Fortschritte Der Physik-Progress of Physics最新文献

{"title":"Cosmological Implications of Bumblebee Theory on an FLRW Background","authors":"Manuel Gonzalez-Espinoza,&nbsp;Grigorios Panotopoulos,&nbsp;Francisco Tello-Ortiz","doi":"10.1002/prop.70110","DOIUrl":"https://doi.org/10.1002/prop.70110","url":null,"abstract":"<div>\u0000 \u0000 <p>We investigate some cosmological implications at the background level of the Bumblebee model. The phase-space, the critical points, and their stability are analyzed in detail, applying well-established dynamical system techniques. In addition, upon comparison to the available supernovae and Pantheon+SHOES data, the best-fit numerical value of the unique free parameter of the model is determined. We present graphical representations of key cosmological quantities as functions of redshift, including the deceleration parameter and the dark energy equation-of-state parameter. The statefinders and the age of the Universe are also computed. Finally, a comparison to the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Λ</mi>\u0000 <mi>CDM</mi>\u0000 </mrow>\u0000 <annotation>$Lambda{rm CDM}$</annotation>\u0000 </semantics></math> model is made as well.</p></div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148093006","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":"Reflection-Positive Construction of a Four-Dimensional SU(N) Yang–Mills Theory With Mass Gap and Confinement","authors":"Mir Faizal,&nbsp;Arshid Shabir","doi":"10.1002/prop.70097","DOIUrl":"https://doi.org/10.1002/prop.70097","url":null,"abstract":"<div>\u0000 \u0000 <p>In the Euclidean view, one must first require that positivity not be violated, and from this modest demand, together with locality, a great deal follows: starting from a reflection-positive lattice formulation of pure <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>S</mi>\u0000 <mi>U</mi>\u0000 <mo>(</mo>\u0000 <mi>N</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <annotation>$SU(N)$</annotation>\u0000 </semantics></math> Yang–Mills theory we obtain a transfer operator with a uniform gap, while large Wilson loops already show an area law by means of convergent character (polymer) expansions; a finite-range, gauge-covariant multiscale analysis then carries these features from one scale to the next with interlaced inequalities whose small defects can be summed, so that exponential clustering and a strictly positive string tension endure in the continuum; the Osterwalder–Schrader reconstruction turns these Euclidean facts into a Minkowski theory with a self-adjoint Hamiltonian, the spectral gap lying above the vacuum and the linear potential for static charges appearing, which gives a concrete picture of confinement; the construction depends on no special regulator, for a single-scale Lipschitz control and a telescoping argument bind all admissible reflection-positive slicings into a unique limiting measure and thus secure universality; moreover, the same framework admits entry from weak coupling, so that the continuum reached from strong coupling meets the one approached along an asymptotically free trajectory, yielding one and the same theory; in my view this is how mathematical clarity and physical insight cooperate: positivity, locality, and renormalization working together so that the mass gap and confinement are not marvels to be assumed, but natural properties of the non-Abelian vacuum.</p>\u0000 </div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148085993","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":"Wigner Function for Dirac–Weyl Equation in Graphene","authors":"Erik Díaz-Bautista,&nbsp;Maciej Przanowski,&nbsp;Jaromir Tosiek,&nbsp;Francisco J. Turrubiates","doi":"10.1002/prop.70104","DOIUrl":"https://doi.org/10.1002/prop.70104","url":null,"abstract":"<div>\u0000 \u0000 <p>A study of the Wigner functions for massless Dirac fermions in a graphene layer lying in the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>x</mi>\u0000 <mi>y</mi>\u0000 </mrow>\u0000 <annotation>$xy$</annotation>\u0000 </semantics></math> plane interacting with a homogeneous external magnetic field <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mover>\u0000 <mi>B</mi>\u0000 <mo>⃗</mo>\u0000 </mover>\u0000 <mo>=</mo>\u0000 <msub>\u0000 <mi>B</mi>\u0000 <mn>0</mn>\u0000 </msub>\u0000 <mover>\u0000 <mi>k</mi>\u0000 <mo>̂</mo>\u0000 </mover>\u0000 </mrow>\u0000 <annotation>$vec{B}=B_{0}hat{k}$</annotation>\u0000 </semantics></math> is provided. Since, at low-energy excitations, the Dirac–Weyl equation is what describes the movement of such charge carriers and is a matrix equation, it is necessary to describe the Wigner function as a matrix function in phase space. By solving the <span></span><math>\u0000 <semantics>\u0000 <mo>∗</mo>\u0000 <annotation>$*$</annotation>\u0000 </semantics></math>-Dirac–Weyl equation, the Landau levels, as well as the Wigner functions for graphene electrons in the presence of a magnetic field, are obtained.</p></div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148079224","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":"Consequences of Thermal Fluctuations and Shadows of Nonsingular Black Hole in 4D Einstein–Gauss–Bonnet Gravity","authors":"Muhammad Israr Aslam,&nbsp;Sultan Hussain,&nbsp;Hamail Tabasum Naseer,&nbsp;Abdul Malik Sultan","doi":"10.1002/prop.70107","DOIUrl":"https://doi.org/10.1002/prop.70107","url":null,"abstract":"<div>\u0000 \u0000 <p>In this work, we investigate the thermal stability of black holes (BHs) in the presence of thermal fluctuations. We consider a static spherically symmetric nonsingular BH in 4D Einstein–Gauss–Bonnet (EGB) gravity coupled with nonlinear electrodynamics (NED) in an AdS spacetime. We interpret many thermodynamical quantities like temperature, entropy, Helmholtz free energy, internal energy, pressure, enthalpy, Gibbs free energy, and specific heat and interpret how the variations in coupling parameter <span></span><math>\u0000 <semantics>\u0000 <mi>α</mi>\u0000 <annotation>$alpha$</annotation>\u0000 </semantics></math> and NED parameter <span></span><math>\u0000 <semantics>\u0000 <mi>g</mi>\u0000 <annotation>$g$</annotation>\u0000 </semantics></math> impact the stability and phase transitions of the BHs. We further examined the distinctive characteristics of BH shadow images observed for different values of both <span></span><math>\u0000 <semantics>\u0000 <mi>g</mi>\u0000 <annotation>$g$</annotation>\u0000 </semantics></math> and <span></span><math>\u0000 <semantics>\u0000 <mi>α</mi>\u0000 <annotation>$alpha$</annotation>\u0000 </semantics></math>. The obtained results of BH shadow contours indicate that the increasing values of both <span></span><math>\u0000 <semantics>\u0000 <mi>g</mi>\u0000 <annotation>$g$</annotation>\u0000 </semantics></math> and <span></span><math>\u0000 <semantics>\u0000 <mi>α</mi>\u0000 <annotation>$alpha$</annotation>\u0000 </semantics></math>, results in decrease the BH shadow radius significantly. Subsequently, we also investigate the infalling spherical accretion of BH shadows. The results indicate that while variations in relevant parameters do influence the central dark region, the primary factor is the change in observational appearance of the bright photon ring, which appears at the position of the photon sphere.</p></div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148079225","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":"Matter Creation Cosmology With Decaying Vacuum Energy: Observational and Thermodynamical Analyses","authors":"Lokesh Chander,&nbsp;C. P. Singh","doi":"10.1002/prop.70105","DOIUrl":"https://doi.org/10.1002/prop.70105","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, we present an alternative to standard dark energy (DE), where the vacuum energy density (VED) decays and generates the dark matter (DM) via gravitationally induced creation. This decay is considered as an irreversible energy flow maintaining the thermodynamic equilibrium through the constant entropy per particle. Motivated by quantum field theoretic considerations of vacuum decay and adiabatic matter creation, we analyze both the background dynamics and the growth rate of perturbations. The model is confronted with diverse datasets, including cosmic chronometers, Pantheon Type Ia supernovae (SNIa), Baryon acoustic oscillations, cosmic microwave background distance priors, weighted linear growth rate measurements and the local R22 value of <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>H</mi>\u0000 <mn>0</mn>\u0000 </msub>\u0000 <annotation>$H_0$</annotation>\u0000 </semantics></math>, with parameter estimation performed via Markov Chain Monte Carlo (MCMC) methods. Model comparison is performed using the Akaike information criterion (AIC), the Deviance information criterion (DIC), and Bayesian evidence quantified through the Bayes factor. Our results show a consistent transition from a decelerated to an accelerated expansion phase, with present Hubble parameter estimates lying between the Planck and SH0ES values. The structure growth parameter <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mn>8</mn>\u0000 </msub>\u0000 <annotation>$S_8$</annotation>\u0000 </semantics></math> is also compatible with Planck 2018 and recent weak lensing surveys. A thermodynamic analysis confirms consistency with the generalized second law (GSL), and including Casimir contributions provides further insights into the model's dynamics. Overall, the proposed model effectively captures the Universe's evolution at both theoretical and observational levels.</p></div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148078565","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":"Algebraic Realisation of the Zamolodchikov Metric in Narain Theories","authors":"E. H Saidi,&nbsp;R. Sammani","doi":"10.1002/prop.70098","DOIUrl":"https://doi.org/10.1002/prop.70098","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;We revisit Narain conformal field theories (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;NCFT&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;${rm NCFT}_{2}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;)from an algebraic perspective based on finite dimensional Lie algebras &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;annotation&gt;$mathbf {g}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and representations &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$mathcal {R}_{mathbf {g}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and show how the root and weight lattices can encode the momenta and subsequently the partition functions of Narain theories. In this framework, we construct a realisation of the Zamolodchikov metric of the moduli space &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$mathcal {M}_{mathbf {g}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; in terms of Lie algebraic data, namely, the Cartan matrix &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;K&lt;/mi&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;${rm K}_{mathbf {g}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and its inverse &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;K&lt;/mi&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;annotation&gt;${rm K}_{ mathbf {g}}^{-1}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. Properties regarding the ensemble averaging of these CFTs and their holographic dual are also derived. Additionally, we discuss possible generalisations to NCFTs having dis-symmetric central charges &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$(mathrm{c}_{L},mathrm{c}_{R})=(mathrm{s}, mathrm{r})$&lt;/annotation&gt;\u0000 &lt;/semantics","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683810","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":"Tessellation Groups, Harmonic Analysis on Non-Compact Symmetric Spaces and the Heat Kernel in View of Cartan Convolutional Neural networks","authors":"Pietro Fré,&nbsp;Federico Milanesio,&nbsp;Marcelo Oyarzo,&nbsp;Matteo Santoro,&nbsp;Mario Trigiante","doi":"10.1002/prop.70099","DOIUrl":"https://doi.org/10.1002/prop.70099","url":null,"abstract":"&lt;p&gt;In this paper, we continue the development of the Cartan neural networks programme, launched with three previous publications, by focusing on some mathematical foundational aspects that we deem necessary for our next steps forward. The mathematical and conceptual results are diverse and span various mathematical fields, but the inspiring motivation is unified. The aim is to introduce layers that are mathematically modeled as non-compact symmetric spaces, each mapped onto the next one by solvable group homomorphisms. In particular, in the spirit of convolutional neural networks, we have introduced the notion of Tits–Satake (TS) vector bundles where the TS submanifold is the base space. Within this framework, the tiling of the base manifold, the representation of bundle sections using harmonics, and the need for a general theory of separator walls motivated a series of mathematical investigations that produced both definite and partial results. Specifically, we present the group theoretical construction of the separators for all non-compact symmetric spaces &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;U&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;H&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$mathrm{U/H}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, as well as of the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Δ&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;8&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$Delta _{8,3,2}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; tiling group and its normal Fuchsian subgroups, respectively, yielding the uniformization of the genus &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$g=3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; Fermat quartic and of the genus &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;g&lt;/mi&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$g=2$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; Bolza surface. The quotient automorphic groups are studied. Furthermore, we found a new representation of the Laplacian Green function and the Heat Kernel on Hyperbolic Spaces &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;H&lt;/mi&gt;\u0000 &lt;mi&gt;n&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;annotation&gt;$mathbb {H}^{n}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and a setup for the construction of th","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70099","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683606","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":"Kaniadakis Holographic Dark Energy Behavior in f(Q) Theory","authors":"Sinem Kalkan,&nbsp;Can Aktaş","doi":"10.1002/prop.70102","DOIUrl":"https://doi.org/10.1002/prop.70102","url":null,"abstract":"<p>In this study, the cosmological behavior of the Kaniadakis holographic dark energy model is investigated under 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> theory within the framework of a flat Friedmann–Robertson–Walker (FRW) universe. The generalized holographic energy density based on Kaniadakis entropy is modeled using the Hubble horizon infrared cutoff scale, and the field equations are solved analytically. Using the obtained solutions, the evolution of fundamental cosmological quantities such as the deceleration parameter, the equation of state parameter, and the statefinder parameters as a function of time and redshift is analyzed in detail. It is shown that the model successfully describes the transition to time-accelerated expansion and gives a value of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>q</mi>\u0000 <mn>0</mn>\u0000 </msub>\u0000 <mo>≈</mo>\u0000 <mo>−</mo>\u0000 <mn>0.508</mn>\u0000 </mrow>\u0000 <annotation>$q_0 approx -0.508$</annotation>\u0000 </semantics></math>, consistent with current observational data. Furthermore, it is observed that in the statefinder plane, the model exhibits a dynamic dark energy behavior close to the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Λ</mi>\u0000 <mi>CDM</mi>\u0000 </mrow>\u0000 <annotation>$Lambda{rm CDM}$</annotation>\u0000 </semantics></math> scenario, but tends toward the de Sitter universe in the long term. The results show that 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> theory of gravity, when considered together with Kaniadakis holographic dark energy, offers a consistent and viable framework for explaining the late-stage accelerating expansion of the universe.</p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683685","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":"Noncoincidence f(Q)-Cosmology with Dark Matter Coupled to Gravity","authors":"A. Abebe,&nbsp;P. S. Apostolopoulos,&nbsp;A. Giacomini,&nbsp;G. Leon,&nbsp;F. Moncada,&nbsp;A. Paliathanasis","doi":"10.1002/prop.70100","DOIUrl":"https://doi.org/10.1002/prop.70100","url":null,"abstract":"<div>\u0000 \u0000 <p>We investigate Friedmann–Lemaître–Robertson–Walker (FLRW) cosmology in the framework of symmetric teleparallel <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 with a nonminimal coupling between dark matter and the gravitational field. In the noncoincidence gauge, the field equations admit an equivalent multi-scalar field representation, which we investigate the phase-space using the Hubble-normalization approach. We classify all stationary points for arbitrary function <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> and we discuss the physical properties of the asymptotic solutions. For the power-law theory, we perform a detailed stability analysis and show that the de Sitter solution is the unique future attractor, while the matter-dominated point appears as a saddle point. Moreover, there exist a family of scaling solutions that can be related to inflationary dynamics. In contrast with uncoupled <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> models, the presence of the coupling introduces a viable matter-dominated era alongside late-time accelerated expansion. Our study shows that the coupling function plays a crucial role in cosmological dynamics in <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.</p>\u0000 </div>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683657","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":"Impact of Quantum Gravity on the UV Sensitivity of Extremal Black Holes","authors":"Francesco Del Porro,&nbsp;Francesco Ferrarin,&nbsp;Alessia Platania","doi":"10.1002/prop.70101","DOIUrl":"https://doi.org/10.1002/prop.70101","url":null,"abstract":"<p>Recent work has revealed that extremal Kerr black holes may exhibit a sensitivity to higher-derivative corrections to Einstein's equations, displaying singularities in the tidal forces at the horizon. However, in a purely gravitational context, this “ultraviolet sensitivity” translates into a strong dependence on the Wilson coefficients in the low-energy effective field theory. These, in turn, are fixed by the underlying theory of quantum gravity in the ultraviolet. We find a prediction for these coefficients within the framework of asymptotically safe quantum gravity, and show that, if the quantum gravity scale is trans-Planckian, this horizon-scale ultraviolet sensitivity is avoided.</p>","PeriodicalId":55150,"journal":{"name":"Fortschritte Der Physik-Progress of Physics","volume":"74 4","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/prop.70101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683351","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}