The European Physical Journal C最新文献_第3页

The Monument experiment: ordinary muon capture studies for (0nu beta beta ) decay 纪念碑实验：（0nu beta beta ）衰变的普通μ介子俘获研究

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-20 DOI: 10.1140/epjc/s10052-024-13470-6

G. R. Araujo, D. Bajpai, L. Baudis, V. Belov, E. Bossio, T. E. Cocolios, H. Ejiri, M. Fomina, K. Gusev, I. H. Hashim, M. Heines, S. Kazartsev, A. Knecht, E. Mondragón, Z. W. Ng, I. Ostrovskiy, F. Othman, N. Rumyantseva, S. Schönert, M. Schwarz, E. Shevchik, M. Shirchenko, Yu Shitov, E. O. Sushenok, J. Suhonen, S. M. Vogiatzi, C. Wiesinger, I. Zhitnikov, D. Zinatulina

{"title":"The Monument experiment: ordinary muon capture studies for (0nu beta beta ) decay","authors":"G. R. Araujo, D. Bajpai, L. Baudis, V. Belov, E. Bossio, T. E. Cocolios, H. Ejiri, M. Fomina, K. Gusev, I. H. Hashim, M. Heines, S. Kazartsev, A. Knecht, E. Mondragón, Z. W. Ng, I. Ostrovskiy, F. Othman, N. Rumyantseva, S. Schönert, M. Schwarz, E. Shevchik, M. Shirchenko, Yu Shitov, E. O. Sushenok, J. Suhonen, S. M. Vogiatzi, C. Wiesinger, I. Zhitnikov, D. Zinatulina","doi":"10.1140/epjc/s10052-024-13470-6","DOIUrl":"10.1140/epjc/s10052-024-13470-6","url":null,"abstract":"<div><p>The M<span>onument</span> experiment measures ordinary muon capture (OMC) on isotopes relevant for neutrinoless double-beta (<span>(0nu beta beta )</span>) decay and nuclear astrophysics. OMC is a particularly attractive tool for improving the theoretical description of <span>(0nu beta beta )</span> decay. It involves similar momentum transfers and allows testing the virtual transitions involved in <span>(0nu beta beta )</span> decay against experimental data. During the 2021 campaign, M<span>onument</span> studied OMC on <span>(^{76})</span>Se and <span>(^{136})</span>Ba, the isotopes relevant for next-generation <span>(0nu beta beta )</span> decay searches, like L<span>egend</span> and n<span>EXO</span>. The experimental setup has been designed to accurately extract the total and partial muon capture rates, which requires precise reconstruction of energies and time-dependent intensities of the OMC-related <span>(gamma )</span> rays. The setup also includes a veto counter system to allow selecting a clean sample of OMC events. This work provides a detailed description of the M<span>onument</span> setup operated during the 2021 campaign, its two DAQ systems, calibration and analysis approaches, and summarises the achieved detector performance. Future improvements are also discussed.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13470-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672550","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

Black bounces in Cotton gravity 黑色在棉花引力中反弹

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-20 DOI: 10.1140/epjc/s10052-024-13568-x

Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo, Manuel E. Rodrigues, Diego Rubiera-Garcia, Luís F. Dias da Silva, Henrique A. Vieira

{"title":"Black bounces in Cotton gravity","authors":"Ednaldo L. B. Junior, José Tarciso S. S. Junior, Francisco S. N. Lobo, Manuel E. Rodrigues, Diego Rubiera-Garcia, Luís F. Dias da Silva, Henrique A. Vieira","doi":"10.1140/epjc/s10052-024-13568-x","DOIUrl":"10.1140/epjc/s10052-024-13568-x","url":null,"abstract":"<div><p>Recently, J. Harada proposed a theory relating gravity to the Cotton tensor, dubbed as “Cotton gravity” (CG). This is an extension of General Relativity such that every solution of the latter turns out to be a solution of the former (but the converse is not true) and, furthermore, it is possible to derive the cosmological constant as an integration constant within it. In this work we investigate CG by coupling it to both non-linear electrodynamics (NLED) and scalar fields. We study static and spherically symmetric solutions implementing a bouncing behaviour in the radial function so as to avoid the development of singularities, inspired by the Simpson–Visser black bounce and the Bardeen model, both interpreted as magnetic monopoles. We identify the NLED Lagrangian density and the scalar field potential generating such solutions, and investigate the corresponding gravitational configurations in terms of horizons, behaviour of the metric functions, and regularity of the Kretchsman curvature scalar. Our analysis extends the class of non-singular geometries found in the literature and paves the ground for further analysis of black holes in CG.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13568-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672551","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

Imprints of the Einasto density profile and complexity factor on traversable wormholes in f(R, T) theory f(R, T)理论中埃纳斯特密度曲线和可穿越虫洞复杂性因子的印迹

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-20 DOI: 10.1140/epjc/s10052-024-13561-4

Tayyab Naseer, M. Sharif, Mona Faiza, Baiju Dayanandan

{"title":"Imprints of the Einasto density profile and complexity factor on traversable wormholes in f(R, T) theory","authors":"Tayyab Naseer, M. Sharif, Mona Faiza, Baiju Dayanandan","doi":"10.1140/epjc/s10052-024-13561-4","DOIUrl":"10.1140/epjc/s10052-024-13561-4","url":null,"abstract":"<div><p>The focus of this work is centered on determining whether traversable wormholes admitting Einasto density profile exist within the framework of <i>f</i>(<i>R</i>, <i>T</i>) gravity. Using the Morris–Thorne spacetime, we express the wormhole configuration and formulate the anisotropic gravitational equations for a particular linear modified model. Afterwards, by considering two different (constant and variable) redshift functions, we derive the shape function for wormholes and examine its potential stability. The developed functions conform to the necessary conditions and form a connection between two spacetime regions that are asymptotically flat. We also examine the viability of resulting wormhole solutions by verifying their violation with the null energy conditions. We also investigate the active gravitational mass and the complexity factor for our solutions. The later quantity is found to be negative near the wormhole throat and becomes zero when moving away from this point. Further, various methods of stability analysis are utilized to assess the developed models. Our results suggest that the constructed wormhole geometries meet the necessary conditions, thereby existing within the considered modified gravity.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13561-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672657","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

Searching for the vector-like X-quark at the future electron–proton colliders 在未来的电子-质子对撞机上寻找类矢量 X 夸克

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13475-1

Yan-Ju Zhang, Yong-Tao Zhu, Lin Han, Yan-Ping Bi, Tai-Gang Liu

引用次数: 0

Emergence of cosmic space and horizon thermodynamics in the context of the quantum-deformed entropy 量子变形熵背景下宇宙空间和地平线热力学的出现

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13517-8

Jianming Chen, Gerui Chen

{"title":"Emergence of cosmic space and horizon thermodynamics in the context of the quantum-deformed entropy","authors":"Jianming Chen, Gerui Chen","doi":"10.1140/epjc/s10052-024-13517-8","DOIUrl":"10.1140/epjc/s10052-024-13517-8","url":null,"abstract":"<div><p>According to the quantum deformation approach to quantum gravity, the thermodynamical entropy of a quantum-deformed (q-deformed) black hole with horizon area <i>A</i> established by Jalalzadeh is expressed as <span>(S = pi sin left( frac{A}{8Gmathcal {N}} right) /sin left( frac{pi }{2mathcal {N}}right) )</span>, where <span>(mathcal {N}=L_q^2/L_{p}^2)</span> is the q-deformation parameter, <span>(L_{p})</span> denotes the Planck length, and <span>(L_q)</span> denotes the quantum-deformed cosmic apparent horizon distance. In this paper, assuming that the q-deformed entropy is associated with the apparent horizon of the Friedmann–Robertson–Walker (FRW) universe, we derive the modified Friedmann equation from the unified first law of thermodynamics, <span>( dE = TdS + WdV )</span>. And this one obtained is in line with the modified Friedmann equation derived from the law of emergence proposed by Padmanabhan. It clearly shows the connection between the law of emergence and thermodynamics. We further investigate the constraints of entropy maximization in the framework of the q-deformed horizon entropy, and the results demonstrate the consistency of the law of emergence with the maximization of the q-deformed horizon entropy.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13517-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672440","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

Black hole solutions in double field theory 双重场论中的黑洞解

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13537-4

Shuxuan Ying

引用次数: 0

Demonstration of magnetically silent optically pumped magnetometers for the TUCAN electric dipole moment experiment 用于 TUCAN 电偶极矩实验的静磁光泵磁强计演示

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13544-5

Wolfgang Klassen, Shomi Ahmed, Kiera Pond Grehan, Chris Hovde, Kirk W. Madison, Russell R. Mammei, Jeffery W. Martin, Mark McCrea, Tahereh Mohammadi, Takamasa Momose, Patrick Opsahl, David C. M. Ostapchuk

{"title":"Demonstration of magnetically silent optically pumped magnetometers for the TUCAN electric dipole moment experiment","authors":"Wolfgang Klassen, Shomi Ahmed, Kiera Pond Grehan, Chris Hovde, Kirk W. Madison, Russell R. Mammei, Jeffery W. Martin, Mark McCrea, Tahereh Mohammadi, Takamasa Momose, Patrick Opsahl, David C. M. Ostapchuk","doi":"10.1140/epjc/s10052-024-13544-5","DOIUrl":"10.1140/epjc/s10052-024-13544-5","url":null,"abstract":"<div><p>We report the performance of a magnetically silent optically pumped cesium magnetometer with a statistical sensitivity of 3.5 pT/<span>(sqrt{textrm{Hz}})</span> at 1 Hz and a stability of 90 fT over 150 s of measurement. Optical pumping with coherent, linearly-polarized, resonant light leads to a relatively long-lived polarized ground state of the cesium vapour contained in a measurement cell. The state precesses at its Larmor frequency in the magnetic field to be measured. Nonlinear magneto-optical rotation then leads to the rotation of the plane of polarization of a linearly polarized probe laser beam. The rotation angle is modulated at twice the Larmor frequency. A measurement of this frequency constitutes an absolute measurement of the magnetic field magnitude. Featuring purely optical operation, non-magnetic construction, low noise floor, and high stability, this sensor will be used for the upcoming TUCAN electric dipole moment experiment and other highly sensitive magnetic applications. Novel aspects of the system include commercial construction and the ability to operate up to 24 sensors on a single probe laser diode.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13544-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672741","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

Detecting a gravitational wave background from inflation with null energy condition violation: prospects for Taiji 从违反空能量条件的膨胀中探测引力波背景：太极的前景

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13529-4

Zu-Cheng Chen, Lang Liu

{"title":"Detecting a gravitational wave background from inflation with null energy condition violation: prospects for Taiji","authors":"Zu-Cheng Chen, Lang Liu","doi":"10.1140/epjc/s10052-024-13529-4","DOIUrl":"10.1140/epjc/s10052-024-13529-4","url":null,"abstract":"<div><p>The null energy condition (NEC) is a fundamental principle in general relativity, and its violation could leave discernible signatures in gravitational waves (GWs). A violation of the NEC during the primordial era would imprint a blue-tilted spectrum on the stochastic gravitational wave background (SGWB) at nanohertz frequencies, potentially accounting for the recently detected signal by pulsar timing arrays. Remarkably, models of NEC violation during inflation also predict a nearly scale-invariant GW spectrum in the millihertz frequency range, which could be detectable by upcoming space-based GW detectors such as Taiji. The observation of this distinctive spectrum would provide compelling evidence for new physics beyond the standard cosmological paradigm. In this study, we explore Taiji’s ability to detect an SGWB arising from NEC violation during inflation, considering various foregrounds and noise sources, including an extragalactic foreground from binary black hole mergers throughout the Universe, a galactic foreground from white dwarf binaries, and the intrinsic noise of the Taiji detector. Employing comprehensive Bayesian parameter estimation techniques to analyze simulated Taiji data, we demonstrate a remarkable improvement in precision of three orders of magnitude compared to the NANOGrav 15-year data set for measuring the tensor power spectrum amplitude, <span>(P_{T,2})</span>, during the second inflationary stage. This substantial enhancement in measurement capabilities underscores Taiji’s potential as a powerful probe for investigating the NEC violation in the early Universe.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13529-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672442","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

Anisotropic charge transport in strongly magnetized relativistic matter 强磁化相对论物质中的各向异性电荷传输

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13570-3

Ritesh Ghosh, Igor A. Shovkovy

{"title":"Anisotropic charge transport in strongly magnetized relativistic matter","authors":"Ritesh Ghosh, Igor A. Shovkovy","doi":"10.1140/epjc/s10052-024-13570-3","DOIUrl":"10.1140/epjc/s10052-024-13570-3","url":null,"abstract":"<div><p>We investigate electrical charge transport in hot magnetized plasma using first-principles quantum field theoretical methods. By employing Kubo’s linear response theory, we express the electrical conductivity tensor in terms of the fermion damping rate in the Landau-level representation. Utilizing leading-order results for the damping rates from a recent study within a gauge theory, we derive the transverse and longitudinal conductivities for a strongly magnetized plasma. The analytical expressions reveal drastically different mechanisms that explain the high anisotropy of charge transport in a magnetized plasma. Specifically, the transverse conductivity is suppressed, while the longitudinal conductivity is enhanced by a strong magnetic field. As in the case of zero magnetic field, longitudinal conduction is determined by the probability of charge carriers to remain in their quantum states without damping. In contrast, transverse conduction critically relies on quantum transitions between Landau levels, effectively lifting charge trapping in localized Landau orbits. We examine the temperature and magnetic field dependence of the transverse and longitudinal electrical conductivities over a wide range of parameters and investigate the effects of a nonzero chemical potential. Additionally, we extend our analysis to strongly coupled quark-gluon plasma and study the impact of the coupling constant on the anisotropy of electrical charge transport.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13570-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672439","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

Planar vortices in a Lorentz symmetry breaking environment 洛伦兹对称破缺环境中的平面涡旋

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-11-19 DOI: 10.1140/epjc/s10052-024-13577-w

E. Mavigno, H. Belich, G. Luchini

引用次数: 0