发布求助
文献互助 智能选刊 最新文献

The European Physical Journal C最新文献

筛选
英文 中文
Topological defects in f(T) theory of gravity
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13800-2
S. P. Hatkar, D. P. Tadas, S. D. Katore
{"title":"Topological defects in f(T) theory of gravity","authors":"S. P. Hatkar,&nbsp;D. P. Tadas,&nbsp;S. D. Katore","doi":"10.1140/epjc/s10052-025-13800-2","DOIUrl":"10.1140/epjc/s10052-025-13800-2","url":null,"abstract":"<div><p>In this paper, we investigate the behaviour of domain walls and one-dimensional cosmic string with locally rotationally symmetric (LRS) Bianchi type-I metric in the context of <i>f</i>(<i>T</i>) gravity. Three different types of deceleration parameter (DP) forms, such as (i) <span>(q=-kt+l-1)</span>, (ii) <span>(q=b(t))</span>, and (iii) <span>(q=-1+frac{gamma }{1+a^gamma })</span>, are used to determine the exact solution of the field equation. We observe the profound effect of the torsion scalar <i>T</i> on physical parameters. Also, the universe was dominated by string at an early stage of evaluation.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13800-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184774","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
The impact of compact object deformation on thin accretion disk properties
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13794-x
Shokoufe Faraji
{"title":"The impact of compact object deformation on thin accretion disk properties","authors":"Shokoufe Faraji","doi":"10.1140/epjc/s10052-025-13794-x","DOIUrl":"10.1140/epjc/s10052-025-13794-x","url":null,"abstract":"<div><p>We investigate the standard relativistic geometrically thin and optically thick accretion disk in the background of a deformed compact object. The main purpose of this work is to determine whether such a deformed object possesses its own observational fingerprint that can distinguish it from Schwarzschild and Kerr black holes. Our analysis reveals the properties of this relativistic accretion disk model and its dependence on the initial parameters.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13794-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184684","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
Constraints on the parameters of the neutrino extension of the Standard Model
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13873-z
Volodymyr Gorkavenko, Oleksandr Khasai, Oleg Ruchayskiy, Mariia Tsarenkova
{"title":"Constraints on the parameters of the neutrino extension of the Standard Model","authors":"Volodymyr Gorkavenko,&nbsp;Oleksandr Khasai,&nbsp;Oleg Ruchayskiy,&nbsp;Mariia Tsarenkova","doi":"10.1140/epjc/s10052-025-13873-z","DOIUrl":"10.1140/epjc/s10052-025-13873-z","url":null,"abstract":"<div><p>Heavy neutral leptons (HNLs) are hypothetical particles proposed as a potential explanation for neutrino oscillations and the generation of the baryon asymmetry in the Universe. This paper focuses on HNLs with masses significantly above the electroweak scale. It is challenging to test for the presence of such particles directly. However, they leave behind effective interactions of Standard Model particles, leading in particular to charged lepton flavor violation (cLFV) processes. Non-observation of cLFV processes puts therefore constraints on the parameters of the HNLs. In this paper, we find the relations between the effective operators in the realistic case when neutrino masses are non-zero and the HNLs are non-degenerate. This allows us to strengthen the existing cLFV constraints on the tau-flavors from much stronger constraints on muon and electron flavors. We also link the baryon asymmetry of the Universe to the same higher-dimensional effective operators, providing complementary bounds on these parameters.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13873-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184706","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
Instability analysis of massive static phantom wormholes via the spectral method
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13867-x
Davide Batic, Denys Dutykh
{"title":"Instability analysis of massive static phantom wormholes via the spectral method","authors":"Davide Batic,&nbsp;Denys Dutykh","doi":"10.1140/epjc/s10052-025-13867-x","DOIUrl":"10.1140/epjc/s10052-025-13867-x","url":null,"abstract":"<div><p>Using the spectral method, we investigate the scalar and axial quasinormal modes (QNMs) of massive static phantom wormholes. Our results reveal the existence of purely imaginary QNMs that were not identified in previous studies, suggesting potential (in)stabilities as the ratio of the Schwarzschild radius to the wormhole throat varies within a specific range. For scalar perturbations, instabilities arise when this ratio exceeds 1.0, with the threshold value of 1.0 itself included. In the case of axial perturbations, the onset of instability occurs at smaller ratios, reflecting the impact of gravitational waves on the wormhole’s stability. The findings suggest that the wormhole remains stable when the throat size significantly exceeds the Schwarzschild radius. Our results align with existing literature but offer new insights into the stability conditions of phantom wormholes.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13867-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184705","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
Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13859-x
Jia-Zhou Liu, Wen-Di Guo, Shao-Wen Wei, Yu-Xiao Liu
{"title":"Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity","authors":"Jia-Zhou Liu,&nbsp;Wen-Di Guo,&nbsp;Shao-Wen Wei,&nbsp;Yu-Xiao Liu","doi":"10.1140/epjc/s10052-025-13859-x","DOIUrl":"10.1140/epjc/s10052-025-13859-x","url":null,"abstract":"<div><p>In this paper, we study the scenario in which the matter field is an electromagnetic field nonminimally coupled to the bumblebee vector field. We present exact charged spherically symmetric black hole solutions and slowly rotating charged solutions in bumblebee gravity with and without a cosmological constant. The static spherically symmetric solutions describe the Reissner–Nordström-like black hole and Reissner–Nordström-(anti) de Sitter-like black hole, while the stationary and axially symmetric solutions describe the Kerr–Newman-like black hole and Kerr–Newman–(anti) de Sitter-like black hole. We utilize the Hamilton–Jacobi formalism to study the shadows of the black holes. Additionally, we investigate the effect of the electric charge and Lorentz-violating parameters on the radius of the shadow reference circle and the distortion parameter. We find that the radius of the reference circle decreases with the Lorentz-violating parameter and the charge parameter, while the distortion parameter increases with the Lorentz-violating parameter and the charge parameter.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13859-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184703","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
Further study of (cbar{c}cbar{c}) system within a chiral quark model
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13822-w
Yuheng Wu, Xuejie Liu, Jialun Ping, Hongxia Huang, Yue Tan
{"title":"Further study of (cbar{c}cbar{c}) system within a chiral quark model","authors":"Yuheng Wu,&nbsp;Xuejie Liu,&nbsp;Jialun Ping,&nbsp;Hongxia Huang,&nbsp;Yue Tan","doi":"10.1140/epjc/s10052-025-13822-w","DOIUrl":"10.1140/epjc/s10052-025-13822-w","url":null,"abstract":"<div><p>Inspired by the recent ATLAS and CMS experiments on the invariant mass spectrum of <span>(J/psi J/psi )</span>, we systematically study the <span>(cbar{c}cbar{c})</span> system of <span>(J^{P}=0^{+})</span>. In the framework of chiral quark model, we have carried out bound-state calculation and resonance-state calculation respectively by using Real-scaling method. The results of bound-state calculation show that there are no bound states in the <span>(cbar{c}cbar{c})</span> with <span>(0^{+})</span> system. The resonance-state calculation shows that there are four possible resonances: <i>R</i>(6923), <i>R</i>(6996), <i>R</i>(7060) and <i>R</i>(7159). <i>R</i>(6923) and <i>R</i>(7159) are experimental candidates for <i>X</i>(6900) and <i>X</i>(7200), whose main decay channel is <span>(J/psi J/psi )</span>. It is important to note that the another major decay channel of <i>R</i>(7159) is <span>(chi _{c0} chi _{c0})</span>, and the <span>(chi _{c0} chi _{c0})</span> is also the main decay channel of <i>R</i>(6996), <i>R</i>(7060). Therefore, we propose to search experimentally for these two predicted resonances in the <span>(chi _{c0} chi _{c0})</span> invariant mass spectrum.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13822-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184685","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
Finding excesses in model parameter space
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-05 DOI: 10.1140/epjc/s10052-025-13795-w
Kierthika Chathirathas, Torben Ferber, Felix Kahlhoefer, Alessandro Morandini
{"title":"Finding excesses in model parameter space","authors":"Kierthika Chathirathas,&nbsp;Torben Ferber,&nbsp;Felix Kahlhoefer,&nbsp;Alessandro Morandini","doi":"10.1140/epjc/s10052-025-13795-w","DOIUrl":"10.1140/epjc/s10052-025-13795-w","url":null,"abstract":"<div><p>Simulation-based inference (SBI) makes it possible to infer the parameters of a model from high-dimensional low-level features of the observed events. In this work we show how this method can be used to establish the presence of a weak signal on top of an unknown background, to discard background events and to determine the signal properties. The key idea is to use SBI methods to identify events that are similar to each other in the sense that they agree on the inferred model parameters. We illustrate this method for the case of axion-like particles decaying to photons at beam-dump experiments. For poor detector resolution the diphoton mass cannot be reliably reconstructed, so there is no simple high-level observable that can be used to perform a bump hunt. Since the SBI methods do not require explicit high-level observables, they offer a promising alternative to increase the sensitivity to new physics.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13795-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184686","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
Solving arbitrary one-loop reduction via generating function
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-04 DOI: 10.1140/epjc/s10052-025-13848-0
Tingfei Li, Yuekai Song, Liang Zhang
{"title":"Solving arbitrary one-loop reduction via generating function","authors":"Tingfei Li,&nbsp;Yuekai Song,&nbsp;Liang Zhang","doi":"10.1140/epjc/s10052-025-13848-0","DOIUrl":"10.1140/epjc/s10052-025-13848-0","url":null,"abstract":"<div><p>Recently, the concept of generating function has been employed in one-loop reduction. For one-loop integrals encompassing arbitrary tensor ranks and higher-pole contributions, the generating function can be decomposed into a tensor part and a higher-pole part. While the tensor component has been thoroughly addressed in recent studies, there remains a lack of satisfactory investigations regarding the higher-pole part. In this work, we completely solve the problem. We first establish the partial differential equations governing the higher-pole generating function. Based on these equations, we derive an integration recursion relation and solve it iteratively. This approach enables us to explore the analytical structure of higher-pole reduction and provides a valuable tool for generating reduction coefficients efficiently.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13848-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108315","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
Prediction of mass and radii of anisotropic polytropic compact objects with Buchdahl-I metric
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-04 DOI: 10.1140/epjc/s10052-025-13871-1
S. A. Mardan, A. Zahra, Muhammad Bilal Riaz, Rubab Manzoor, Adnan Malik
{"title":"Prediction of mass and radii of anisotropic polytropic compact objects with Buchdahl-I metric","authors":"S. A. Mardan,&nbsp;A. Zahra,&nbsp;Muhammad Bilal Riaz,&nbsp;Rubab Manzoor,&nbsp;Adnan Malik","doi":"10.1140/epjc/s10052-025-13871-1","DOIUrl":"10.1140/epjc/s10052-025-13871-1","url":null,"abstract":"<div><p>In this article, we discuss several compact objects (GW 190814, PSR J0952-0607, PSR J0030+0451, PSR J0740+6620,   GW 170817,   PSR J1614-2230,   PSR J2215+5135, and 4U 1608-52) to predict their masses and radii. A generalized polytropic stellar model within the framework of general relativity is derived by employing the Buchdahl-I metric. All the physical quantities such as energy density, radial, and tangential pressure are well behaved, continuous and no singularity is observed. The obtained results are compatible with observational data for compact objects under consideration. The physical stability of this model is determined by using generalized hydrostatic equilibrium condition, energy conditions, causality conditions and Herrera’s cracking technique. We observe that our model fulfills all of the requirements for being a physically realistic model.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13871-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108310","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
Dark I-Love-Q
IF 4.2 2区 物理与天体物理
The European Physical Journal C Pub Date : 2025-02-04 DOI: 10.1140/epjc/s10052-025-13862-2
Jing-Yi Wu, Wei Li, Xin-Han Huang, Kilar Zhang
{"title":"Dark I-Love-Q","authors":"Jing-Yi Wu,&nbsp;Wei Li,&nbsp;Xin-Han Huang,&nbsp;Kilar Zhang","doi":"10.1140/epjc/s10052-025-13862-2","DOIUrl":"10.1140/epjc/s10052-025-13862-2","url":null,"abstract":"<div><p>For neutron stars, there exist universal relations insensitive to the equation of states, the so called I-Love-Q relations, which show the connections among the moment of inertia, tidal Love number and quadrupole moment. In this paper, we show that these relations also apply to dark stars, bosonic or fermionic. The relations can be extended to higher ranges of the variables, clarifying the deviations for dark stars in the literature, as those curves all approximate the ones generated by a polytropic equation of state, when taking the low density (pressure) limit. Besides, we find that for equation of states with scaling symmetries, the I-Love-Q curves do not change when adjusting the scaling parameters.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13862-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107883","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信