{"title":"Issue Information: Fortschritte der Physik 7 / 2025","authors":"","doi":"10.1002/prop.70022","DOIUrl":"https://doi.org/10.1002/prop.70022","url":null,"abstract":"","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Connecting Black Holes, Wormholes, and Compact Stars","authors":"Francisco Tello-Ortiz, Pablo León","doi":"10.1002/prop.70012","DOIUrl":"https://doi.org/10.1002/prop.70012","url":null,"abstract":"<p>Deformations on Minkowski spacetime produced by gravitational decoupling lead to new spherically symmetric and static solutions. This particular toy model interplays among a regular black hole, compact star and a wormhole spacetime. The generation of these geometries is based on the connection between vanishing complexity and conformally flat symmetry. To further corroborate the feasibility of this model, a thoroughly numerical analysis has been performed.</p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Muhammad Ali Raza, Sehar, Muhammad Azam, Muhammad Zubair, Francisco Tello-Ortiz
{"title":"Rotating Einstein–Maxwell–Dilaton Black Hole as a Particle Accelerator","authors":"Muhammad Ali Raza, Sehar, Muhammad Azam, Muhammad Zubair, Francisco Tello-Ortiz","doi":"10.1002/prop.70018","DOIUrl":"https://doi.org/10.1002/prop.70018","url":null,"abstract":"<p>Similar to particle accelerators, black holes also have the ability to accelerate particles, generating significant amounts of energy through particle collisions. In this study, the horizon and spacetime structures of a rotating black hole within the framework of Einstein–Maxwell–Dilaton gravity have been examined. Additionally, the authors have extended the analysis to explore particle collisions and energy extraction near this black hole using the Bañados-Silk-West mechanism. It has been revealed by the findings that the mass and angular momentum of the colliding particles significantly influence the center of mass energy, more so than the parameters of the black hole itself. Furthermore, the Bañados–Silk–West mechanism is applied to massless particles, particularly photons, while disregarding their intrinsic spin in plasma; an aspect that has not been previously explored. The Bañados–Silk–West mechanism has not been directly applied, as the refractive index condition only permits photon propagation, meaning that massive particles in vacuum cannot be included in this study. The propagation conditions for photons have been derived by the authors and photon collisions have been analyzed by treating them as massive particles in a dispersive medium. The impact of the plasma parameter on the extracted center of mass energy is also examined. The plasma parameter has had a relatively weak and unchanged effect on the center of mass energy across all cases, as shown by the results, indicating that energy losses due to friction within the medium are a contributing factor. </p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 with a Spontaneous Symmetry Breaking Scalar Field","authors":"Soumya Chakrabarti, Chiranjeeb Singha","doi":"10.1002/prop.70013","DOIUrl":"https://doi.org/10.1002/prop.70013","url":null,"abstract":"<p>The authors argue that a spherically symmetric traversable wormhole solution of the Einstein field equations can be supported by minimally coupled self-interacting scalar field, which allows a spontaneous symmetry breaking of the field around the wormhole throat. Two cases are studied by the authors: (i) the phantom wormhole solution of Bronnikov and (ii) a generalized Kiselev wormhole. The property of radial null geodesics is studied by authors and the metric can describe either a two-way or a one-way traversable wormhole depending on certain parameter ranges are showed. The scalar field exhibits spontaneous symmetry breaking (SSB) within the coordinate range where a wormhole throat forms and helps one suggest that SSB may act as a threshold for wormhole throat formation. The authors also computed the radius of the photon sphere, the Lyapunov exponent, the shadow radius, and the innermost stable circular orbits for the geometries.</p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Brice Bastian, Thomas W. Grimm, Damian van de Heisteeg
{"title":"Modeling General Asymptotic Calabi–Yau Periods","authors":"Brice Bastian, Thomas W. Grimm, Damian van de Heisteeg","doi":"10.1002/prop.70010","DOIUrl":"https://doi.org/10.1002/prop.70010","url":null,"abstract":"<p>In the quest to uncovering the fundamental structures that underlie some of the asymptotic Swampland conjectures the authors initiate the general study of asymptotic period vectors of Calabi–Yau manifolds. The strategy is to exploit the constraints imposed by completeness, symmetry, and positivity, which are formalized in asymptotic Hodge theory. The general principles are used to study the periods near any boundary in complex structure moduli space and explain that near most boundaries, leading exponentially suppressed corrections must be present for consistency. The only exception are period vectors near the well-studied large complex structure point. Together with the classification of possible boundaries, the procedure makes it possible to construct general models for these asymptotic periods. The starting point for this construction is the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>s</mi>\u0000 <mi>l</mi>\u0000 <mo>(</mo>\u0000 <mn>2</mn>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$sl(2)$</annotation>\u0000 </semantics></math>-data classifying the boundary, which is used to construct the asymptotic Hodge decomposition known as the nilpotent orbit. The authors then use the latter to determine the asymptotic period vector. This program has been explicitly carried out for all possible one- and two-moduli boundaries in Calabi–Yau threefolds, and general models for their asymptotic periods have been written down.</p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Issue Information: Fortschritte der Physik 6 / 2025","authors":"","doi":"10.1002/prop.70011","DOIUrl":"https://doi.org/10.1002/prop.70011","url":null,"abstract":"","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 6","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144256261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Observational Constraints On the Growth Index Parameters in \u0000 \u0000 \u0000 f\u0000 (\u0000 Q\u0000 )\u0000 \u0000 $f(Q)$\u0000 Gravity","authors":"Dalale Mhamdi, Safae Dahmani, Amine Bouali, Imad El Bojaddaini, Taoufik Ouali","doi":"10.1002/prop.70008","DOIUrl":"https://doi.org/10.1002/prop.70008","url":null,"abstract":"<p>In this study, the authors analyze constraints on the growth index of matter perturbations, <span></span><math>\u0000 <semantics>\u0000 <mi>γ</mi>\u0000 <annotation>$gamma$</annotation>\u0000 </semantics></math>, within the framework of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mo>(</mo>\u0000 <mi>Q</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$f(Q)$</annotation>\u0000 </semantics></math> gravity, using recent cosmological observations, at the background and the perturbation levels, including <span></span><math>\u0000 <semantics>\u0000 <msup>\u0000 <mtext>Pantheon</mtext>\u0000 <mo>+</mo>\u0000 </msup>\u0000 <annotation>$text{Pantheon}^{+}$</annotation>\u0000 </semantics></math>, Cosmic Chronometer (CC), and Redshift Space Distortion (RSD) datasets. The analysis focuses on quantifying the distortion parameter, which measures the deviation of the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mo>(</mo>\u0000 <mi>Q</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$f(Q)$</annotation>\u0000 </semantics></math> gravity model from the concordance <span></span><math>\u0000 <semantics>\u0000 <mi>Λ</mi>\u0000 <annotation>$Lambda$</annotation>\u0000 </semantics></math> CDM cosmology at the background level. Specifically, two cases of the growth index parameter are investigated: a constant <span></span><math>\u0000 <semantics>\u0000 <mi>γ</mi>\u0000 <annotation>$gamma$</annotation>\u0000 </semantics></math> and a time-varying <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>γ</mi>\u0000 <mo>(</mo>\u0000 <mi>z</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$gamma (z)$</annotation>\u0000 </semantics></math>. The various parametrizations of the growth index <span></span><math>\u0000 <semantics>\u0000 <mi>γ</mi>\u0000 <annotation>$gamma$</annotation>\u0000 </semantics></math> are investigated, expressed as <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>γ</mi>\u0000 <mo>=</mo>\u0000 <msub>\u0000 <mi>γ</mi>\u0000 <mn>0</mn>\u0000 </msub>\u0000 <mo>+</mo>\u0000 <msub>\u0000 <mi>γ</mi>\u0000 <mn>1</mn>\u0000 </msub>\u0000 <mi>y</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>z</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$gamma = gamma _{0} +gamma ","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"73 7","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}