The European Physical Journal C最新文献_第10页

Light states in real 3HDMs with spontaneous CP violation and softly broken symmetries 具有自发CP破坏和对称软破缺的真实3HDMs中的光态

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-05 DOI: 10.1140/epjc/s10052-026-16182-1

José M. Camacho, Carlos Miró, Miguel Nebot, Daniel Queiroz, Tomás Tobarra

引用次数: 0

Late-time varying-speed-of-light test of the DESI DR2 geometrical preference DESI DR2几何偏好的后期变光速检验

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-05 DOI: 10.1140/epjc/s10052-026-16207-9

Shangyun Wang, Shengjia Wang

{"title":"Late-time varying-speed-of-light test of the DESI DR2 geometrical preference","authors":"Shangyun Wang, Shengjia Wang","doi":"10.1140/epjc/s10052-026-16207-9","DOIUrl":"10.1140/epjc/s10052-026-16207-9","url":null,"abstract":"<div>The second data release of the Dark Energy Spectroscopic Instrument (DESI DR2) has sharpened the question of whether late-time geometrical observations prefer a departure from the minimal (Lambda textrm{CDM}) distance–redshift relation. We examine a deliberately restricted alternative interpretation: whether the same late-time distance information can be absorbed by an effective redshift dependence of the photon propagation factor. We introduce the dimensionless ratio (C(z)equiv c(z)/c_0) and adopt the bounded one-parameter form (C(z)=1+epsilon z/(1+z)), with (epsilon =0) corresponding to the constant-speed limit. The analysis uses only late-time data: DESI DR2 compressed (textrm{BAO}) measurements, 31 cosmic-chronometer (H(z)) points, and Type Ia supernova Hubble diagrams from DES-Dovekie and Pantheon-plus. The sound horizon (r_d) is sampled as an independent free parameter with the uniform prior (r_din [120,180],textrm{Mpc}), while the supernova intercept is profiled analytically; no CMB-calibrated sound-horizon prior and no distance-ladder prior are imposed. For the main DES-Dovekie+DESI DR2+(H(z)) combination we obtain (epsilon =-0.096^{+0.125}_{-0.114}). Replacing DES-Dovekie by Pantheon-plus gives (epsilon =-0.048^{+0.142}_{-0.122}). The VSL extension improves the minimum (chi ^2) by only (1.05) relative to flat (Lambda textrm{CDM}), and is penalized by both AIC and BIC. Allowing spatial curvature changes the geometrical degeneracy directions but still gives (epsilon ) consistent with zero. These results show that DESI DR2-era late-time geometry provides a useful null test of cosmological light-speed constancy, but does not support a one-parameter late-time VSL explanation of the DESI geometrical preference.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16207-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

The generalized Maxwell–Boltzmann distribution and its application on the Jeans mass 广义Maxwell-Boltzmann分布及其在Jeans质量上的应用

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-05 DOI: 10.1140/epjc/s10052-026-16137-6

Mustafa Senay, Maryam Seifi, Hosein Mohammadzadeh

{"title":"The generalized Maxwell–Boltzmann distribution and its application on the Jeans mass","authors":"Mustafa Senay, Maryam Seifi, Hosein Mohammadzadeh","doi":"10.1140/epjc/s10052-026-16137-6","DOIUrl":"10.1140/epjc/s10052-026-16137-6","url":null,"abstract":"<div>The classical Jeans mass criterion, a cornerstone of astrophysics, predicts the gravitational collapse of a homogeneous, self-gravitating gas cloud based on the Maxwell–Boltzmann velocity distribution. However, this framework often fails to account for the observed unstability of Bok globules, whose measured masses frequently fall below the classical threshold. In this study, we derive a generalized Jeans mass, ( M_J(gamma ) ), from first principles by replacing the standard distribution with a Mittag-Leffler modified Maxwell–Boltzmann (MLMB) distribution. This formalism introduces a parameter, ( gamma ), which quantifies the deviation from classical statistical mechanics. We demonstrate that for specific critical values of ( gamma ), the generalized Jeans mass aligns precisely with the observed masses of unstable Bok globules, successfully resolving the classical paradox. A comparative analysis shows that our statistical mechanical generalization achieves quantitative agreement with alternative resolutions invoking dark matter backgrounds or modified gravity. This establishes the MLMB framework as a fundamental and versatile approach for modeling gravitational instability, where the parameter ( gamma ) effectively captures the complex internal dynamics of molecular clouds.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16137-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

GPU acceleration of optical photon propagation in low photon yield applications: Opticks for the Electron Ion Collider 低光子产率应用中光光子传播的GPU加速：电子离子对撞机的光学

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-05 DOI: 10.1140/epjc/s10052-026-16180-3

Gabor Galgoczi, Kolja Kauder, Maxim Potekhin, Sakib Rahman, Dmitri Smirnov, Torre Wenaus

{"title":"GPU acceleration of optical photon propagation in low photon yield applications: Opticks for the Electron Ion Collider","authors":"Gabor Galgoczi, Kolja Kauder, Maxim Potekhin, Sakib Rahman, Dmitri Smirnov, Torre Wenaus","doi":"10.1140/epjc/s10052-026-16180-3","DOIUrl":"10.1140/epjc/s10052-026-16180-3","url":null,"abstract":"<div>The bulk of the time required to simulate Cherenkov and scintillation detectors is consumed by optical photon transport, a task that GPUs are uniquely qualified to perform. We present EIC-Opticks, a fork of Opticks, which uses event aggregation to drastically accelerate photon transport simulation for low-to-moderate photon yield experiments. During the full Geant4 Monte Carlo simulation of a given detector, optical photon simulation is performed on GPU(s) using the NVIDIA OptiX framework. We validate this approach using the ePIC pfRICH detector. We find GPU and CPU simulations in excellent agreement, with hit totals agreeing at the (0.06%) level and wavelength/radial projections giving (chi ^2/textrm{ndf}simeq 1). At the pfRICH physics program benchmark of (10^5) muons at (p=5~textrm{GeV}/c), EIC-Opticks shows (13.2pm 0.5times ) speedup over 20-thread Geant4 and (234pm 10times ) over a single thread. In the case of low-to-moderate applications event aggregation reduces the per-photon simulation time from about (40~upmu textrm{s}) for single events to about (20~textrm{ns}) with batching, a factor of about (2.3times 10^3). In order to make EIC-Opticks easily installable, we authored a Spack package that makes it possible to install it with a single command. Additionally, a Docker image is provided for users with EIC-Opticks installed. EIC-Opticks provides guardrails for common pitfalls such as deeply nested boolean volumes, maximum-reflection scans, and OptiX ray-origin-offset scans.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16180-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Dynamical analysis of the covariant f(Q) gravity models 协变f(Q)重力模型的动力学分析

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-04 DOI: 10.1140/epjc/s10052-026-16075-3

S. A. Narawade, S. A. Kadam

{"title":"Dynamical analysis of the covariant f(Q) gravity models","authors":"S. A. Narawade, S. A. Kadam","doi":"10.1140/epjc/s10052-026-16075-3","DOIUrl":"10.1140/epjc/s10052-026-16075-3","url":null,"abstract":"<div>In this study, we explore the cosmological evolution of the Universe in the framework of covariant f(Q) gravity, with a coupling function that evolves dynamically in proportion to the Hubble parameter. Two specific forms of the function are examined: a power-law model and a logarithmic model. By rewriting the cosmological field equations as an autonomous dynamical system, we determine and classify the corresponding critical points and analyze their stability. Our results show that both models are able to reproduce the sequence of cosmic evolution, including radiation, matter, and dark energy-dominated eras, along with the transitions between them. The physical properties at each critical point are described using key cosmological quantities such as the total EoS parameter, density parameters, and the deceleration parameter. The stability of the non-hyperbolic critical point is analyzed through center manifold theory. In addition, we present phase space trajectories along with the stability behavior of each critical point. The evolution plots for the density parameters of radiation, matter, and dark energy, along with the Equation of State (EoS) parameter for the total, are illustrated for further analysis. Overall, the analysis suggests that the f(Q) models considered here, within the context of covariant formulation, provide a consistent description of cosmic evolution and offer a promising approach to explaining the late-time acceleration of the Universe.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16075-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Endpoint control of thermodynamic topological classes for fixed charge d-dimensional Reissner–Nordström black holes in a cavity 空腔中固定电荷d维Reissner-Nordström黑洞热力学拓扑类的端点控制

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-04 DOI: 10.1140/epjc/s10052-026-16203-z

Rongrong Zhai

{"title":"Endpoint control of thermodynamic topological classes for fixed charge d-dimensional Reissner–Nordström black holes in a cavity","authors":"Rongrong Zhai","doi":"10.1140/epjc/s10052-026-16203-z","DOIUrl":"10.1140/epjc/s10052-026-16203-z","url":null,"abstract":"<div>We study thermodynamic topological classes of d-dimensional Reissner–Nordström (RN) black holes in a cavity at fixed charge. Starting from the reduced Euclidean action, we use the quasilocal energy, entropy, and on-shell inverse temperature to construct the off-shell vector field. The central question is which boundary thermodynamic quantities, rather than which local branch formulas, determine the refined thermodynamic topological class. A finite cavity gives two charge dependent classes: neutral black holes belong to (W^{0-}), whereas charged black holes belong to (W^{1+}). If the cavity radius is sent to infinity at fixed physical charge, the endpoint thermodynamic quantities change, giving (W^{1-}) for the neutral case and (W^{0+}) for the charged case. Thus the electric charge and the outer boundary, rather than the spacetime dimension in the explicit four- and five-dimensional examples, determine the refined topological class within this RN cavity family. The result identifies the cavity wall as part of the endpoint thermodynamic input entering the boundary degree, not merely as a thermodynamic regulator.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16203-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

A winding number analysis of Schwarzschild black hole stability in light of Planck-scale modified kinematics 基于普朗克尺度修正运动学的史瓦西黑洞稳定性圈数分析

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-04 DOI: 10.1140/epjc/s10052-026-16186-x

Mohsen Khodadi, Nosratolla Jafari, Shahin Mamedov

{"title":"A winding number analysis of Schwarzschild black hole stability in light of Planck-scale modified kinematics","authors":"Mohsen Khodadi, Nosratolla Jafari, Shahin Mamedov","doi":"10.1140/epjc/s10052-026-16186-x","DOIUrl":"10.1140/epjc/s10052-026-16186-x","url":null,"abstract":"<div>Determining whether Planck-scale effects can stabilize black holes addresses fundamental questions about black hole evaporation and quantum gravity consistency. Here, we analyze the thermodynamic topology ofSchwarzschild black holes under Planck-scale modified kinematics, using a cubic entropy correction derived from a well-known phenomenological MDR with leading correction (eta E^3/E_P). Enforcing physical constraints ((S'(r_h) > 0), (T > 0)) via the entropy-geometry correspondence, we find a single unstable branch with (w = -1) and (W = -1) for both signs of the correction parameter. A second root suggesting stability ((w = +1)) is excluded due to negative mass/temperature and lies outside the perturbative regime. Thus, this class of MDRs does not yield stable Schwarzschild black holes. However, MDRs with different leading-order corrections may behave otherwise, leaving the search for Planck-scale stabilization an open endeavor.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16186-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Observational signatures of negative mass wormholes through their shadows 透过虫洞的阴影观测到负质量虫洞的特征

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-03 DOI: 10.1140/epjc/s10052-026-16172-3

Shin’ichi Nojiri, Sergei D. Odintsov, Diego Sáez-Chillón Gómez

引用次数: 0

Emergent dark matter and dark energy from a lattice model 来自晶格模型的涌现暗物质和暗能量

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-03 DOI: 10.1140/epjc/s10052-026-16170-5

Luis Lozano, Hugo García-Compeán

{"title":"Emergent dark matter and dark energy from a lattice model","authors":"Luis Lozano, Hugo García-Compeán","doi":"10.1140/epjc/s10052-026-16170-5","DOIUrl":"10.1140/epjc/s10052-026-16170-5","url":null,"abstract":"<div>We propose a quantum bosonic qubit model on a fcc lattice that realizes the canonical source structure of mimetic dark matter as a defect of a rank-two lattice Gauss law. The standard contribution from general relativity is implemented similarly to previous works in the literature, while the mimetic sector modifies the constraint equations through additional source terms. Different theories such as mimetic dark matter, vector mimetic dark matter, and tensor–vector–scalar models are implemented on the lattice. In all these cases, a generalized Gauss law incorporates an additional Gauss-law (topological) defect depending on the type of generalization, but always fitting into the structure of the defects from the general relativity contribution. We also derive the resulting charge-selection rules for the defect sectors and show, in a worked example, that a localized defect sources a long-range rank-two field whose trace-free representative is exactly the Bowen–York momentum solution of canonical gravity. The mimetic constraint is treated in its full ADM form, retaining the normal derivative of the scalar field, and the known ghost and gradient instabilities of the minimal continuum mimetic theory are summarized. The lattice construction is therefore presented as a formal realization of the canonical source structure rather than as a complete cosmological model. \u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16170-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Holographic study of the scalar meson (K_0^*(1430)) with dynamical longitudinal confinement 具有动态纵向约束的标量介子(K_0^*(1430))的全息研究

IF 4.9 2区物理与天体物理

The European Physical Journal C Pub Date : 2026-08-03 DOI: 10.1140/epjc/s10052-026-16144-7

O. Hemmati, R. Khosravi

{"title":"Holographic study of the scalar meson (K_0^*(1430)) with dynamical longitudinal confinement","authors":"O. Hemmati, R. Khosravi","doi":"10.1140/epjc/s10052-026-16144-7","DOIUrl":"10.1140/epjc/s10052-026-16144-7","url":null,"abstract":"<div>Within the framework of light-front holographic QCD, where transverse confinement is inherently realized through holography, the structure and mass spectrum of the light scalar meson (K_0^{*}(1430)) are investigated by employing the invariant mass ansatz and enhancing the model with a longitudinal confinement potential (specifically, the ’t Hooft equation and the analytically solvable LMZV potential). The combined transverse and longitudinal confinement dynamics lead to more reliable calculations of key observables, including decay constants, parton distribution function, (xi )-moments, and twist-2 and twist-3 distribution amplitudes. Transition form factors for the semileptonic decay (B rightarrow K_0^{*} ell ^+ ell ^-) are computed from these amplitudes, yielding predictions for differential branching ratios and longitudinal lepton polarization asymmetries as functions of (q^2). The results are compared with other theoretical models, offering valuable insights into the non-perturbative dynamics of QCD. The predicted observables provide theoretically motivated benchmarks for future experimental investigations of (Brightarrow K_0^*(1430)ell ^+ell ^-) decays at LHCb and Belle II.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 8","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16144-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0