The European Physical Journal C最新文献

{"title":"Zee model in a modular (A_4) symmetry","authors":"Takaaki Nomura,&nbsp;Hiroshi Okada,&nbsp;Yong-hui Qi","doi":"10.1140/epjc/s10052-025-13864-0","DOIUrl":"10.1140/epjc/s10052-025-13864-0","url":null,"abstract":"<div><p>We study a Zee model applying a modular <span>(A_4)</span> symmetry in supersymmetry framework, where we construct our lepton model as minimum modular weight as possible. We show our predictions on phases and neutrino masses through numerical analysis. We find a model that can fit in both normal and inverted hierarchy cases of neutrino mass. The predictions of neutrino observables are shown where we obtain more constrained allowed region in the inverted hierarchy case.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13864-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108217","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":"Diagnosing emergent isotropy in anisotropic holographic systems using quantum information measures","authors":"Chong-Ye Chen,&nbsp;Mu-Jing Li,&nbsp;Zhe Yang,&nbsp;Da-Ming Jin,&nbsp;Peng Liu","doi":"10.1140/epjc/s10052-025-13797-8","DOIUrl":"10.1140/epjc/s10052-025-13797-8","url":null,"abstract":"<div><p>This study presents a comprehensive investigation of anisotropy in a holographic p-wave superconductor model, revealing novel insights into the behavior of quantum information in strongly coupled systems. Through rigorous semi-analytical methods, we uncover the existence of an isotropic point emerging at a critical temperature <span>(T_{II},)</span> marking a significant transition in the system’s anisotropic properties. We offer a systematic analysis of the mechanisms driving anisotropy and isotropy transitions, finding that this emergent isotropy point is unique to the p-wave model and absent in other anisotropic systems like anisotropic axion models with metal-insulator transitions. We propose that the explicit dependence of the vector field components in anisotropy is the key driver of the emergent isotropy. Our analysis of holographic entanglement entropy (HEE), entanglement wedge cross-section (EWCS), and butterfly velocity demonstrates their distinct sensitivities to bulk anisotropy. Among them, EWCS and butterfly velocity stand out as superior probes for detecting the isotropic point. Our findings provide a novel perspective on the interplay between unique emergent isotropic point and quantum information measures in strongly correlated systems.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13797-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108212","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":"Ultra high energy cosmic rays versus models of high energy hadronic interactions","authors":"Blaž Bortolato,&nbsp;Jernej F. Kamenik,&nbsp;Michele Tammaro","doi":"10.1140/epjc/s10052-025-13861-3","DOIUrl":"10.1140/epjc/s10052-025-13861-3","url":null,"abstract":"<div><p>We evaluate the consistency of hadronic interaction models in the CORSIKA simulation package with publicly available fluorescence telescope data from the Pierre Auger Observatory. By comparing the first few central moments of the extensive air shower depth maximum distributions, as extracted from measured events, to those predicted by the best-fit inferred compositions, we derive a statistical measure of the consistency of a given hadronic model with data. To mitigate possible systematic biases, we include all primaries up to iron, compensate for the differences between the measured and simulated energy spectra of cosmic rays and account for other known systematic effects. Additionally, we study the effects of including higher central moments in the fit and project our results to larger statistics.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13861-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108215","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":"Beyond the inert doublet: imprints of Scotogenic Yukawa interactions at FCC-ee","authors":"Carlo Marzo,&nbsp;Aurora Melis","doi":"10.1140/epjc/s10052-025-13802-0","DOIUrl":"10.1140/epjc/s10052-025-13802-0","url":null,"abstract":"<div><p>It is tempting to interpret the minuscule scale of neutrino masses as a symptom of its radiative origin. In light of the notable leap in precision expected at the Future Circular Collider, we explore areas of the parameter space that can simultaneously support the detectable Higgs-strahlung signal with parallel ones from forthcoming measurements in low-energy observables. We pinpoint the role that the extra fermions have in shaping a signal distinct from the pure Inert Doublet one. The details of the full one-loop computation and on-shell renormalization are presented. Both normal and inverted hierarchies for the radiatively generated neutrino masses and angles are investigated.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13802-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108275","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":"Radiative properties and QPOs around charged black hole in Kalb–Ramond gravity","authors":"Shokhzod Jumaniyozov,&nbsp;Muhammad Zahid,&nbsp;Mirzabek Alloqulov,&nbsp;Inomjon Ibragimov,&nbsp;Javlon Rayimbaev,&nbsp;Sardor Murodov","doi":"10.1140/epjc/s10052-025-13863-1","DOIUrl":"10.1140/epjc/s10052-025-13863-1","url":null,"abstract":"<div><p>Studies of accretion disc luminosities and quasiperiodic oscillations around black holes may help us understand the gravitational properties of black hole spacetime. This work is devoted to studying the radiation properties of the accretion disk around the black holes in Kalb–Ramond gravity. We investigate the event horizon of the black hole spacetime and calculate the effective gravitational mass of the spacetime. Also, we analyze the circular motion of test particles in the black hole spacetime. The effects of the black hole charge and KR parameters on the particles’ effective mass, energy, and angular momentum at circular orbits and innermost stable circular orbits are studied. The frequency of Keplerian orbits and the radial and vertical oscillations of the particles along stable orbits are calculated and applied to analyze the existence of QPO in relativistic precession, warped disc, and epicyclic resonance models. QPO orbits’ locations with ratios of upper and lower frequencies of twin-peaked QPOs 3:2, 4:3, and 5:4 are analyzed compared to ISCO. We also obtain constrain values for the black hole mass, charge, KR field parameter, and QPO orbits found using Markovian chain Monte Carlo (MCMC) simulations for stellar mass (XTE J1550, GRS 1915+105), intermediate mass (M82-X1), and supermassive black holes (Sgr A*). Finally, we explore the radiative properties of the accretion disk around the charged black hole in KR gravity, such as the total radiation flux, accretion disc temperature, and differential luminosity.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13863-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108277","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 stability of anisotropic compact stars influenced by dark matter under teleparallel gravity: an extended gravitational deformation approach","authors":"Sneha Pradhan,&nbsp;Piyali Bhar,&nbsp;Sanjay Mandal,&nbsp;P. K. Sahoo,&nbsp;Kazuharu Bamba","doi":"10.1140/epjc/s10052-025-13849-z","DOIUrl":"10.1140/epjc/s10052-025-13849-z","url":null,"abstract":"<div><p>In our investigation, we pioneer the development of geometrically deformed strange stars within the framework of teleparallel gravity theory through gravitational decoupling via the complete geometric deformation (CGD) technique. The significant finding is the precise solution for deformed strange star (SS) models achieved through the vanishing complexity factor scenario. Further, we introduce the concept of space-time deformation caused by dark matter (DM) content in DM haloes, leading to perturbations in the metric potentials <span>(g_{tt})</span> and <span>(g_{rr})</span> components. Mathematically, this DM-induced deformation is achieved through the CGD method, where the decoupling parameter <span>(alpha )</span> governs the extent of DM influence. To validate our findings, we compare our model predictions with observational constraints, including GW190814 (with a mass range of <span>(2.5-2.67 M_{odot })</span>) and neutron stars (NSTRs) such as EXO 1785-248 [mass=<span>(1.3_{-0.2}^{+0.2}~M_{odot })</span>], 4U 1608-52 [mass=<span>(1.74_{-0.14}^{+0.14}~M_{odot })</span>], and PSR J0952-0607 [mass=<span>(2.35_{-0.17}^{+0.17}~M_{odot })</span>]. Our investigation delves into the stability of the model by considering causality conditions, Herrera’s cracking method, the adiabatic index, and the Harrison–Zeldovich–Novikov criterion. We demonstrate that the developed model mimics a wide range of recently observed pulsars. To emphasize its compatibility, we highlight the predicted mass and radius in tabular form by varying both the parameters <span>(alpha )</span> and <span>(zeta _1)</span>. Notably, our findings are consistent with the observation of gravitational waves from the first binary merger event. Furthermore, we compare our results with those obtained for a slow-rotating configuration. In addition to this, we discuss the moment of inertia using the Bejger–Haensel approach in this formulation.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13849-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108276","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":"Theoretical study of the open-flavored tetraquark (T_{cbar{s}}(2900)) in the process (Lambda _brightarrow K^0D^0Lambda )","authors":"Wen-Tao Lyu,&nbsp;Yun-He Lyu,&nbsp;Man-Yu Duan,&nbsp;Guan-Ying Wang,&nbsp;Dian-Yong Chen,&nbsp;En Wang","doi":"10.1140/epjc/s10052-025-13805-x","DOIUrl":"10.1140/epjc/s10052-025-13805-x","url":null,"abstract":"<div><p>Recently, the LHCb Collaboration has measured the processes <span>(B^+rightarrow D^-D_s^+pi ^+)</span> and <span>(B^+rightarrow bar{D}^0D_s^+pi ^+)</span>, where the <span>(D_s^+pi ^-)</span> and <span>(D_s^+pi ^+)</span> invariant mass distributions show the significant signals of two new open-flavored tetraquark states <span>(T_{cbar{s}}(2900)^0)</span> and <span>(T_{cbar{s}}(2900)^{++})</span>, as the two of the isospin triplet. In this work, we have investigated the process <span>(Lambda _brightarrow K^0D^0Lambda )</span> by taking into account the tetraquark state <span>(T_{cbar{s}}(2900)^0)</span> and the intermediate nucleon resonance <span>(N^*(1535))</span>, which could be dynamically generated by the interactions of the <span>(D^*K^*/D^*_srho )</span> and the pseudoscalar meson-octet baryon, respectively. Our results show that a clear peak of the open-flavored tetraquark <span>(T_{cbar{s}}(2900))</span> may appear in the <span>(K^0D^0)</span> invariant mass distribution of the process <span>(Lambda _brightarrow K^0D^0Lambda )</span>, which could be tested by future experiments.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13805-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107995","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":"Exhibiting stable model of dark energy compact star with Tolman-VI solution under complexity free system","authors":"Hammad Nazar,&nbsp;Abdul Majeed,&nbsp;Ghulam Abbas,&nbsp;Asifa Ashraf,&nbsp;Phongpichit Channuie","doi":"10.1140/epjc/s10052-025-13854-2","DOIUrl":"10.1140/epjc/s10052-025-13854-2","url":null,"abstract":"<div><p>Several recent developments have highlighted the significance of the vanishing complexity factor formalism in understanding the structure and evolution of stellar relativistic compact objects. This formalism, introduced through a novel definition proposed by Herrera (Phys. Rev. D 97:044010, 2018), offers valuable insights into the dynamics of such systems. In this manuscript, we explored a class of realistic solutions to the static and spherically symmetric field equations characterized by two fluid distributions: ordinary stellar matter and dark energy, within the framework of this formalism. Utilizing the well-known Tolman-<i>VI</i> solution as the seed ansatz for the metric coefficient <span>(g_{rr},)</span> we employed the complexity-free format to derive an analytic solution for the other metric coefficient, <span>(g_{tt}.)</span> Subsequently, we obtained the solutions of gravitational field equations for our proposed spacetime model by incorporating the linear dark energy equation of state. These results were applied to the astrophysical compact star candidate <i>LMC</i> <i>X</i>-4,  with <span>(M =1.04 M_odot )</span> and <span>(R =8.4~text {km}.)</span> The potential viability and credibility of the proposed dark star solutions were thoroughly analyzed by examining key constraints, including the regularity of metric functions, physical adequacy through matter variables, state parameter behavior, energy conditions, stability tests (such as pressure anisotropy and hydrostatic equilibrium), the speed of sound, and the mass–radius relation for this compact star candidate. Notably, the estimated values of the dark energy coupling factor, presented in Table 1, highlight the exotic nature of the fluid distribution and effectively quantify the contribution of dark energy to the structure and evolution of an ultra-relativistic dark compact star. These findings strongly support our model solutions and demonstrate improvements over previously reported results in Rej et al. (Chin J Phys 87:608, 2024).</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13854-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108122","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":"A comparison of Bayesian and frequentist confidence intervals in the presence of a late Universe degeneracy","authors":"Eoin Ó. Colgáin,&nbsp;Saeed Pourojaghi,&nbsp;M. M. Sheikh-Jabbari,&nbsp;Darragh Sherwin","doi":"10.1140/epjc/s10052-024-13727-0","DOIUrl":"10.1140/epjc/s10052-024-13727-0","url":null,"abstract":"<div><p>Hubble tension is a problem in one-dimensional (1D) posteriors, since local <span>(H_0)</span> determinations are only sensitive to a single parameter. Projected 1D posteriors for <span>(Lambda )</span>CDM cosmological parameters become more non-Gaussian with increasing effective redshift when the model is fitted to redshift-binned data in the late Universe. We explain mathematically why this non-Gaussianity arises and show, using observational Hubble data (OHD), that Markov chain Monte Carlo (MCMC) marginalisation leads to 1D posteriors that fail to track the <span>(chi ^2)</span> minimum at <span>(68%)</span> confidence level in high redshift bins. To gain a second perspective, we resort to profile likelihoods as a complementary technique. Doing so, we observe that <span>(z gtrsim 1)</span> cosmic chronometer (CC) data currently prefer a non-evolving (constant) Hubble parameter over a Planck-<span>(Lambda )</span>CDM cosmology at <span>(sim 2 sigma )</span>. Within the Hubble tension debate, it is imperative that subsamples of data sets with differing redshifts yield similar <span>(H_0)</span> values. In addition, we confirm that MCMC degeneracies observed in 2D posteriors are not due to curves of constant <span>(chi ^2)</span>. Finally, on the assumption that the Planck-<span>(Lambda )</span>CDM cosmological model is correct, using profile likelihoods we confirm a <span>(&gt;2 sigma )</span> discrepancy with Planck-<span>(Lambda )</span>CDM in a combination of CC and baryon acoustic oscillations (BAO) data beyond <span>(z sim 1.5)</span>. This confirms a discrepancy reported earlier with fresh methodology.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13727-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108121","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":"A model of inflation consistent with Planck 2018 and BICEP/Keck data","authors":"Li-Yang Chen,&nbsp;Hongwei Yu,&nbsp;Puxun Wu","doi":"10.1140/epjc/s10052-024-13728-z","DOIUrl":"10.1140/epjc/s10052-024-13728-z","url":null,"abstract":"<div><p>We establish a phenomenological inflation model in this paper and find that the predicted values of the spectral index and the tensor-to-scalar ratio are well consistent with the results from the Planck 2018 survey and the BICEP/Keck array measurement, significantly improving the theoretical precision in describing the early universe’s inflationary process. After inflation, we find that preheating can occur from the tachyonic instability or the parametric resonance, which depends on the value of one of model parameters.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13728-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109947","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}