Physics of the Dark Universe最新文献

{"title":"Dynamics of the universe in f(G,τ2) gravity via well-known cosmological bouncing","authors":"Shamaila Rani ,&nbsp;Nadeem Azhar ,&nbsp;Amna Mir ,&nbsp;Abdul Jawad ,&nbsp;Yousef Mohammed Alanazi ,&nbsp;Abdulrahman Bin Jumah ,&nbsp;Hafiz Haseeb Nawaz","doi":"10.1016/j.dark.2025.101832","DOIUrl":"10.1016/j.dark.2025.101832","url":null,"abstract":"<div><div>In this manuscript, we consider the newly proposed modified theory in which topological invariant Gauss–Bonnet <span><math><mi>G</mi></math></span> is coupled with the energy–momentum squared <span><math><mrow><mo>(</mo><msup><mrow><mi>τ</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><msub><mrow><mi>τ</mi></mrow><mrow><mi>μ</mi><mi>ν</mi></mrow></msub><msup><mrow><mi>τ</mi></mrow><mrow><mi>μ</mi><mi>ν</mi></mrow></msup><mo>)</mo></mrow></math></span>. For this matter-geometric coupling, we consider <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>G</mi><mo>,</mo><msup><mrow><mi>τ</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></mrow><mo>=</mo><mi>f</mi><mrow><mo>(</mo><mi>G</mi><mo>)</mo></mrow><mo>+</mo><mi>g</mi><mrow><mo>(</mo><msup><mrow><mi>τ</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></mrow></mrow></math></span> model for flat FriedmannRobertsonWalker (FRW) universe. The dynamics of bouncing cosmology are thoroughly examined within the framework of underlying viable model which can overcome the singularity’s challenge in standard Big-Bang cosmology. We study a power law scale factor and some cosmological bouncing scale factors such as symmetric, super, oscillatory and matter. These cosmological bouncing scale factors are essential for exploring the universe’s origins while bypassing the concept of an initial singularity, thus presenting alternative approaches that address the limitations of the Big Bang model. In this scenario, we determine the equation of state parameter, <span><math><mi>ω</mi></math></span>, along with the squared sound speed parameter. Additionally, we investigate the behavior of the <span><math><mrow><mi>ω</mi><mo>−</mo><msup><mrow><mi>ω</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></math></span> plane for underlying framework. Interestingly, it should be noted that every outcome favors recent observational data.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101832"},"PeriodicalIF":5.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145291","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":"Plasma lensing, epicyclic oscillations, particle collision, and thermal fluctuations around a short-hairy black hole","authors":"Asifa Ashraf ,&nbsp;Allah Ditta ,&nbsp;Abdelmalek Bouzenada ,&nbsp;S.K. Maurya ,&nbsp;Assmaa Abd-Elmonem ,&nbsp;Nagat A.A. Suoliman ,&nbsp;Phongpichit Channuie","doi":"10.1016/j.dark.2025.101836","DOIUrl":"10.1016/j.dark.2025.101836","url":null,"abstract":"<div><div>We explore the behavior of test particles in the vicinity of a spherically symmetric black hole with short-hair characteristics, emphasizing the impact of the model’s parameters on various phenomena such as particle trajectories, plasma-induced gravitational lensing, epicyclic oscillations, and thermal variations. The black hole is defined by three key parameters: mass <span><math><mi>M</mi></math></span>, the short-hairy parameter <span><math><mi>Q</mi></math></span>, and an additional parameter <span><math><mi>α</mi></math></span>. We derive analytical formulas for the energy and angular momentum of test particles, expressed in terms of these black hole parameters. Additionally, we investigate the effective potential, the innermost stable circular orbits, and the forces influencing particle motion. The study also delves into the epicyclic oscillations of particles close to the equatorial plane, providing analytical expressions for radial, vertical, and orbital frequencies, along with the periastron precession frequency. In the context of weak gravitational lensing with plasma, we observe that the parameter <span><math><mi>α</mi></math></span> does not affect the deflection angle, whereas the other parameters play a significant role. Moreover, we analyze thermal fluctuations in these short-hairy black holes, which are linked to the Hawking temperature and entropy. Our findings underscore the profound influence of the black hole’s parameters on particle dynamics, revealing fascinating aspects of their behavior.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101836"},"PeriodicalIF":5.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143312477","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":"Possible existence of traversable wormholes within stellar galactic halos in modified f(R) gravity: A class 1 embedding approach","authors":"Hammad Nazar ,&nbsp;Ghulam Abbas ,&nbsp;M.R. Shahzad ,&nbsp;Asifa Ashraf ,&nbsp;Imed Boukhris ,&nbsp;Abdulaziz Abdullah Alanazi ,&nbsp;Farruh Atamurotov","doi":"10.1016/j.dark.2025.101837","DOIUrl":"10.1016/j.dark.2025.101837","url":null,"abstract":"<div><div>The present manuscript explores the novel implications of the potential existence of static, anisotropic, and spherically symmetric wormhole spheres within the dark-matter halos of elliptical galaxies in the framework of modified <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity theory. To achieve this objective, we first derived the spacetime solution employing the Tolman-V ansatz as the solution for the gravitational redshift function. In addition to this, we applied the well-known Class 1 Karmarkar condition to determine the wormhole shape function as another metric potential. Subsequently, these solutions were combined with a dark-matter galactic density profile resembling the de Vaucouleur’s model to derive the matter components of the modified field equations. We focus on three popular and cosmologically viable <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity models: <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow><mo>=</mo><mi>R</mi><mo>+</mo><mi>β</mi><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow><mo>=</mo><msup><mrow><mi>e</mi></mrow><mrow><mi>β</mi><mi>R</mi></mrow></msup></mrow></math></span>, and <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow><mo>=</mo><mi>R</mi><mo>+</mo><mi>β</mi><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup><mrow><mo>(</mo><mrow><mn>1</mn><mo>+</mo><mi>α</mi><mo>ln</mo><mfenced><mrow><mfrac><mrow><mi>R</mi></mrow><mrow><msup><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></mfrac></mrow></mfenced></mrow><mo>)</mo></mrow></mrow></math></span>. To validate the physical acceptability of our wormhole space–time solutions, we performed a graphical analysis for these <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity models. This analysis examined various constraints, such as the viability of energy conditions, stability via pressure anisotropy and the modified TOV equation, consistency through the volume integral quantifier, and credibility via total gravitational energy. In particular, for minimal values of the free parameter <span><math><mi>γ</mi></math></span> and fixed values of other constants, we observed a small amount of exotic matter near the throat of the wormhole, evidenced by limited violations of the energy conditions. This suggests that the modified gravity framework serves as a promising alternative to support wormhole structures with negligible exotic matter. In conclusion, our proposed solutions satisfy the essential requirements for configuring wormhole structures within the dark-matter halo regions of elliptical galaxies, providing new insights into the potential interplay between modified gravity and galactic dark-matter distributions.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101837"},"PeriodicalIF":5.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144770","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":"Investigating the effects of particle motion and gravitational lensing of black hole in string-inspired Euler–Heisenberg theory","authors":"Muhammad Yasir ,&nbsp;Farzan Mushtaq ,&nbsp;Xia Tiecheng ,&nbsp;Faisal Javed","doi":"10.1016/j.dark.2025.101838","DOIUrl":"10.1016/j.dark.2025.101838","url":null,"abstract":"<div><div>This paper is motivated by a study that discovered the properties of black holes with string-inspired Euler–Heisenberg theory in terms of particle dynamics and weak gravitational plasma lensing. We analyze particle dynamics using the effective potential and innermost stable circular orbits for massive particle and photon motion. This study examines the interaction of test particles with a black hole under various physical parameters, focusing on the behavior of the innermost stable circular orbit radius. Notably, we discover that particles with radii less than the innermost stable circular orbit converge towards the black hole singularity, whereas those beyond the innermost stable circular orbit advance towards infinity, demonstrating the dynamic influence of the black hole parameters on particle trajectories. To examine gravitational lensed photons, we consider a weak gravitational field. This objective of lensing is served by considering three plasma fields: uniform plasma, singular isothermal sphere, and non-singular isothermal sphere. We also investigate the deflection angles for non-plasma and plasma mediums. The bending angle under weak field limitations is calculated using optical geometry and the Gibbons–Werner technique. We found that the influence of these mediums enhances the black hole’s bending angle. We analyze the deflection angle of light based on the impact parameter and its graphical impact on the angle for both cases.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101838"},"PeriodicalIF":5.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145293","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":"Gravitational wave from extreme mass-ratio inspirals around a Kerr–Taub–NUT black hole","authors":"Tieguang Zi ,&nbsp;Changqing Ye","doi":"10.1016/j.dark.2025.101809","DOIUrl":"10.1016/j.dark.2025.101809","url":null,"abstract":"<div><div>We have computed the gravitational waves emitted from extreme mass-ratio inspirals (EMRIs) around the Kerr–Taub–NUT black hole using a hybrid method. Firstly, we derive the analytic expressions of the orbital energy, angular momentum and Carter constant for the generic geodesic orbits, and compute the orbital frequencies numerically. To evolve the orbital parameters adiabatically, we adopt the hybrid fluxes based on the radial motion period in the Kerr–Taub–NUT black hole and the Kerr fluxes in the numerical kludge model. Using the inspiraling trajectories, we compute EMRI waveform to assess the difference of waveforms from the Kerr and Kerr–Taub–NUT BHs. We find that, LISA can distinguish the EMRIs waveform from the Kerr–Taub–NUT black hole with a NUT charge as smaller as <span><math><mrow><msub><mrow><mi>N</mi></mrow><mrow><mtext>min</mtext></mrow></msub><mo>∼</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow></math></span>. After one year observation of EMRI signal, the constraint on NUT charge by LISA can be measured within an error of <span><math><mrow><mi>Δ</mi><mi>N</mi><mo>∼</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow></math></span>, which is correlated with the measurement errors of the other intrinsic parameters.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101809"},"PeriodicalIF":5.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144772","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":"Chiral geodesics in a stationary electromagnetic universe","authors":"M. Halilsoy,&nbsp;V. Memari","doi":"10.1016/j.dark.2025.101834","DOIUrl":"10.1016/j.dark.2025.101834","url":null,"abstract":"<div><div>The spinning electromagnetic universe, known also as the Rotating Bertotti–Robinson(RBR) spacetime is considered in which attractive electromagnetic energy races with centrifugal force. The model derives from different physical considerations, such as colliding waves, throat region, and near horizon geometry of the Kerr–Newman black hole. Stated otherwise, although our spacetime is not a black hole (BH) spacetime it is connected to a BH indirectly. Our interest is whether such a singularity-free spinning cosmology consisting of electromagnetic fields alone gives rise to a natural direction of flow, a ‘chirality’ for charged particles. The vast majority of our cosmos consists of vacuum filled by the cosmic microwave background (CMB) and our RBR may be considered as a representative model for such electrovacua. It is observed that the magnetic field in evolutionary cosmology is crucial. We also show the occurrence of closed timelike curves a ‘la’ Gödel. Such curves, however, seem possible only at localized cell structures, not at large scales, but according to our prescription of near horizon geometry, they arise in the vicinity i.e. near horizon of a charged, spinning black hole.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101834"},"PeriodicalIF":5.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144771","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":"Cosmography of f(R,L,T) gravity","authors":"Sai Swagat Mishra ,&nbsp;J.A.S. Fortunato ,&nbsp;P.H.R.S. Moraes ,&nbsp;P.K. Sahoo","doi":"10.1016/j.dark.2025.101831","DOIUrl":"10.1016/j.dark.2025.101831","url":null,"abstract":"<div><div>In order to explain the accelerated phase of the universe expansion, several alternatives to the standard model have been proposed, such as dark energy models and alternative theories of gravity. Although these approaches rest on different physical aspects, it has been shown that both can be in agreement with data in the current status of cosmological observations, which leads to an enormous degeneration. Therefore, until evidence of higher experimental accuracy is available, more conservative model-independent approaches are useful for breaking this degenerated cosmological models picture. Cosmography as a kinematic study of the Universe is the most popular candidate in this regard. In the present work we develop, as a novelty in the literature, cosmography of the recently proposed <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>L</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> gravity, for which <span><math><mi>f</mi></math></span> is a generic function of the Ricci scalar <span><math><mi>R</mi></math></span>, the matter Lagrangian density <span><math><mi>L</mi></math></span> and the trace of the energy–momentum tensor <span><math><mi>T</mi></math></span>. We analyze two different cases for the functional form of the <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>L</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> function. We find the cosmographic parameters for each model and observationally constrain them using cosmic chronometers, baryon acoustic oscillations and gamma-ray bursts. Remarkably, our analysis demonstrates that <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>,</mo><mi>L</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> gravity can accommodate the observed cosmic acceleration.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101831"},"PeriodicalIF":5.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145294","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":"Constraining f(Q,Lm) gravity with bulk viscosity","authors":"Y. Myrzakulov ,&nbsp;O. Donmez ,&nbsp;M. Koussour ,&nbsp;S. Muminov ,&nbsp;I.Y. Davletov ,&nbsp;J. Rayimbaev","doi":"10.1016/j.dark.2025.101829","DOIUrl":"10.1016/j.dark.2025.101829","url":null,"abstract":"<div><div>We investigate the influence of bulk viscosity on late-time cosmic acceleration within an extended <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></mrow></mrow></math></span> gravity framework, where the non-metricity <span><math><mi>Q</mi></math></span> is non-minimally coupled with the matter Lagrangian <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span>. Analyzing the function <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></mrow><mo>=</mo><mi>α</mi><mi>Q</mi><mo>+</mo><mi>β</mi><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub></mrow></math></span>, we derive exact solutions under non-relativistic matter domination. Using observational datasets (<span><math><mrow><mi>H</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span>, Pantheon supernovae, and their combination), we constrain the model parameters <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, <span><math><mi>α</mi></math></span>, <span><math><mi>β</mi></math></span>, and <span><math><mi>ζ</mi></math></span>. The deceleration parameter transitions from positive to negative values around redshifts <span><math><mrow><msub><mrow><mi>z</mi></mrow><mrow><mi>t</mi></mrow></msub><mo>≈</mo><mn>0</mn><mo>.</mo><mn>80</mn></mrow></math></span> to 0.99, indicating current accelerated expansion. Moreover, the effective equation of state parameter, <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></math></span>, resembles quintessence dark energy (<span><math><mrow><mo>−</mo><mn>1</mn><mo>&lt;</mo><msub><mrow><mi>ω</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub><mo>&lt;</mo><mo>−</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>3</mn></mrow></mfrac></mrow></math></span>), with corresponding values from respective datasets. Finally, we use the <span><math><mrow><mi>O</mi><mi>m</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span> diagnostic, which confirms that our model demonstrates quintessence-like behavior. Our findings underscore the significant role of bulk viscosity in understanding accelerated expansion in the universe within alternative gravity theories.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101829"},"PeriodicalIF":5.0,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145292","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":"Editorial - Proceedings of Cosmology and Astrophysics in the Gravitational Wave Astronomy Era","authors":"Vasilis Oikonomou","doi":"10.1016/j.dark.2024.101554","DOIUrl":"10.1016/j.dark.2024.101554","url":null,"abstract":"","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"46 ","pages":"Article 101554"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141401836","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":"Compartmentalization and coexistence in the dark sector of the universe","authors":"Andronikos Paliathanasis ,&nbsp;Kevin Duffy ,&nbsp;Amlan Halder ,&nbsp;Amare Abebe","doi":"10.1016/j.dark.2024.101750","DOIUrl":"10.1016/j.dark.2024.101750","url":null,"abstract":"<div><div>We revise the cosmological interaction between dark energy and dark matter. More precisely, we focus on models that support compartmentalization or coexistence in the dark sector of the universe. Within the framework of a homogeneous and isotropic, spatially flat Friedmann–Lemaître–Robertson–Walker geometry, we analyse the asymptotic behaviour of the physical parameters for two interacting models, where dark energy and dark matter have constant equations of state parameters, in the presence of dark radiation, when dark energy is described by a quintessence scalar field. For each model, we determine the asymptotic solutions and attempt to understand how the interaction affects the cosmological evolution and history.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101750"},"PeriodicalIF":5.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756934","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}