The European Physical Journal C最新文献

{"title":"On the explicit asymptotic symmetry breaking of (sl(3,mathbb {R})) Jackiw–Teitelboim gravity","authors":"H. T. Özer,&nbsp;Aytül Filiz","doi":"10.1140/epjc/s10052-025-14301-y","DOIUrl":"10.1140/epjc/s10052-025-14301-y","url":null,"abstract":"<div><p>This study investigates the asymptotic symmetry algebras (ASA) of Jackiw–Teitelboim (JT) gravity within the framework of <span>(mathfrak {sl}(3,mathbb {R}))</span> symmetry. By explicitly constructing this algebra, we explore how the presence of the dilaton field influences the structure of asymptotic symmetries and symmetry breaking mechanisms at the AdS<span>(_2)</span> boundary. For the <span>(mathfrak {sl}(3,mathbb {R}))</span> model, the dilaton field preserves a subset of the complete <span>(W_3)</span>-symmetry, restricting the algebra to <span>(mathfrak {sl}(3,mathbb {R}))</span>. These results provide deeper insights into the role of dilaton dynamics in holographic dualities, with implications for the thermodynamics and geometry of AdS<span>(_2)</span>. The findings pave the way for systematically exploring extended gauge symmetries in two-dimensional gravity and their relevance to higher-rank Lie algebras.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14301-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117727","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":"Pure Gauss–Bonnet NUT black hole solution: II","authors":"Sajal Mukherjee,&nbsp;Subhajit Barman","doi":"10.1140/epjc/s10052-025-14293-9","DOIUrl":"10.1140/epjc/s10052-025-14293-9","url":null,"abstract":"<div><p>In the present article, we have obtained an exact analytical solution of six-dimensional pure Gauss–Bonnet gravity in the presence of both NUT and Maxwell charges. The topology of the horizon is chosen to be the product of two 2-spheres. Upon evaluating the solution, we study the spacetime properties, such as the event horizon and singularity, and obtain the ranges of parameter space where the solution is valid. We discuss how the presence of Maxwell charges may impact the solution’s asymptotic expansion and what distinctive effects it will bring to the geometry. The thermodynamic properties of the solution are also discussed, emphasizing the interplay between NUT and Maxwell charges.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14293-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108651","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":"Periodical orbits and waveforms with spontaneous Lorentz symmetry-breaking in Kalb–Ramond gravity","authors":"Ednaldo L. B. Junior,&nbsp;José Tarciso S. S. Junior,&nbsp;Francisco S. N. Lobo,&nbsp;Manuel E. Rodrigues,&nbsp;Diego Rubiera-Garcia,&nbsp;Luís F. Dias da Silva,&nbsp;Henrique A. Vieira","doi":"10.1140/epjc/s10052-025-14299-3","DOIUrl":"10.1140/epjc/s10052-025-14299-3","url":null,"abstract":"<div><p>In this paper, we study time-like geodesics around a spherically symmetric black hole in Kalb–Ramond (KR) gravity, characterized by the parameter <i>l</i>,  which induces spontaneous Lorentz symmetry breaking. The geodesic equations and effective potential are derived to investigate the influence of <i>l</i>. We calculate the marginally bound orbits and innermost stable circular orbits, analyzing the parameter’s impact. Periodic orbits are computed numerically and classified within the standard taxonomy, revealing significant effects of <i>l</i> on their momentum and energy. Additionally, we explore an extreme mass ratio inspiral system under the adiabatic approximation to derive gravitational waveforms emitted by an object orbiting a supermassive black hole in KR gravity. These waveforms reflect the distinctive characteristics of periodic orbits and highlight the influence of <i>l</i>. With advancements in gravitational wave detection, these results offer insights into black holes influenced by Lorentz symmetry-breaking fields.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14299-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100318","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":"PhaseTracer2: from the effective potential to gravitational waves","authors":"Peter Athron,&nbsp;Csaba Balázs,&nbsp;Andrew Fowlie,&nbsp;Lachlan Morris,&nbsp;William Searle,&nbsp;Yang Xiao,&nbsp;Yang Zhang","doi":"10.1140/epjc/s10052-025-14258-y","DOIUrl":"10.1140/epjc/s10052-025-14258-y","url":null,"abstract":"<div><p>In recent years, the prospect of detecting gravitational waves sourced from a strongly first-order cosmological phase transition has emerged as one of the most exciting frontiers of gravitational wave astronomy. Cosmological phase transitions are an essential ingredient in the Standard Model of particle cosmology, and help explain the mechanism for creation of matter in the early Universe, provide insights into fundamental theories of physics, and shed light on the nature of dark matter. This underscores the significance of developing robust end-to-end tools for determining the resulting gravitational waves from these phase transitions. In this article we present <span>PhaseTracer2</span>, an improved version of the <span>C++</span> software package <span>PhaseTracer</span>, designed for mapping cosmological phases and transitions in Standard Model extensions of multiple scalar fields. Building on the robust framework of its predecessor, <span>PhaseTracer2</span> extends its capabilities by including new features crucial for a more comprehensive analysis of cosmological phase transitions. It can calculate more complex properties, such as the bounce action through the path deformation method or an interface with <span>BubbleProfiler</span>, thermodynamic parameters, and gravitational wave spectra. Its applicability has also been broadened via incorporating the dimensionally reduced effective potential for models obtained from <span>DRalgo</span>, as well as calculations in the <span>(overline{text {MS}})</span> and OS-like renormalisation schemes. This modular, flexible, and practical upgrade retains the speed and stability of the original <span>PhaseTracer</span>, while significantly expanding its utility.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14258-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108650","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":"Are the new particles heavy or light in (b rightarrow s E_{textrm{miss}})?","authors":"Quan-Yi Hu","doi":"10.1140/epjc/s10052-025-14290-y","DOIUrl":"10.1140/epjc/s10052-025-14290-y","url":null,"abstract":"<div><p>In this work, we study the <span>(B^+rightarrow K^+ E_{textrm{miss}})</span>, <span>(B^0rightarrow K^{*0} E_{textrm{miss}})</span>, and <span>(Lambda _b^0rightarrow Lambda ^0 E_{textrm{miss}})</span> decays under three different new physics hypotheses: the heavy new particles, the light neutral vector particles, and the axion-like particles. We find that all three hypotheses can resolve the Belle-II excess, and they can be clearly distinguished by the longitudinal polarization fraction of <span>(K^*)</span>. Furthermore, we discover that the longitudinal polarization fraction of <span>(Lambda )</span> can be used to distinguish the chirality of the effective operators.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14290-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091214","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":"Footprint in fitting (Brightarrow D) vector form factor and determination for D-meson leading-twist LCDA","authors":"Sheng-Bo Wu,&nbsp;Hai-Jiang Tian,&nbsp;Yin-Long Yang,&nbsp;Wei Cheng,&nbsp;Hai-Bing Fu,&nbsp;Tao Zhong","doi":"10.1140/epjc/s10052-025-14275-x","DOIUrl":"10.1140/epjc/s10052-025-14275-x","url":null,"abstract":"<div><p>In this paper, we fit the <span>(Brightarrow D)</span> vector transition form factor (TFF) by using the data measured by <i>BABAR</i> and Belle Collaborations within Monte Carlo (MC) method. Meanwhile, the <span>(Brightarrow D)</span> TFF is also calculated by using the QCD light-cone sum rules approach (LCSRs) within right-handed chiral current correlation function. In the TFF, <i>D</i>-meson leading-twist light-cone distribution amplitude (LCDA) is the most important non-perturbative input parameter, the precise behavior of which is mainly determined by the parameter <span>(B_{2;D})</span> in the light-cone harmonic oscillator model. Through fitting the TFF, we determine the value <span>(B_{2;D}=0.445)</span>. Then, we present the curve of <i>D</i>-meson leading-twist LCDA in comparison with other theoretical approaches. Subsequently, the <span>(Brightarrow D)</span> TFF <span>(f_{+}^{BD}(q^2))</span> at the large recoil region is <span>(f_{+}^{BD}(0)=0.648_{-0.063}^{+0.067})</span>, which is compared in detail with theoretical estimates and experimental measurements. Furthermore, we calculated the decay width and branching fractions of the Cabibbo-favored semileptonic decays <span>(Brightarrow Dell ^+nu _{ell })</span>, which lead to the results <span>({mathcal {B}}(B^0rightarrow D^-ell ^+nu _{ell }) =(2.10_{-0.38}^{+0.44})times 10^{-2})</span> and <span>({mathcal {B}}(B^+rightarrow {bar{D}}^0ell ^+nu _{ell }) =(2.26_{-0.41}^{+0.48})times 10^{-2})</span>. Finally, we predict the CKM matrix element with two scenarios <span>(|V_{cb}|_{textrm{SR}}=41.55_{-4.50}^{+4.91}times 10^{-3})</span> and <span>(|V_{cb} |_{textrm{MC}}=41.47_{-2.66}^{+2.55 }times 10^{-3})</span> from <span>(B^0rightarrow D^-ell ^+nu _{ell })</span>, <span>(|V_{cb}|_{textrm{SR}}=40.54_{-3.80}^{+4.33}times 10^{-3})</span> and <span>(|V_{cb} |_{textrm{MC}}=40.46_{-1.38}^{+1.40}times 10^{-3})</span> from <span>(B^+rightarrow {bar{D}}^0ell ^+nu _{ell })</span> which are in good agreement with theoretical and experimental predictions.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14275-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084806","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":"QPOs tests and circular motions of charged particles around magnetized Bocharova–Bronnikov–Melnikov–Bekenstein black holes","authors":"Sardor Murodov,&nbsp;Ashfaque H. Bokhari,&nbsp;Javlon Rayimbaev,&nbsp;Bobomurat Ahmedov","doi":"10.1140/epjc/s10052-025-14298-4","DOIUrl":"10.1140/epjc/s10052-025-14298-4","url":null,"abstract":"<div><p>Testing gravity theories beyond General Relativity (GR) is crucial for a deeper understanding of fundamental physics, especially in the strong gravitational field regime around astrophysical compact objects. This work examines quasi-periodic oscillations (QPOs) generated by charged particles orbiting magnetized Bocharova–Bronnikov–Melnikov–Bekenstein (BBMB) black holes. We study charged particles’ circular orbits, deriving expressions for energy and angular momentum influenced by scalar and magnetic interactions, and investigate the innermost stable circular orbit (ISCO). Using the relativistic precession (RP) model, we derive the fundamental orbital, radial, and vertical frequencies of charged particle oscillations, highlighting deviations caused by conformal scalar and magnetic interactions. Our analysis shows that the conformally coupled scalar field significantly modifies the spacetime curvature, producing a repulsive gravitational effect that shifts stable orbits outward, thereby reducing the radial oscillation frequency. Using observational QPO data from well-known astrophysical sources-GRS 1915+105, GRO J1655-40, M82 X-1, and Sgr A*-we performed Markov Chain Monte Carlo (MCMC) simulations to constrain black hole mass, scalar coupling, magnetic interaction, and orbital radius parameters. Our results reveal significant deviations from standard General Relativity predictions, offering clear evidence of scalar and magnetic field influences. These findings indicate that scalar and magnetic fields produce observable shifts in QPO frequencies, providing promising observational signatures to test alternative gravitational theories in extreme astrophysical environments.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14298-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084959","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":"Measurement of the inclusive isolated-photon production cross section in pp and Pb–Pb collisions at (mathbf {sqrt{textit{s}_{NN }} = 5.02}) TeV","authors":"ALICE Collaboration","doi":"10.1140/epjc/s10052-025-13971-y","DOIUrl":"10.1140/epjc/s10052-025-13971-y","url":null,"abstract":"<div><p>The ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum (<span>(p_{textrm{T}}^{gamma })</span>), in Pb–Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of <span>(sqrt{s_{textrm{NN}}}~=~5.02)</span> TeV. The photon transverse momentum range is between 10–14 and 40–140 GeV/<span>(c)</span>, depending on the collision system and on the Pb–Pb centrality class. The result extends to lower <span>(p_{textrm{T}}^{gamma })</span> than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is <span>(|eta ^{gamma } | &lt;0.67)</span>. The isolation selection is based on a charged particle isolation momentum threshold <span>(p_{textrm{T}}^mathrm{iso,~ch} = 1.5)</span> GeV/<span>(c)</span> within a cone of radii <span>(R=0.2)</span> and 0.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb–Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z<span>(^{0})</span> bosons from the CMS experiment, which are all found to be in agreement.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13971-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091060","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":"AdS black strings in a cosmic web: geodesics, shadows, and thermodynamics","authors":"Faizuddin Ahmed,&nbsp;Ahmad Al-Badawi,&nbsp;İzzet Sakallı","doi":"10.1140/epjc/s10052-025-14266-y","DOIUrl":"10.1140/epjc/s10052-025-14266-y","url":null,"abstract":"<div><p>In a recent article (Deglmann et al. in Ann Phys (NY) 475:169948, 2025), the authors obtained a static, cylindrically symmetric Anti-de Sitter (AdS) black string (BS) solutions, which are cylindrical generalizations of black holes (BHs), surrounded by a cloud of strings (CS) and the quintessence field (QF), and discussed its properties. In the present study, we present a comprehensive analysis of cylindrically symmetric AdS BSs surrounded by CS and QF. Our analysis yields several significant results. We demonstrate that the presence of CS (parameter <span>(alpha )</span>) and QF (parameters <i>c</i> and <i>w</i>) reduces the radius of circular photon orbits (CPO) and BH shadow size, with measurements constrained by Event Horizon Telescope (EHT) observations of Sagittarius A*. We find that time-like particle orbits show increased energy with higher <span>(alpha )</span> and <i>c</i> values. We calculate that C-energy, representing gravitational energy within cylindrical radius, decreases with radial distance but exhibits distinct responses to CS and QF parameters. We observe that scalar perturbation potential increases <i>r</i> for specific <span>(alpha )</span> and <i>c</i> values, indicating stronger field-spacetime interactions away from the BS. We determine that Hawking temperature increases linearly with Schwarzschild radius, with parameter-dependent behavior varying based on QF state parameter <i>w</i>. These results demonstrate how CS and QF significantly modify the geodesic, perturbative, and thermodynamic properties of AdS BS, with potential observational implications for gravitational lensing, accretion disk dynamics, and BH evaporation signatures in future astronomical observations.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14266-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091059","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":"The effect of Lorentz symmetry violation on the hadron fragmentation function","authors":"S. Mohammad Moosavi Nejad,&nbsp;A. Yeganeh","doi":"10.1140/epjc/s10052-025-14291-x","DOIUrl":"10.1140/epjc/s10052-025-14291-x","url":null,"abstract":"<div><p>Different processes have been yet considered to investigate the effects of Lorentz symmetry violation and various bounds have been determined for the magnitude of Lorentz violation (LV) coefficients. In the present work we study, for the first time, the effect of Lorentz-violating terms on the fragmentation functions (FFs) of heavy mesons in two distinct cases correspondent to axial and vectorial nonminimal couplings in the theory of quantum chromodynamics (QCD). Our analytical results for heavy meson FFs in the framework of LV can be used to study the effect of Lorentz symmetry violation on hadron production processes in high energy colliders.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14291-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084960","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}