The European Physical Journal C最新文献

{"title":"Detecting dilute axion stars constrained by fast radio bursts in the Solar System via stimulated decay","authors":"Haoran Di,&nbsp;Zhu Yi,&nbsp;Haihao Shi,&nbsp;Yungui Gong","doi":"10.1140/epjc/s10052-025-14270-2","DOIUrl":"10.1140/epjc/s10052-025-14270-2","url":null,"abstract":"<div><p>Fast radio bursts (FRBs) can be explained by collapsing axion stars, imposing constraints on the axion parameter space and providing valuable guidance for experimental axion searches. In the traditional post-inflationary model, axion stars could constitute up to <span>(75%)</span> of the dark matter component, suggesting that some axion stars may exist within the Solar System. Photons with energy half the axion mass can stimulate axion decay. Thus, directing a powerful radio beam at an axion star could trigger its stimulated decay, producing a detectable echo. Using this method, we find it is possible to test the existence of dilute axion stars with maximum masses ranging from <span>(6.21times 10^{-12}M_odot )</span> to <span>(2.61times 10^{-10}M_odot )</span>, as constrained by FRBs, within the Solar System. The resulting echo from axion stars constrained by FRBs could be detectable by terrestrial telescopes. Detecting such an echo would confirm the existence of axion stars, unravel the mystery of dark matter, and provide key evidence that some FRBs originate from collapsing axion stars. Furthermore, FRBs produced by axion star collapses could serve as standard candles, aiding in the resolution of the Hubble tension. If no echo is detected using this method, it would place constraints on the abundance of dark matter in the form of dilute axion stars with maximum masses in the range of <span>(6.21times 10^{-12}M_odot )</span> to <span>(2.61times 10^{-10}M_odot )</span>.\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/s10052-025-14270-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144091061","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":"On the determination of the interaction time of GeV neutrinos in large argon gas TPCs","authors":"A. Saá-Hernández,&nbsp;D. González-Díaz,&nbsp;J. Martín-Albo,&nbsp;M. Tuzi,&nbsp;P. Amedo,&nbsp;J. Baldonedo,&nbsp;C. Benítez,&nbsp;S. Bounasser,&nbsp;E. Casarejos,&nbsp;J. Collazo,&nbsp;A. Fernández-Prieto,&nbsp;D. J. Fernández-Posada,&nbsp;R. Hafeji,&nbsp;S. Leardini,&nbsp;D. Rodas-Rodríguez,&nbsp;A. L. Saborido,&nbsp;A. Segade,&nbsp;A. Slater","doi":"10.1140/epjc/s10052-025-14248-0","DOIUrl":"10.1140/epjc/s10052-025-14248-0","url":null,"abstract":"<div><p>Next-generation megawatt-scale neutrino beams open the way to studying neutrino-nucleus scattering using gaseous targets for the first time. This represents an opportunity to improve the knowledge of neutrino cross sections in the energy region between hundreds of MeV and a few GeV, of interest for the upcoming generation of long-baseline neutrino oscillation experiments. The challenge is to accurately track and (especially) time the particles produced in neutrino interactions in large and seamless volumes down to few-MeV energies. We propose to accomplish this through an optically-read time projection chamber (TPC) filled with high-pressure argon and equipped with both tracking and timing functions. In this work, we present a detailed study of the time-tagging capabilities of such a device, based on end-to-end optical simulations that include the effect of photon propagation, photosensor response, dark count rate and pulse reconstruction. We show that the neutrino interaction time can be reconstructed from the primary scintillation signal with a precision in the range of 1–2.5 ns <span>((sigma ))</span> for point-like deposits with energies down to 5 MeV. A similar response is observed for minimum-ionizing particle tracks extending over lengths of a few meters. A discussion on previous limitations towards such a detection technology, and how they can be realistically overcome in the near future thanks to recent developments in the field, is presented. The performance demonstrated in our analysis seems to be well within reach of next-generation neutrino-oscillation experiments, through the instrumentation of the proposed TPC with conventional reflective materials and a silicon photomultiplier array behind a transparent cathode.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14248-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084886","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":"Searching for gluino LSP at the LHC","authors":"Paulina Knees,&nbsp;Essodjolo Kpatcha,&nbsp;Iñaki Lara,&nbsp;Daniel E. López-Fogliani,&nbsp;Carlos Muñoz,&nbsp;Natsumi Nagata,&nbsp;Hidetoshi Otono","doi":"10.1140/epjc/s10052-025-14199-6","DOIUrl":"10.1140/epjc/s10052-025-14199-6","url":null,"abstract":"<div><p>We analyse relevant signals expected at the LHC, assuming that the gluino is the lightest supersymmetric particle (LSP) in the framework of the <span>(mu nu )</span>SSM. In this <i>R</i>-parity violating model, the presence of couplings involving right-handed neutrinos solves simultaneously the <span>(mu )</span> problem and the accommodations of neutrino masses and mixing angles. We study gluino pair production in quark-antiquark and gluon-gluon collisions. The main decay channels for the gluino LSP are the three-body decays to two quarks and a lepton or a neutrino. In both cases, the leading channels occur for the third family of quarks. We compare the predictions of this scenario with LHC searches for prompt and long-lived particles. To analyse the parameter space we sample the <span>(mu nu )</span>SSM for a gluino LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Our results imply a lower limit on the mass of the gluino LSP of about 2600 GeV, and an upper limit for the decay length of about 6 cm.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14199-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074102","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":"Returning back to Mukhanov parametrization of inflationary equation of state","authors":"Barun Kumar Pal","doi":"10.1140/epjc/s10052-025-14259-x","DOIUrl":"10.1140/epjc/s10052-025-14259-x","url":null,"abstract":"<div><p>We have re-examined Mukhanov parametrization for inflationary equation of state, <span>(1+omega =frac{beta }{({N}+1)^alpha })</span>, in the light of Planck 2018 results and latest bound of tensor-to-scalar ratio employing Hamilton–Jacobi formalism. We have found that the current observational values of scalar spectral index and tensor-to-scalar ratio can be used efficiently to constrain the model parameters. The recent bound of <span>(r&lt;0.032)</span> has been used to put an upper bound on one of the model parameter. Whereas 1-<span>(sigma )</span> bound of the scalar spectral index <span>(0.9607le n_{_S}le 0.9691)</span> along with the upper bound of tensor-to-scalar ratio provided restriction on the other model parameter <span>(1.50&lt;alpha le 2.20)</span>. These bounds however depend on the number of e-foldings still left before the end of inflation and whenever <span>(1.50&lt;alpha le 2.20)</span> we can find appropriate values of the other model parameter <span>(beta )</span> so that the observational predictions are in tune with the latest available inflationary observables. We have further utilized the predictions from forthcoming CMB missions in the likes of CMB-S4 and LiteBIRD in order to obtain bounds on the model parameters. We find that detection of gravity waves would help us constrain the model parameters further. But in the absence of detection of primordial gravity wave signal by these CMB missions may rule out Mukhanov parametrization.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14259-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074008","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 event KM3-230213A constraints on Lorentz Invariance Violation in neutrino sector","authors":"Petr Satunin","doi":"10.1140/epjc/s10052-025-14240-8","DOIUrl":"10.1140/epjc/s10052-025-14240-8","url":null,"abstract":"<div><p>We discuss the constraints on superluminal neutrino Lorentz Invariance Violation (LIV) parameters from the observation of the ultra-high-energy event KM3-230213A by the KM3NeT collaboration in cases of linear <span>(n=1)</span> and quadratic <span>(n=2)</span> LIV scenarios. Assuming extragalactic origin of the event, we obtain the constraints on LIV mass scale <span>(Lambda _{n=1} = 1.1 times 10^{30}, text{ GeV })</span> and <span>(Lambda _{n=2} = 1.1 times 10^{19}, text{ GeV })</span> from the absence of neutrino splitting.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14240-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073701","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":"Polarized image of an equatorial emitting ring around a rotating braneworld black hole","authors":"Xin Qin,&nbsp;Songbai Chen,&nbsp;Xiangyun Fu,&nbsp;Yang Huang,&nbsp;Jiliang Jing","doi":"10.1140/epjc/s10052-025-14285-9","DOIUrl":"10.1140/epjc/s10052-025-14285-9","url":null,"abstract":"<div><p>We have studied the polarized image of an equatorial emitting ring around a rotating braneworld black hole. This black hole possesses a tidal charge parameter <i>b</i>, which describes the effects of the free gravitational field in the bulk on the brane. Results show that the effects of the tidal charge parameter on the polarized image depend on the magnetic field structure, the observer inclination, the velocity of the fluid and the radii of the emitting ring. For a given value of the rotation parameter, the observed polarization intensity increases monotonously with <i>b</i> when the magnetic field lies in the equatorial plane, while it no longer changes monotonically with <i>b</i> when the magnetic field is perpendicular to the equatorial plane. The effect of parameter <i>b</i> on polarized images is similar in both stronger and weaker gravitational fields when the magnetic field is within the equatorial plane, and the differences in polarization vectors for different <i>b</i> become noticeable in stronger gravitational fields. We also probe the effects of <i>b</i> on the Stokes Q-U loops.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14285-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074007","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":"Three-loop verification of the equations relating running of the gauge couplings in (mathcal{N}=1) SQCD + SQED","authors":"O. V. Haneychuk,&nbsp;K. V. Stepanyantz","doi":"10.1140/epjc/s10052-025-14250-6","DOIUrl":"10.1140/epjc/s10052-025-14250-6","url":null,"abstract":"<div><p>We verify a recently derived equations relating the renormalization group running of two gauge couplings in <span>(mathcal{N}=1)</span> SQCD + SQED by the explicit three-loop calculation. It is demonstrated that these equations are really valid in the HD + MSL scheme. In other words, if a theory is regularized by higher covariant derivatives and the renormalization is made by minimal subtractions of logarithms, the analogs of the strong and electromagnetic gauge couplings do not run independently. However, in the <span>(overline{text{ DR }})</span> scheme the considered equations do not hold starting from the three-loop order, where the scheme dependence becomes essential. Therefore, they are valid only for a certain set of the renormalization prescriptions. We prove that all of them can be obtained from the HD + MSL scheme by finite renormalizations which satisfy a special constraint and illustrate how this works in the three-loop approximation.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14250-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074082","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":"Generation of quantum entanglement in superposed diamond spacetime","authors":"Xiaofang Liu,&nbsp;Changjing Zeng,&nbsp;Jieci Wang","doi":"10.1140/epjc/s10052-025-14251-5","DOIUrl":"10.1140/epjc/s10052-025-14251-5","url":null,"abstract":"<div><p>A comprehensive study integrating the microscopic structure of spacetime and the principle of quantum superposition is capable of offering a fundamental bottom-up approach for understanding the quantum aspect of gravity. In this paper, we present a framework for the superposition of spacetime structures in the causal diamond spacetime and analyze the behavior of quantum entanglement generated by spacetime superposition from the perspective of relativistic quantum information. For the first time, we combine the concept of spacetime superposition with causal diamonds and derive the analytical expression of the Unruh-diamond vacuum state for Dirac fields in the causal diamond spacetime. Based on this, we analyze both initially correlated and uncorrelated modes in superposed and classical causal diamond spacetimes, and quantifying how quantum thermal effects arising from spacetime structure alter entanglement. Our findings reveal that quantum entanglement degrades in classical diamond spacetime, while the superposed structure generates additional entanglement resources between modes in superposed diamond spacetimes. From a quantum information perspective, our results suggest that the characteristics of spacetime structural manifestations can serve as valuable resources for performing quantum information processing tasks.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14251-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949476","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":"RG-stable parameter relations of a scalar field theory in absence of a symmetry","authors":"Howard E. Haber,&nbsp;P. M. Ferreira","doi":"10.1140/epjc/s10052-025-14148-3","DOIUrl":"10.1140/epjc/s10052-025-14148-3","url":null,"abstract":"<div><p>The stability of tree-level relations among the parameters of a quantum field theory with respect to renormalization group (RG) running is typically explained by the existence of a symmetry. We examine a toy model of a quantum field theory of two real scalars in which a tree-level relation among the squared-mass parameters of the scalar potential appears to be RG-stable without the presence of an appropriate underlying symmetry. The stability of this relation with respect to renormalization group running can be explained by complexifying the original scalar field theory. It is then possible to exhibit a symmetry that guarantees the relations of relevant beta functions of squared-mass parameters of the complexified theory. Among these relations, we can identify equations that are algebraically identical to the corresponding equations that guarantee the stability of the relations among the squared-mass parameters of the original real scalar field theory where the symmetry of the complexified theory is no longer present.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14148-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074001","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":"Boson stars and their frozen states in an infinite tower of higher-derivative gravity","authors":"Tian-Xiang Ma,&nbsp;Tie-Feng Fang,&nbsp;Yong-Qiang Wang","doi":"10.1140/epjc/s10052-025-14252-4","DOIUrl":"10.1140/epjc/s10052-025-14252-4","url":null,"abstract":"<div><p>In this paper, we present a solution for a five-dimensional boson star under gravity with infinite tower of higher-curvature corrections. We discover that when the coupling constant exceeds a certain threshold, an alternative configuration emerges, distinct from the conventional five-dimensional boson star. This new structure is characterized by a broader frequency range, with a minimum value approaching zero. At a truncation of second-derivative correction term, the solution and its scalar curvature diverge as the frequency approaches zero. However, as the order of higher-curvature corrections increases, the singularity at the center vanishes, resulting in a globally regular solution. Additionally, as the frequency approaches zero, the scalar field’s radial distribution becomes concentrated within the critical radius <span>(r_c)</span>, forming what we term a “frozen star”. Beyond this radius, the metric of the frozen star almost degenerates into that of an extreme black hole. The solutions for such frozen stars offer a new avenue for exploring the mysterious interiors of compact objects, enhancing our understanding of the internal structure of black holes under semi-classical conditions and potentially addressing the series of paradoxes associated with information loss due to singularities and horizons.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14252-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074069","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}