Physics of the Dark Universe最新文献

{"title":"Imprints of magnetic charge on the particle orbits, weak gravitational lensing and black hole shadows","authors":"Farzan Mushtaq ,&nbsp;Xia Tiecheng ,&nbsp;Muhammad Yasir ,&nbsp;Faisal Javed ,&nbsp;Moataz Alosaimi ,&nbsp;Rana Muhammad Zulqarnain","doi":"10.1016/j.dark.2025.102109","DOIUrl":"10.1016/j.dark.2025.102109","url":null,"abstract":"<div><div>We present a comprehensive analysis of a magnetically charged black hole solution featuring its distinctive physical properties and dynamical evolution. By investigating test particle orbits, we derive crucial quantities like the energy, angular momentum, innermost stable circular orbit radius, photon sphere, and Lyapunov exponent. This encompasses research into weak gravitational lensing phenomena in vacuum and plasma medium, focusing on the uniform plasma distribution under SIS and NSIS profiles. Additionally, the amplification of black hole images is studied, with a cross-verification of the deflection angle formula via the Gibbons-Werner method in the optical geometry scheme. A critical feature of our solution is the charge parameter <span><math><mi>q</mi></math></span> and coupling constant <span><math><mi>μ</mi></math></span>, and distinguishes this solution from the classical Schwarzschild black hole. We also study the shadow of a magnetically charged black hole, with an emphasis on the impact of the magnetic charge <span><math><mi>q</mi></math></span> and the coupling constant <span><math><mi>μ</mi></math></span>. Both the shape and the size of the shadow are found to differ significantly from the Schwarzschild case. The higher values of <span><math><mi>q</mi></math></span> and <span><math><mi>μ</mi></math></span> produce larger deviations. Observations of black hole shadows are thus found to provide detectable indications of magnetic charge. Lastly, we study the stability of a newly magnetically charged black hole by analyzing the Lyapunov factor. Our results provide novel geometrical interpretations for the effect of non-trivial electromagnetic and coupling structures on black hole metrics, as well as their consequences for astrophysical observations and the testing of alternative theories of gravity.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102109"},"PeriodicalIF":6.4,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266917","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":"Symbolic regression analysis of dynamical dark energy with DESI-DR2 and SN data","authors":"Agripino Sousa-Neto ,&nbsp;Carlos Bengaly ,&nbsp;Javier E. Gonzalez ,&nbsp;Jailson Alcaniz","doi":"10.1016/j.dark.2025.102108","DOIUrl":"10.1016/j.dark.2025.102108","url":null,"abstract":"<div><div>Recent measurements of Baryon Acoustic Oscillations (BAO) from the Dark Energy Spectroscopic Survey (DESI DR2), combined with data from the cosmic microwave background (CMB) and Type Ia supernovae (SNe), challenge the <span><math><mi>Λ</mi></math></span>-Cold Dark Matter (<span><math><mi>Λ</mi></math></span>CDM) paradigm. They indicate a potential evolution in the dark energy equation of state (EoS), <span><math><mrow><mi>w</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span>, as suggested by analyses that employ parametric models. In this paper, we use a model-independent approach known as high performance symbolic regression (PySR) to reconstruct <span><math><mrow><mi>w</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span> directly from observational data, allowing us to bypass prior assumptions about the underlying cosmological model. Our findings confirm that the DESI DR2 data alone agree with the <span><math><mi>Λ</mi></math></span>CDM model (<span><math><mrow><mi>w</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow><mo>=</mo><mo>−</mo><mn>1</mn></mrow></math></span>) at the redshift range considered. Additionally, when combining DESI data with existing compilations of SN distance measurements, such as Patheon+ and DESY5, we observe no deviation from the <span><math><mi>Λ</mi></math></span>CDM model within <span><math><mrow><mn>3</mn><mi>σ</mi></mrow></math></span> (C.L.) for the interval of values of present-day matter density parameter <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span> and the sound horizon at the drag epoch <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> currently constrained by observational data. Therefore, similarly to the DESI DR1 case, these results suggest that it is still premature to claim statistically significant evidence for a dynamical EoS or deviations from the <span><math><mi>Λ</mi></math></span>CDM model based on the current DESI data in combination with supernova measurements.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102108"},"PeriodicalIF":6.4,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220737","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":"QPO tests and charged particles around regular Ayón-Beato-Garcia black holes","authors":"Bekzod Rahmatov ,&nbsp;Sardor Murodov ,&nbsp;Javlon Rayimbaev ,&nbsp;Sokhibjan Muminov ,&nbsp;Inomjon Ibragimov ,&nbsp;Rashid Eshburiev","doi":"10.1016/j.dark.2025.102102","DOIUrl":"10.1016/j.dark.2025.102102","url":null,"abstract":"<div><div>In this work, we use an Ayón-Beato-Garca (ABG) black hole solution (BH) obtained in GR coupled to nonlinear electrodynamics (NED), which is regular with the electric charge that could be a candidate astrophysical black hole. First, we derive an expression for the scalar electric field potential. Then, we investigate the circular motion of electrically charged particles using the Hamilton–Jacobi formalism, including the effective potential for circular motion, energy, and angular momentum for circular orbits, as well as the innermost circular orbits (ISCOs). Using equations of non-geodesic motion, we derive equations for radial and angular oscillations and apply them to quasi-periodic oscillations (QPOs) around the ABG BHs. We provide Monte-Carlo-Markov-Chain (MCMC) analyses using QPO data observed around three stellar-mass candidates in the microquasars XTE J1550-564, GRO J1655- 40, and GRS 1915+105, and also the data around an intermediate-mass black hole in the ultraluminous galaxy M82 X-1 and supermassive black hole SgrA* in the Milky Way galaxy. The obtained results demonstrate how the ABG black hole solution can describe astrophysical black holes and enhance the theoretical understanding of QPOs near the black hole, providing insights into the underlying physical mechanisms that govern the motion of charged particles.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102102"},"PeriodicalIF":6.4,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220838","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 in the dark sector of the universe after DESI DR2 BAO data","authors":"Marcel van der Westhuizen ,&nbsp;David Figueruelo ,&nbsp;Rethabile Thubisi ,&nbsp;Shambel Sahlu ,&nbsp;Amare Abebe ,&nbsp;Andronikos Paliathanasis","doi":"10.1016/j.dark.2025.102107","DOIUrl":"10.1016/j.dark.2025.102107","url":null,"abstract":"<div><div>We study a non-linear interaction between the dark matter and dark energy components of the universe. Within a spatially flat FLRW geometry, dark matter is described by a dust fluid and dark energy by an ideal gas with a constant equation-of-state parameter, allowing for energy transfer between the two sectors. The resulting effective fluid leads to a unified dynamical dark energy model in which the Hubble function admits an analytic expression. We constrain this model using the DESI DR2 Baryon Acoustic Oscillation (BAO) measurements and the Pantheon+ Type Ia supernovae (SNe Ia) compilation. For the combined dataset, the interacting model provides a better fit than <span><math><mi>Λ</mi></math></span>CDM, with <span><math><mrow><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Interaction</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>−</mo><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>=</mo><mo>−</mo><mn>5</mn></mrow></math></span>. Using the Akaike Information Criterion (AIC), we find <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn></mrow></math></span>, indicating that the interacting model is weakly preferred, though the difference is not statistically significant and disappears when considering BAO data alone. Finally, when comparing the interaction with the <span><math><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></math></span>CDM (CPL) model, we find a small preference for the interaction in the BAO-only case, with <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn><mo>.</mo><mn>5</mn></mrow></math></span>.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102107"},"PeriodicalIF":6.4,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266913","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":"Dynamical Black Hole in the accelerating Universe approaching the future singularity — Possible origin of (super-)massive black holes","authors":"Shin’ichi Nojiri ,&nbsp;Sergei D. Odintsov","doi":"10.1016/j.dark.2025.102104","DOIUrl":"10.1016/j.dark.2025.102104","url":null,"abstract":"<div><div>We construct and investigate the dynamical black hole spacetime embedded in the expanding universe filled with cosmic fluid, such as dark energy. When the equation of state (EoS) parameter of the fluid is a constant, we find exact solutions of the Einstein equation where the Schwarzschild black hole is embedded in the expanding universe. This solution differs from the well-known McVittie metric, where the EoS parameter is not a constant but rather depends on the radial coordinate. It is shown that a dynamical black hole grows with the expansion of the universe. If primordial black holes are created before or during inflation, above dynamical black holes might be the origin of the supermassive black holes at the centre of galaxies, massive black holes suggested by the GW231123 event, and also the dark matter. The case where the cosmic fluid EoS is more general is also considered so that the universe enters the epoch of finite-time future singularity. Thermodynamics and the behaviour of black holes around different future singularities are carefully investigated. It is then demonstrated that the black hole horizon enhances the tidal force, but near the horizon, the tidal force works to press the extended object, which is in contrast with a massive body near to future singularity. We also propose a new type of future singularity where the singularity inside the black hole is a sphere with a finite radius. When the radius of the spherical singularity becomes larger than the radius of the black hole horizon, it becomes naked. The universe may end up with a cosmic doomsday when the radius of the singularity becomes infinite.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102104"},"PeriodicalIF":6.4,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220741","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":"Coleman Weinberg potential and creation of boson particles at the JNW wormhole spacetime","authors":"Hossein Ghaffarnejad","doi":"10.1016/j.dark.2025.102105","DOIUrl":"10.1016/j.dark.2025.102105","url":null,"abstract":"<div><div>This work is dedicated to investigate effects of the Coleman Weinberg self-interaction potential of quantum massless Klein Gordon (KG) scalar fields on perturbation of a minimally coupled Janis–Newman–Winicour (JNW) spherically symmetric static curved spacetime with traversable wormhole topology. In this way, we calculate the corresponding Hawking temperature, rate of particles production, radiation energy density, luminosity, particle absorption factor, mass loss and transmission probability via WKB approximation. This work is extension of the recently published work addressed in the reference section, in which we studied effects of free massive KG quantum waves to find same quantities above for the JNW spacetime with singular naked topology. In fact the JNW spacetime has singular naked with real scalar charge but is traversable wormhole topology with imaginary scalar charge.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102105"},"PeriodicalIF":6.4,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220740","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":"Nonminimal coupling in light of ACT data","authors":"Qing Gao ,&nbsp;Yungui Gong ,&nbsp;Zhu Yi ,&nbsp;Fengge Zhang","doi":"10.1016/j.dark.2025.102106","DOIUrl":"10.1016/j.dark.2025.102106","url":null,"abstract":"<div><div>The latest ACT data release disfavors the attractor <span><math><mrow><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>=</mo><mn>1</mn><mo>−</mo><mn>2</mn><mo>/</mo><mi>N</mi></mrow></math></span>. In inflationary models with nonminimal coupling, such attractors typically arise in the strong coupling limit. To align with observational constraints, we focus on nonminimal coupling models with small coupling constants. For the model with the coupling function <span><math><mrow><mi>Ω</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><mn>1</mn><mo>+</mo><mi>ξ</mi><mi>f</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow></mrow></math></span> and the potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><msup><mrow><mi>λ</mi></mrow><mrow><mn>2</mn></mrow></msup><msup><mrow><mi>f</mi></mrow><mrow><mn>2</mn></mrow></msup><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow></mrow></math></span>, we find that observational data constrain the parameters as <span><math><mrow><mn>0</mn><mo>.</mo><mn>1</mn><mo>≲</mo><mi>ξ</mi><mo>≲</mo><mn>35</mn></mrow></math></span> and <span><math><mrow><mn>0</mn><mo>≲</mo><mi>k</mi><mo>≲</mo><mn>1</mn><mo>.</mo><mn>5</mn></mrow></math></span> for <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><msup><mrow><mi>ϕ</mi></mrow><mrow><mi>k</mi></mrow></msup></mrow></math></span> at the <span><math><mrow><mn>1</mn><mi>σ</mi></mrow></math></span> confidence level. With the help of the nonminimal coupling <span><math><mrow><mi>Ω</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><mn>1</mn><mo>+</mo><mi>ξ</mi><msup><mrow><mi>ϕ</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, the hilltop inflation and power-law inflation models with power indices <span><math><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></math></span> and <span><math><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></math></span> can be consistent with observational data within the <span><math><mrow><mn>1</mn><mi>σ</mi></mrow></math></span> range. We also give the viable parameter regions of <span><math><mi>ξ</mi></math></span> for these three models.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102106"},"PeriodicalIF":6.4,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220739","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":"High energy particle collisions in the vicinity of naked singularity","authors":"Kauntey Acharya ,&nbsp;Parth Bambhaniya ,&nbsp;Pankaj S. Joshi ,&nbsp;Kshitij Pandey ,&nbsp;Vishva Patel","doi":"10.1016/j.dark.2025.102101","DOIUrl":"10.1016/j.dark.2025.102101","url":null,"abstract":"<div><div>In this paper, we investigate particle acceleration and high-energy collisions in the Joshi–Malafarina–Narayan (JMN-1) naked singularity spacetime, which, in the absence of an event horizon, allows infalling particles to turn back under specific angular momentum conditions. These outgoing particles can then collide with infalling particles, enabling the JMN-1 singularity spacetime to act as a natural high-energy particle accelerator. We derive the necessary expressions to compute the center-of-mass energy of two colliding particles and find that this energy can reach extremely high values, potentially even approaching Planck energy scales. If horizonless compact objects exist in nature, these high-energy collisions could substantially influence the surrounding physical processes and might give rise to distinct observational signatures. We also discuss whether phenomena such as a photosphere or shock waves could develop within the shadow region of the JMN-1 naked singularity as a result of high-energy particle collisions near the singularity.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102101"},"PeriodicalIF":6.4,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158472","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":"Probing the Frolov black hole via weak gravitational plasma lensing","authors":"Farzan Mushtaq ,&nbsp;Xia Tiecheng ,&nbsp;Allah Ditta ,&nbsp;Waheed Al-Masry ,&nbsp;Ateyah A. Al-Zahrani ,&nbsp;Shahid M. Ramay ,&nbsp;Asif Mahmood","doi":"10.1016/j.dark.2025.102094","DOIUrl":"10.1016/j.dark.2025.102094","url":null,"abstract":"<div><div>This study investigates the properties of the weak gravitational lensing by using the Gauss–Bonnet theorem in the context of the Frolov black hole. By employing the Gauss–Bonnet theorem, we determine the deflection angle of the black hole for spherically balanced space–time and derive the Gaussian optical curvature. The resulting light deflection angle at the weak field limits demonstrates that light bending is a topological and universal process. Additionally, we determine the light’s deflection angle within the plasma medium’s framework. Furthermore, under the impact of plasma medium and for non-plasma medium, the behaviour of the deflection angle is demonstrated explicitly by the black hole. This research also investigates the related properties of particle dynamics including, effective force and the Lyapunov component. Hence, greater deflection angle depicts the greater photon frequency. Thus, increase in parameters <span><math><mrow><mi>η</mi><mo>,</mo><mspace></mspace><mi>q</mi><mo>,</mo><mspace></mspace><mi>a</mi></mrow></math></span> forecasts decrease in photon frequency and increase in <span><math><mi>α</mi></math></span> and plasma medium <span><math><mi>N</mi></math></span> suggests increase photon frequency. Lyapunov exponent indicates suggests the stability of the black hole solution. In terms of effective force parameters <span><math><mi>η</mi></math></span>, <span><math><mi>q</mi></math></span> and <span><math><mi>a</mi></math></span> suggests weak attraction of the particle whereas parameters <span><math><mi>α</mi></math></span> suggests strong attractions.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102094"},"PeriodicalIF":6.4,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118428","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":"Stable bouncing solutions in teleparallel Horndeski gravity","authors":"Bobomurat Ahmedov ,&nbsp;Maria Caruana ,&nbsp;Konstantinos F. Dialektopoulos ,&nbsp;Jackson Levi Said ,&nbsp;Abdurakhmon Nosirov ,&nbsp;Odil Yunusov ,&nbsp;Zinovia Oikonomopoulou","doi":"10.1016/j.dark.2025.102100","DOIUrl":"10.1016/j.dark.2025.102100","url":null,"abstract":"<div><div>In order to have singularity-free solutions at the beginning of the Universe, we need to violate the null energy condition. In the general class of Horndeski gravity, there are healthy NEC-violating solutions, which however are plagued with instabilities or some kind of pathologies in the history of the Universe; this is known as the no-go theorem. In this paper, we study the possibility of stable bouncing solutions in the Teleparallel analogue of Horndeski gravity and we show explicitly that there exist healthy violations of the no-go theorem.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102100"},"PeriodicalIF":6.4,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158478","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}