo><msub><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>+</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo><msub><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></msup></mrow></math></span> and derive quantum-corrected expressions for fundamental thermodynamic quantities including internal energy, Helmholtz and Gibbs free energies, pressure, enthalpy, and heat capacity. Our analysis reveals rich phase transition structures with second-order transitions occurring at critical horizon radii for specific coupling values, demonstrating enhanced thermodynamic instability under strong non-minimal coupling effects. The quantum-corrected Joule–Thomson expansion analysis identifies distinct cooling and heating regimes separated by inversion points that shift systematically with the coupling parameter <span><math><mi>k</mi></math></span>. We analyze the efficiency of heat engines operating in Carnot cycles, finding that electromagnetic charge enhances thermodynamic performance with efficiency values approaching 99% for optimal configurations in this geometry. Using the Gauss–Bonnet theorem, we derive analytical expressions for gravitational deflection angles in both vacuum and plasma environments, revealing how non-minimal coupling and plasma dispersion create frequency-dependent lensing signatures that differ substantially from general relativity predictions.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102063"},"PeriodicalIF":6.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144912936","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}

引用次数: 0

Energy extraction and evolution of regular black holes: The case of Bardeen spacetime 规则黑洞的能量提取与演化：以巴丁时空为例

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-27 DOI: 10.1016/j.dark.2025.102066

Vitalii Vertogradov , Angel Rincon

引用次数: 0

The effect of the gravitational constant variation on the phase of gravitational waves 重力常数变化对引力波相位的影响

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-27 DOI: 10.1016/j.dark.2025.102062

Jiachen An , Bing Sun , Zhoujian Cao

{"title":"The effect of the gravitational constant variation on the phase of gravitational waves","authors":"Jiachen An , Bing Sun , Zhoujian Cao","doi":"10.1016/j.dark.2025.102062","DOIUrl":"10.1016/j.dark.2025.102062","url":null,"abstract":"<div><div>We have previously investigated the effect of the gravitational constant variation on the gravitational wave propagation. Pure theoretical analysis indicates that the leading order effect of the gravitational constant variation corrects the amplitude of gravitational waves, and the second order effect corrects the phase of gravitational waves. As the matched filtering technique is used by gravitational wave data analysis, the phase is more important than the amplitude. In the current paper we use LIGO-VIRGO-KAGRA data to constrain the gravitational constant variation. Our findings indicate that we need to wait until the distance of the detected gravitational wave events and/or the signal-to-noise ratio increases by <span><math><mrow><mn>2</mn><mi>n</mi></mrow></math></span> orders compared to the current detection state, and then we can use phase correction to get constraint <span><math><mrow><mrow><mo>|</mo><mfrac><mrow><msup><mrow><mi>G</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mrow><mi>G</mi></mrow></mfrac><mo>|</mo></mrow><mo><</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mi>n</mi></mrow></msup></mrow></math></span>/yr for gravitational wave events without electromagnetic counterparts. For gravitational wave events with electromagnetic counterparts which provide the information of source’s luminosity distance, the phase correction can almost always be neglected to constrain <span><math><mfrac><mrow><msup><mrow><mi>G</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mrow><mi>G</mi></mrow></mfrac></math></span>.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102062"},"PeriodicalIF":6.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926563","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}

引用次数: 0

Testing energy conditions and light deflection in f(Q) wormholes induced by Dekel–Zhao dark matter profile Dekel-Zhao暗物质剖面诱导f(Q)虫洞的能量条件和光偏转测试

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-26 DOI: 10.1016/j.dark.2025.102059

Nayan Sarkar , Susmita Sarkar , Abdelmalek Bouzenada

{"title":"Testing energy conditions and light deflection in f(Q) wormholes induced by Dekel–Zhao dark matter profile","authors":"Nayan Sarkar , Susmita Sarkar , Abdelmalek Bouzenada","doi":"10.1016/j.dark.2025.102059","DOIUrl":"10.1016/j.dark.2025.102059","url":null,"abstract":"<div><div>This study tested the potential formation of traversable wormholes induced by dark matter within the framework of modified symmetric teleparallel gravity. To obtain viable wormhole solutions, we tested and illustrated the Dekel-Zhao (DZ) dark matter profile associated with anisotropic matter sources. The obtained shape function satisfies all the necessary geometric criteria for representing traversable wormhole structures under a specific set of parameters. Also, a detailed analysis of the energy conditions is performed, showing both the regions of validity and violation depending on the chosen modified symmetric teleparallel gravity parameters, thereby shedding light on the nature of the matter supporting these wormholes. In this case, we show and test several physical features of the wormhole solutions, including the tidal forces, embedding surface, complexity factor, and total gravitational energy. In addition, we analyzed the strong gravitational lensing phenomenon associated with these wormholes, finding that the deflection angle decreases towards large distances where gravitational effects weaken, while it diverges near the throat due to the intense gravitational field.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102059"},"PeriodicalIF":6.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922331","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}

引用次数: 0

Field sources for f(R,Rμν) black-bounce solutions: The case of K-gravity f（R,Rμν）黑弹跳解的场源：k-重力的情况

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-23 DOI: 10.1016/j.dark.2025.102060

G. Alencar , M. Nilton , Manuel E. Rodrigues , Marcos V. de S. Silva

{"title":"Field sources for f(R,Rμν) black-bounce solutions: The case of K-gravity","authors":"G. Alencar , M. Nilton , Manuel E. Rodrigues , Marcos V. de S. Silva","doi":"10.1016/j.dark.2025.102060","DOIUrl":"10.1016/j.dark.2025.102060","url":null,"abstract":"<div><div>In the framework of Simpson-Visser, the search for field sources that produce black-bounces in alternative gravity theories has remained unresolved. In this paper, the first in a series exploring sources for alternative theories of gravity, we identify such a source for the <span><math><mrow><mn>2</mn><mo>+</mo><mn>1</mn></mrow></math></span> dimensional K-gravity black-bounce. The K-gravity black hole is notable for allowing asymptotically locally flat solutions in lower-dimensional spacetime, yet it possesses curvature singularities concealed within the event horizon. Using the Simpson-Visser regularization technique, we eliminate this singularity, constructing asymptotically locally flat black-bounce solutions in <span><math><mrow><mn>2</mn><mo>+</mo><mn>1</mn></mrow></math></span> dimensions. We explore the causal structure of these solutions, identifying the conditions under which they describe regular black holes or wormholes. By calculating curvature invariants, we confirm the absence of singularities within the event horizon. Additionally, we demonstrate that, beyond non-linear electrodynamics, a non-linear scalar field is required to source the solution. Finally, we investigate the geodesic structure of this spacetime, analyzing the trajectories of both massive and massless particles. We also confirm the existence of circular orbits and assess their stability.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"49 ","pages":"Article 102060"},"PeriodicalIF":6.4,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892770","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}

引用次数: 0

Observationally favorable consequences of cosmographic parameters and thermodynamics of dark energy model in non-zero torsion gravity 非零扭转重力下暗能量模型的宇宙学参数和热力学的有利观测结果

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2025-08-23 DOI: 10.1016/j.dark.2025.102056

Nadeem Azhar , Sidra Karim , Abdul Jawad , Mohammad Mahtab Alam , Muhammad Sajjad Farid , Sanjar Shaymatov

{"title":"Observationally favorable consequences of cosmographic parameters and thermodynamics of dark energy model in non-zero torsion gravity","authors":"Nadeem Azhar , Sidra Karim , Abdul Jawad , Mohammad Mahtab Alam , Muhammad Sajjad Farid , Sanjar Shaymatov","doi":"10.1016/j.dark.2025.102056","DOIUrl":"10.1016/j.dark.2025.102056","url":null,"abstract":"<div><div>In this manuscript, we explore the dynamics of the universe via cosmographic parameters by assuming the holographic dark energy in Non-zero torsion gravity which provides a robust geometric foundation that naturally integrates quantum spin effects into gravitational theory, offering deeper insights into spacetime dynamics. The cosmographic parameters under investigation include the deceleration parameter, which quantifies the rate at which cosmic expansion slows down, the jerk parameter, which provides insight into the dynamics of cosmic acceleration and the lerk and snap parameters, which characterize higher-order variations in the universe’s expansion behavior. Additionally, we examine the equation of state parameter to gain a broader perspective on cosmic evolution influenced by torsional effects. We also verify the validity of the generalized second law of thermodynamics and the thermal condition by considering generalized entropy as horizon entropy. Notably, our analysis confirms that both conditions hold, reinforcing the consistency of the model.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"49 ","pages":"Article 102056"},"PeriodicalIF":6.4,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902858","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}

引用次数: 0