The European Physical Journal C最新文献

{"title":"Charge-dependent scalarization of Einstein–Euler–Heisenberg black holes","authors":"Lina Zhang,&nbsp;Yun Soo Myung,&nbsp;De-Cheng Zou,&nbsp;Chao-Ming Zhang,&nbsp;Sheng-Yuan Li","doi":"10.1140/epjc/s10052-026-16436-y","DOIUrl":"10.1140/epjc/s10052-026-16436-y","url":null,"abstract":"<div><p>Charge-dependent scalarization of the Einstein–Euler–Heisenberg (EEH) black hole is carried out in the EEH-scalar theory by introducing an exponential scalar coupling with coupling constant <span>(alpha )</span> to the Maxwell and nonlinear electrodynamic terms. The bald black hole (EEHBH) is described by mass <i>M</i> and arbitrary magnetic charge <i>q</i> and has a single horizon when choosing the action parameter <span>(mu =0.3)</span>. Here, we find the critical onset charge <span>(q_c=r_+^2/sqrt{2mu })</span> with <span>(r_+(M,q_c))</span> the outer horizon radius from the resonance condition. The spontaneous scalarization (<span>(alpha ^+)</span>) of this black hole is available for charge <span>(0&lt;q&lt; q_c=1.115)</span> for <span>(M=1)</span> and <span>(mu =0.3)</span>, with positive <span>(alpha )</span>, whereas its new scalarization (<span>(alpha ^-)</span>) occurs for <span>(q&gt; q_c)</span> and negative <span>(alpha )</span>. The former case of <span>(q=0.5)</span> implies infinite branches of scalarized EEHBHs but its fundamental branch (<span>(n=0)</span>) is stable against the <span>(l=0)</span> modes considered here, while for <span>(q=2)</span> and <span>(q=20)</span>, one stable scalarized branch is found for each charge within the explored parameter ranges.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16436-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189424","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}

{"title":"Correction: New constraints on cosmic-ray boosted sub-Gev dark matter via light mediators","authors":"Yang Yu,&nbsp;Guan-Sen Wang,&nbsp;Bo Zhang,&nbsp;Tian-Peng Tang,&nbsp;Bing-Yu Su,&nbsp;Lei Feng","doi":"10.1140/epjc/s10052-026-16447-9","DOIUrl":"10.1140/epjc/s10052-026-16447-9","url":null,"abstract":"","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16447-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189426","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}

{"title":"Criterion for the existence of the G(3900) resonance","authors":"Yin Huang,&nbsp;Xurong Chen","doi":"10.1140/epjc/s10052-026-16432-2","DOIUrl":"10.1140/epjc/s10052-026-16432-2","url":null,"abstract":"<div><p>About 18 years ago, the BABAR and the Belle Collaborations reported evidence for a new <span>(cbar{c})</span> structure near <span>(3900~textrm{MeV})</span> in <span>(e^{+}e^{-} rightarrow Dbar{D})</span>, triggering debate over whether it represents a genuine hadronic state or arises from interference effects and the opening of the <span>(D^{*}bar{D})</span> threshold. The issue remained unsettled until 2024, when BESIII, with an enlarged <span>(e^{+}e^{-} rightarrow Dbar{D})</span> sample, confirmed the presence of the <i>G</i>(3900) structure, reviving discussion of its nature. Although it has been proposed as a <i>P</i>-wave <span>(Dbar{D}^{*})</span> molecular state, no consensus has emerged, and interference effects remain a plausible explanation. In this Letter, we show that analyzing the <span>(e^{+}e^{-}rightarrow Dbar{D})</span> cross section as a function of the transverse momentum of the final-state <i>D</i> meson reveals a prominent Jacobian peak. This feature cannot be generated by interference effects alone and thus provides direct evidence for the existence of <i>G</i>(3900). Moreover, the peak position is highly sensitive to the actual mass of <i>G</i>(3900), offering a precise determination method. The criterion illustrated by <i>G</i>(3900) can be extended to other hadronic systems, offering a powerful tool to identify genuine resonances.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16432-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132792","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}

{"title":"Brane-probes response to poly-vector deformations","authors":"Sergei Barakin,&nbsp;Angelina Kurenkova,&nbsp;Edvard T. Musaev","doi":"10.1140/epjc/s10052-026-16393-6","DOIUrl":"10.1140/epjc/s10052-026-16393-6","url":null,"abstract":"<div><p>We probe poly-vector deformations of Type II backgrounds using the fundamental string, D0-brane and D3-brane, and of the 11D membrane background by the fundamental M2-brane. We show that the corresponding deformations of the world-volume theories can be written in terms of flows similar to the <span>(textrm{T}bar{textrm{T}})</span> flow (for the D3-brane flow – with a square-root term). This interpretation works equally well for abelian (TsT) and non-abelian deformations.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16393-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132567","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}

{"title":"Consistency conditions and the derivation of harmonic structure in Einstein-Maxwell-dilaton theory","authors":"Bardia H. Fahim,&nbsp;Joshua G. Fenwick","doi":"10.1140/epjc/s10052-026-16426-0","DOIUrl":"10.1140/epjc/s10052-026-16426-0","url":null,"abstract":"<div><p>Many exact solutions of Einstein–Maxwell and Einstein–Maxwell-dilaton theory share a common structural pattern in which the metric functions are built from harmonic functions on a specified spatial base, often taken to be flat. We investigate this pattern by considering the Einstein–Maxwell-dilaton theory in arbitrary dimensions, where the dilaton field is non-trivially coupled to the Maxwell field and to a Liouville-type potential proportional to the cosmological parameter. Without imposing either the base geometry or the harmonic form of the metric function in advance, we show that for the generic branch, the field equations force the dilaton couplings to be equal, restrict the spatial base geometry to be Ricci flat, and make the metric function harmonic on this base. The resulting spacetime can then be written in terms of a conformal potential. We also consider a purely spatial branch, which instead leads to a distinct constraint on the coupling constants. These results provide a unified field-equation derivation of the harmonic behavior and conformal structure that appear in several classes of solutions, including multi-center geometries, cosmological solutions, and dynamical black holes.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16426-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133063","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}

{"title":"Fire at the tip of the throat: Hagedorn phase after brane–antibrane inflation?","authors":"Dibya Chakraborty,&nbsp;Ahmed Rakin Kamal","doi":"10.1140/epjc/s10052-026-16470-w","DOIUrl":"10.1140/epjc/s10052-026-16470-w","url":null,"abstract":"<div><p>We study the post-inflationary open-string Hagedorn phase in perturbatively moduli stabilized brane– antibrane inflation. In this class of models, the volume modulus is stabilized by perturbative corrections rather than by non-perturbative effects to the superpotential, thereby avoiding the standard brane–antibrane <span>(eta )</span>-problem. Since inflation ends through tachyon condensation and brane–antibrane annihilation, the endpoint is intrinsically stringy and need not be described immediately by an ordinary radiation bath. We analyze whether the energy released at annihilation can drive the visible sector into an open-string Hagedorn phase, and study the consequences for dark radiation. If the Standard Model (SM) branes lie in the same throat as where the annihilation occurs, we find that a modest fraction of the released energy deposited into surviving visible open strings is sufficient to enter the Hagedorn regime and can suppress the effective number of relativistic species <span>(Delta N_textrm{eff})</span> below current observational bounds. If the SM lies in a different throat, the result depends on inter-throat energy transfer: prompt or delayed transfer can still yield a visible Hagedorn phase. However, the mechanism is most efficient when the local string scale in the SM throat is lower than or comparable to that in the annihilation throat.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16470-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132832","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}

{"title":"Non-minimally coupled running curvaton for DESI-motivated dynamical dark energy","authors":"Bichu Li,&nbsp;Lei-Hua Liu","doi":"10.1140/epjc/s10052-026-16396-3","DOIUrl":"10.1140/epjc/s10052-026-16396-3","url":null,"abstract":"<div><p>Recent DESI baryon-acoustic-oscillation measurements, when combined with CMB and supernova distance data, have renewed interest in dynamical dark energy whose effective equation of state can cross the phantom divide. We investigate whether such behavior can be embedded in the running-curvaton framework by adding a Jordan-frame non-minimal coupling, <span>(xi chi ^2R)</span>. The same field is used in two regimes: as a curvaton sector in the early universe and as a late-time dark-energy component. We show that the leading early-time curvaton predictions can be preserved by retuning the effective mass parameter, while the geometric terms in the late-time pressure allow phantom-crossing background histories without introducing a phantom kinetic term. We then perform a background-level likelihood analysis using numerical solutions of the model’s late-time homogeneous background equations, a reduced CMB prior on <span>((theta _*,omega _b,omega _{bc}))</span>, the official DESI DR2 BAO data vector with full covariance, and Pantheon+ supernovae without SH0ES calibration. This likelihood tests acoustic-scale, BAO-distance and supernova-distance consistency under the assumption that the curvaton/NMC sector is negligible near recombination. The MCMC analysis gives stable derived background parameters, with <span>(H_0=67.88^{+0.53}_{-0.61},mathrm{km,s^{-1},Mpc^{-1}})</span>, <span>(Omega _m=0.3072^{+0.0059}_{-0.0054})</span>, <span>(w_0=-0.922^{+0.055}_{-0.063})</span> and <span>(w_a=-0.205^{+0.173}_{-0.182})</span>. The microscopic non-minimal-coupling parameters remain broad, skewed and long-tailed in the marginalized posterior, reflecting degeneracies under background-level data. These results should not be interpreted as a full perturbation-level CMB constraint on the non-minimally coupled curvaton. They are a reduced-CMB+BAO+SN consistency test of the homogeneous expansion history. A Boltzmann-code implementation including TT/TE/EE spectra, CMB lensing, late integrated Sachs–Wolfe effects and scalar perturbation evolution is needed for a definitive test.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16396-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133007","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}

{"title":"Correction: Dynamical systems approach and cosmological attractors in newer general relativity","authors":"Manuel Hohmann,&nbsp;Ulbossyn Ualikhanova","doi":"10.1140/epjc/s10052-026-16417-1","DOIUrl":"10.1140/epjc/s10052-026-16417-1","url":null,"abstract":"","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16417-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132831","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}

{"title":"Dissipative cosmology and the nature of dark energy: insights from bulk viscosity with DESI DR2 observations","authors":"Shahnawaz A. Adil,&nbsp;Sonej Alam,&nbsp;Somasri Sen,&nbsp;J. Alberto Vazquez","doi":"10.1140/epjc/s10052-026-16412-6","DOIUrl":"10.1140/epjc/s10052-026-16412-6","url":null,"abstract":"<div><p>We study cosmological models in which the late time accelerated expansion is driven by a bulk viscous dark energy fluid, motivated by the possibility that dissipative processes in the cosmic medium can generate an effective negative pressure without requiring a cosmological constant. Restricting our analysis to the homogeneous background evolution, we consider both minimally and non-minimally coupled viscous scenarios and analyze them using Type Ia supernovae, DESI DR2 baryon acoustic oscillation measurements, and the <i>Planck</i> 2018 cosmic microwave background data. We show that bulk viscosity naturally gives rise to dynamical dark energy behavior and can provide an alternative description of the observed expansion history. Compared to <span>(Lambda )</span>CDM, we find the interacting non–minimal model produces a marginal preference over <span>(Lambda )</span>CDM using different evidence estimations. The results demonstrate that bulk-viscous dark energy remains an observationally viable phenomenological framework at the background level however some viscous parameters remain prior-sensitive.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16412-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132833","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}

{"title":"Mass spectra of tetraquark states from the spinless Salpeter equation","authors":"Pranami Baishya,&nbsp;Bhaskar Jyoti Hazarika","doi":"10.1140/epjc/s10052-026-16342-3","DOIUrl":"10.1140/epjc/s10052-026-16342-3","url":null,"abstract":"<div><p>The mass spectrum of tetraquark states is examined using the spinless Salpeter equation alongside the Cornell potential. Analytical wave functions are derived through a variational approach, resulting in a specific mass formula for the bound states. This study investigates the mass spectra of heavy tetraquark states within a constituent diquark-antidiquark model. We employ a spinless Salpeter equation framework, incorporating the Cornell potential to describe the interaction between the diquark and antidiquark constituents. To account for relativistic effects, we utilize first-order perturbation theory to include the leading-order kinetic energy corrections arising from the expansion of the relativistic kinetic energy operator. A variational approach is adopted to determine the ground state masses, where the optimal variational parameter <span>({beta })</span> is found by minimizing the system’s energy and then for higher states. We systematically calculate the masses of several experimentally observed and predicted tetraquark candidates, across a range of strong coupling constant values. Our results demonstrate a sensitivity of the calculated tetraquark masses, and the model provides theoretical mass predictions that are in reasonable agreement with experimental observations for these exotic hadronic states. This work contributes to a deeper understanding of the internal structure and dynamics of heavy tetraquarks.\u0000\u0000\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 10","pages":""},"PeriodicalIF":4.9,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16342-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133061","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}