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

The constraint on modified black holes with extreme mass ratio inspirals 对具有极端质量比吸气的修正黑洞的约束

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-04 DOI: 10.1140/epjc/s10052-025-14100-5

Chao Zhang, Guoyang Fu, Yungui Gong

{"title":"The constraint on modified black holes with extreme mass ratio inspirals","authors":"Chao Zhang, Guoyang Fu, Yungui Gong","doi":"10.1140/epjc/s10052-025-14100-5","DOIUrl":"10.1140/epjc/s10052-025-14100-5","url":null,"abstract":"<div><p>The low-energy effective action of String Theory introduces corrections to the dilaton-graviton sector, resulting in deformed black holes beyond general relativity. We analyze extreme mass-ratio inspiral systems (EMRIs), where a stellar-mass object spirals into a slowly rotating supermassive black hole including a distinct deviation parameter. This study examines the effects of this deformation on the rate of change of orbital energy and angular momentum, orbital evolution, and phase dynamics, incorporating leading-order post-Newtonian corrections. The String theory parameter <span>(alpha )</span> will accelerate the EMRI merger because of the extra energy and angular momentum fluxes carried away by corrections to the dilaton-graviton sector. With 1-year observations of EMRIs, we employ the Fisher information matrix method to evaluate the potential for detecting deviations from general relativity through space-based gravitational wave detectors that utilize time-delay interferometry to suppress laser noise. The constraint on modified black holes, <span>(varDelta alpha preceq 10^{-5})</span>, is almost the same with and without the time-delay interferometry combination. This analysis enhances our understanding and underscores the crucial role of observations in advancing gravitational phenomena within String Theory.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14100-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778113","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

Effective temperatures of the QGP from thermal photon and dilepton production 热光子和二轻子产生的 QGP 有效温度

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-04 DOI: 10.1140/epjc/s10052-025-14072-6

Olaf Massen, Govert Nijs, Mike Sas, Wilke van der Schee, Raimond Snellings

{"title":"Effective temperatures of the QGP from thermal photon and dilepton production","authors":"Olaf Massen, Govert Nijs, Mike Sas, Wilke van der Schee, Raimond Snellings","doi":"10.1140/epjc/s10052-025-14072-6","DOIUrl":"10.1140/epjc/s10052-025-14072-6","url":null,"abstract":"<div><p>Thermal electromagnetic radiation is emitted by the quark-gluon plasma (QGP) throughout its space-time evolution, with production rates that depend characteristically on the temperature. We study this temperature using thermal photons and dileptons using the <i>Trajectum</i> heavy ion code, which is constrained by Bayesian analysis. In addition we present the elliptic flow of both the thermal photons and thermal dileptons including systematic uncertainties corresponding to the model parameter uncertainty. We give a comprehensive overview of the resulting effective temperatures <span>(T_{textrm{eff}},)</span> obtained from thermal photon transverse momentum and thermal dilepton invariant mass distributions, as well as the dependence of <span>(T_{textrm{eff}})</span> on various selection criteria of these probes. We conclude that the <span>(T_{textrm{eff}})</span> obtained from thermal photons is mostly insensitive to the temperature of the QGP with a value of <span>(T_{textrm{eff}} sim 250)</span>–300 MeV depending on their transverse momentum, almost independent of collision centrality. Thermal dileptons are much better probes of the QGP temperature as they do not suffer from a blue shift as their invariant mass is used, allowing for a more precise constraint of the QGP temperature during different stages of the evolution of the system. By applying selection criteria on the dilepton transverse momentum and the invariant mass we are able to extract fluid temperatures on average times ranging from late emission <span>((langle tau rangle = 5.6~text {fm}/c))</span> to very early emissions <span>((langle tau rangle < 1.0~text {fm}/c).)</span> Furthermore, we show how these selection criteria can be used to map the elliptic flow of the system all throughout its evolution.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14072-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778090","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

Measuring the ATLAS ITk pixel detector material via multiple scattering of positrons at the CERN PS 在CERN PS上通过正电子的多次散射测量ATLAS ITk像素探测器材料

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-03 DOI: 10.1140/epjc/s10052-025-14092-2

Simon Florian Koch, Brian Moser, Antonín Lindner, Valerio Dao, Ignacio Asensi, Daniela Bortoletto, Marianne Brekkum, Florian Dachs, Hans Ludwig Joos, Milou van Rijnbach, Abhishek Sharma, Ismet Siral, Carlos Solans, Yingjie Wei

{"title":"Measuring the ATLAS ITk pixel detector material via multiple scattering of positrons at the CERN PS","authors":"Simon Florian Koch, Brian Moser, Antonín Lindner, Valerio Dao, Ignacio Asensi, Daniela Bortoletto, Marianne Brekkum, Florian Dachs, Hans Ludwig Joos, Milou van Rijnbach, Abhishek Sharma, Ismet Siral, Carlos Solans, Yingjie Wei","doi":"10.1140/epjc/s10052-025-14092-2","DOIUrl":"10.1140/epjc/s10052-025-14092-2","url":null,"abstract":"<div><p>The ITk is a new silicon tracker for the ATLAS experiment designed to increase detector resolution, readout capacity, and radiation hardness, in preparation for the larger number of simultaneous proton–proton interactions at the High Luminosity LHC. This paper presents the first direct measurement of the material budget of an ATLAS ITk pixel module, performed at a testbeam at the CERN Proton Synchrotron via the multiple scattering of low energy positrons within the module volume. Using a four plane telescope of thin monolithic pixel detectors from the MALTA Collaboration, scattering datasets were recorded at a beam energy of <span>(1.2,text {GeV})</span>. Kink angle distributions were extracted from tracks derived with and without information from the ITk pixel module, and were fit to extract the RMS scattering angle, which was converted to a fractional radiation length <span>(x/X_0)</span>. The average <span>(x/X_0)</span> across the module was measured as <span>([0.89 pm 0.01 text { (resolution)} pm 0.01 text { (subtraction)} ,,pm ,, 0.08 text {~(beam momentum band)}]%)</span>, which agrees within uncertainties with an estimate of <span>(0.88%)</span> derived from material component expectations.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14092-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769869","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

Topological constraints on general relativistic galaxy modelling 广义相对论星系模型的拓扑约束

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-03 DOI: 10.1140/epjc/s10052-025-14098-w

Marco Galoppo

引用次数: 0

Scalar NSI: a unique tool for constraining absolute neutrino masses via neutrino oscillations 标量NSI：通过中微子振荡约束中微子绝对质量的独特工具

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-03 DOI: 10.1140/epjc/s10052-025-14089-x

Abinash Medhi, Arnab Sarker, Moon Moon Devi

{"title":"Scalar NSI: a unique tool for constraining absolute neutrino masses via neutrino oscillations","authors":"Abinash Medhi, Arnab Sarker, Moon Moon Devi","doi":"10.1140/epjc/s10052-025-14089-x","DOIUrl":"10.1140/epjc/s10052-025-14089-x","url":null,"abstract":"<div><p>In the standard interaction scenario, a direct measurement of absolute neutrino masses via neutrino oscillations is not feasible, as the oscillations depend only on the mass-squared differences. However,scalar non-standard interactions (SNSI) can introduce sub-dominant terms in the neutrino oscillation Hamiltonian that can directly affect the neutrino mass matrix, thereby making SNSI a unique tool for neutrino mass measurements. In this work, for the first time, we constrain the absolute masses of neutrinos by probing SNSI in a neutrino oscillation experiment. We show that a bound on the neutrino mass can be induced in the presence of SNSI at DUNE. We note that the constraints on the neutrino mass are much better for <span>(eta _{mu mu })</span> and <span>(eta _{tau tau })</span> as compared to <span>(eta _{ee})</span> for both NO and IO scenarios. We have also explored the constraints on the neutrino mass for different choices of <span>(delta _{CP})</span> and <span>(theta _{23})</span> for both neutrino mass orderings. This study shows that SNSI can serve as an interesting avenue to constrain the absolute neutrino masses in long-baseline neutrino experiments via neutrino oscillations.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14089-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769870","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

Particles dynamics with QPOs and thermodynamics features around a deformed anti-de sitter Schwarzschild black hole 变形反德西特史瓦西黑洞周围具有QPOs的粒子动力学和热力学特征

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-03 DOI: 10.1140/epjc/s10052-025-14081-5

Asifa Ashraf, Allah Ditta, Abdelmalek Bouzenada, Muhammad Aslam, Phongpichit Channuie, Farruh Atamurotov, M. Y. Malik

{"title":"Particles dynamics with QPOs and thermodynamics features around a deformed anti-de sitter Schwarzschild black hole","authors":"Asifa Ashraf, Allah Ditta, Abdelmalek Bouzenada, Muhammad Aslam, Phongpichit Channuie, Farruh Atamurotov, M. Y. Malik","doi":"10.1140/epjc/s10052-025-14081-5","DOIUrl":"10.1140/epjc/s10052-025-14081-5","url":null,"abstract":"<div><p>We explore the dynamics of test particles around a deformed anti-de Sitter Schwarzschild black hole and analyze the influence of model parameters on particle motion. Using the effective potential technique, we examine the stability of equatorial circular orbits. We obtain the analytical expressions for the energy and angular momentum of test particles, along with the innermost stable circular orbits and the effective forces acting upon the test particles. We also probe the epicyclic oscillations of test particles close to the equatorial plane and further evaluate analytical expressions for radial, vertical, and orbital frequencies, including the periastron precession frequency. Additionally, we study the thermal characteristics of the black hole, investigating its Gibbs free energy, emission energy, and check the influence of other thermodynamic properties on the black hole model. Our findings indicate that the model parameters <i>M</i>, <span>( Lambda )</span>, <span>( alpha )</span> and <span>( beta )</span> considerably affect both the particle motion including epicyclic oscillations and the thermodynamic behavior.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14081-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769872","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

Detect anomalous quartic gauge couplings at muon colliders with quantum kernel k-means 用量子核k-均值探测介子对撞机的反常四次规范耦合

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14069-1

Shuai Zhang, Ke-Xin Chen, Ji-Chong Yang

{"title":"Detect anomalous quartic gauge couplings at muon colliders with quantum kernel k-means","authors":"Shuai Zhang, Ke-Xin Chen, Ji-Chong Yang","doi":"10.1140/epjc/s10052-025-14069-1","DOIUrl":"10.1140/epjc/s10052-025-14069-1","url":null,"abstract":"<div><p>In recent years, with the increasing luminosities of colliders, handling the growing amount of data has become a major challenge for future New Physics (NP) phenomenological research. In order to improve efficiency, machine learning algorithms have been introduced into the field of high-energy physics. As a machine learning algorithm, kernel k-means has been demonstrated to be useful for searching NP signals. It is well known that the kernel k-means algorithm can be carried out with the help of quantum computing, which suggests that quantum kernel k-means (QKKM) is also a potential tool for NP phenomenological studies in the future. This paper investigates how to search for NP signals using QKKM. Taking the <span>(mu ^+mu ^-rightarrow nu {bar{nu }}gamma gamma )</span> process at a muon collider as an example, the dimension-8 operators contributing to anomalous quartic gauge couplings (aQGCs) are studied. The expected coefficient constraints obtained using the QKKM of three different forms of quantum kernels, as well as the constraints obtained by the classical k-means algorithm are presented, and it can be shown that QKKM can help to find the signal of aQGCs. Comparing the classical k-means anomaly detection algorithm with QKKM, it is indicated that the QKKM is able to archive a better cut efficiency.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14069-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761813","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

Gravitational Faraday holonomy 引力法拉第全息

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14086-0

Blake A. Parvin, Mark T. Lusk

引用次数: 0

Some simple theories of gravity with propagating nonmetricity 具有传播非规性的一些简单引力理论

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14036-w

Yusuke Mikura, Roberto Percacci

引用次数: 0

Nonmetricity-based hybrid self-gravitating compact stars with embedded class-one symmetry 嵌入一类对称的基于非对称性的混合自引力致密星

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-04-02 DOI: 10.1140/epjc/s10052-025-14102-3

Naveed Iqbal, S. Khan, Mohammad Alshammari, Wael W. Mohammed, M. Ilyas

{"title":"Nonmetricity-based hybrid self-gravitating compact stars with embedded class-one symmetry","authors":"Naveed Iqbal, S. Khan, Mohammad Alshammari, Wael W. Mohammed, M. Ilyas","doi":"10.1140/epjc/s10052-025-14102-3","DOIUrl":"10.1140/epjc/s10052-025-14102-3","url":null,"abstract":"<div><p>This work aims to explore the novel characteristics of a static hybrid transitional star with a spherical distribution of relativistic matter under the embedded class one metric framework. This theoretical stellar model is derived using the nonmetricity-inspired <span>(f(mathbb {Q}))</span> gravity, featuring a core-crust structure: a strange matter core embedded in a normal matter crust. Our model incorporates pressure anisotropy as an intrinsic characteristic of highly compact strange stars, a feature expected to arise in the super-dense regime. The equation of state, in its basic form, using the MIT bag model is employed to represent correlation between pressure and density in quark matter inside the star’s core. The development of this model involves selecting the temporal gravitational potential based on the Tolman–Kuchowicz ansatz, while the radial gravitational potential is determined using the Class One embedding formalism. We employed both analytical and graphical methods to assess the robustness and equilibrium of the presented stellar solution. We provide an in-depth description of the astrophysical features of the model and show that they fulfill regularity requirements. A key finding of this investigation is the absence of a core singularity within the anisotropic stellar formation. The solution matches the properties of the observed self-gravitating pulsar objects: SAX J1804.4-3658 (SS1), EXO1745-248, 4U1820-30, 4U1608-52, PSR J0740+6620, PSR J0030+0451, Cen X-4, and SAX J1804.4-3658 (SS2). \u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14102-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749130","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