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

Thermodynamical topology with multiple defect curves for dyonic AdS black holes 动态AdS黑洞具有多缺陷曲线的热力学拓扑

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13620-w

Zi-Qing Chen, Shao-Wen Wei

{"title":"Thermodynamical topology with multiple defect curves for dyonic AdS black holes","authors":"Zi-Qing Chen, Shao-Wen Wei","doi":"10.1140/epjc/s10052-024-13620-w","DOIUrl":"10.1140/epjc/s10052-024-13620-w","url":null,"abstract":"<div>Dyonic black holes with quasitopological electromagnetism exhibit an intriguing phase diagram with two separated first-order coexistence curves. In this paper, we aim to uncover its influence on the black hole thermodynamical topology. At first, we investigate the phase transition and phase diagram of the dyonic black holes. Comparing with previous study that there is no black hole phase transition region for a middle pressure, we find this region can narrow or disappear by fine tuning the coupling parameter. Instead, two first-order phase transitions can be observed. Importantly, we uncover that such novel phase diagram shall lead to a multiple defect curve phenomenon in black hole topology where each dyonic black hole is treated as one defect in the thermodynamical parameter space. By examining the topology, it is shown that there could be one, three, or five black hole states for given pressure and temperature. For each case, the topological number is calculated. Our results show that the topological number always takes value of (+1), keeping unchanged even when the multiple defect curves appear. Therefore, our study provides an important ingredient on understanding the black hole thermodynamical topology.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13620-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859725","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

Possible signal of an exotic (I=1), (J=2) state in the (B rightarrow D^{*-}D^+K^+) reaction 在(B^{*-}D^+K^+)反应中一个奇异的(I=1)、(J=2)态的可能信号

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13671-z

Wen-Tao Lyu, Man-Yu Duan, Chu-Wen Xiao, En Wang, Eulogio Oset

{"title":"Possible signal of an exotic (I=1), (J=2) state in the (B rightarrow D^{*-}D^+K^+) reaction","authors":"Wen-Tao Lyu, Man-Yu Duan, Chu-Wen Xiao, En Wang, Eulogio Oset","doi":"10.1140/epjc/s10052-024-13671-z","DOIUrl":"10.1140/epjc/s10052-024-13671-z","url":null,"abstract":"<div>We study the (B^+ rightarrow D^{*-}D^+K^+) reaction, showing that a peak in the (D^+K^+) mass distribution around (2834 text { MeV}) reported by LHCb could be associated with a theoretical exotic state with that mass, a width of (19 text { MeV}) and (J^P=2^+), stemming from the interaction of the (D^{*+}K^{*+}) and (D^{*+}_s rho ^+) channels, which is a partner of the (0^+) (T_{c{bar{s}}}(2900)). We show that the data is compatible with this assumption, but also see that the mass distribution itself cannot discriminate between the spins (J=0), 1, 2 of the state. Then we evaluate the momenta of the angular mass distribution and show that they are very different for each of the spin assumptions, and that the momenta coming from interference terms have larger strength at the resonant energy than the peaks seen in the angular integrated mass distribution. We make a call for the experimental determination of these magnitudes, which has already been used by the LHCb in related decay reactions.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13671-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859527","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

Astrophysical insights into magnetic Penrose process around parameterized Konoplya–Rezzolla–Zhidenko black hole 围绕参数化Konoplya-Rezzolla-Zhidenko黑洞的磁彭罗斯过程的天体物理学见解

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13658-w

Tursunali Xamidov, Sanjar Shaymatov, Pankaj Sheoran, Bobomurat Ahmedov

{"title":"Astrophysical insights into magnetic Penrose process around parameterized Konoplya–Rezzolla–Zhidenko black hole","authors":"Tursunali Xamidov, Sanjar Shaymatov, Pankaj Sheoran, Bobomurat Ahmedov","doi":"10.1140/epjc/s10052-024-13658-w","DOIUrl":"10.1140/epjc/s10052-024-13658-w","url":null,"abstract":"<div>In this study, we investigate the parameterized Konoplya–Rezzolla–Zhidenko (KRZ) black hole (BH) spacetime in the presence of an external asymptotically uniform magnetic field. We first examine the innermost stable circular orbit (ISCO) radii for both neutral and charged test particles, demonstrating that the deformation parameters, (delta _1) and (delta _2), reduce the ISCO values. Subsequently, we assess the energy efficiency of the magnetic Penrose process (MPP) for an axially symmetric parameterized BH, analyzing the effects of the deformation parameters and the magnetic field on the energy extraction process. Our findings indicate that the rotational deformation parameter (delta _2) is crucial for the efficiency of energy extraction from the BH. The synergy between the rotational deformation parameter and the magnetic field significantly boosts the energy extraction efficiency, with values exceeding (100%). Interestingly, for extremal BHs with negative (delta _2) values, the energy efficiency increases, in contrast to Kerr BHs where the MPP effect diminishes. Additionally, we explore the astrophysical implications of the MPP by deriving the maximum energy of a proton escaping from the KRZ parameterized BH due to the beta decay of a free neutron near the horizon. Our results show that negative (delta _2) values require stronger magnetic fields to achieve equivalent energy levels for high-energy protons, providing deeper insights into high-energy astrophysical phenomena around the parameterized BH.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13658-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859528","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

Testing loop quantum gravity by quasi-periodic oscillations: rotating blackholes 用准周期振荡测试环量子引力：旋转黑洞

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13669-7

Jafar Khodagholizadeh, Ghadir Jafari, Alireza Allahyari, Ali Vahedi

{"title":"Testing loop quantum gravity by quasi-periodic oscillations: rotating blackholes","authors":"Jafar Khodagholizadeh, Ghadir Jafari, Alireza Allahyari, Ali Vahedi","doi":"10.1140/epjc/s10052-024-13669-7","DOIUrl":"10.1140/epjc/s10052-024-13669-7","url":null,"abstract":"<div>We investigate a compelling model of a rotating black hole that is deformed by the effects of loop quantum gravity (LQG). We present a simplified metric and explore two distinct geometries: one in which the masses of the black hole and white hole are equal, and another in which they differ. Our analysis yields the radius of the innermost stable circular orbits (ISCO), as well as the energy and angular momentum of a particle within this framework. Additionally, we find the frequency of the first-order resonance separately. We constrain the model by the quasi-periodic oscillations (QPO) of the X-ray binary GRO J1655-40. We show that (lambda =0.15^{+0.23}_{-0.14}) at (1sigma ) confidence level for equal mass black hole and white hole geometry. For the other geometry we get (lambda =0.11^{+0.07}_{-0.07}) at (1sigma ) confidence level. We encounter a degeneracy in the parameter space that hinders our ability to constrain (lambda ) with greater precision.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13669-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859530","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

Quasinormal modes of regular black holes with sub-Planckian curvature and Minkowskian core 具有亚普朗克曲率和明科夫斯基内核的规则黑洞的准正常模式

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13699-1

Chen Tang, Yi Ling, Qing-Quan Jiang, Guo-Ping Li

引用次数: 0

Heavy (K^*) mesons with open charm from (KD^{(*)}D^*) interactions 来自(KD^{(*)}D^*)相互作用的具有开放魅力的重(K^*)介子

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13683-9

Xiu-Lei Ren, K. P. Khemchandani, A. Martínez Torres

{"title":"Heavy (K^*) mesons with open charm from (KD^{(*)}D^*) interactions","authors":"Xiu-Lei Ren, K. P. Khemchandani, A. Martínez Torres","doi":"10.1140/epjc/s10052-024-13683-9","DOIUrl":"10.1140/epjc/s10052-024-13683-9","url":null,"abstract":"<div>In view of the recent discovery of (T_{cc}), which can be described as a (DD^*) molecular state, we perform a study of the (KDD^*) system, and its extension to studying (KD^*D^*), where (D^*D^*) is bound as a spin 1 (T_{cc})-like state, to search for the possible existence of exotic mesons with the open flavors ccs being part of their quark configuration. Considering the additional attractive interactions present in the KD and (KD^*) subsystems, where the states (D^*_{s0}(2317)) and (D_{s1}(2460)) are generated, we solve the Faddeev equations considering the fixed-center approximation for the mentioned three-body systems and find the existence of two doubly charmed (K^*)-like mesons, (K_{cc}^*(4309)) and (K_{cc}^*(4449)), with quantum numbers (I(J^P)=1/2,(1^-)). Considering the respective three-body thresholds of the two systems, both (K_{cc})-states are bound by around 60 MeV. An experimental confirmation will bring evidence for the existence of a degree of exoticity beyond charm +2.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13683-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859533","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

Enabling precise predictions for left-right symmetry at colliders 能够精确预测对撞机的左右对称

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13614-8

Jonathan Kriewald, Miha Nemevšek, Fabrizio Nesti

{"title":"Enabling precise predictions for left-right symmetry at colliders","authors":"Jonathan Kriewald, Miha Nemevšek, Fabrizio Nesti","doi":"10.1140/epjc/s10052-024-13614-8","DOIUrl":"10.1140/epjc/s10052-024-13614-8","url":null,"abstract":"<div>We investigate the structure of the minimal left-right symmetric model that enables precise predictions in the gauge, scalar and neutrino sector. We revisit the complete set of mass spectra and mixings for the charged and neutral gauge bosons, would-be-Goldstones and gauge fixing, together with the ghost Lagrangian. In the scalar sector, we analytically re-derive all the massive states with mixings and devise a non-trivial physical input scheme, expressing the model couplings in terms of masses and mixing angles. Fermion couplings are also determined in closed form, including the Dirac mixing in the neutrino sector, evaluated explicitly using the Cayley–Hamilton theorem. These analytic developments are implemented in a comprehensive FeynRules model file. We calculate the one loop QCD corrections and provide a complete UFO file for NLO studies, demonstrated on relevant hadron-collider benchmarks. We provide various restricted variants of the model file with different gauges, massless states, neutrino hierarchies and parity violating (g_L ne g_R) gauge couplings.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13614-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859731","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

Torsional four-fermion interaction and the Raychaudhuri equation 扭转四费米子相互作用和雷乔杜里方程

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13618-4

Shibendu Gupta Choudhury, Sagar Kumar Maity, Amitabha Lahiri

{"title":"Torsional four-fermion interaction and the Raychaudhuri equation","authors":"Shibendu Gupta Choudhury, Sagar Kumar Maity, Amitabha Lahiri","doi":"10.1140/epjc/s10052-024-13618-4","DOIUrl":"10.1140/epjc/s10052-024-13618-4","url":null,"abstract":"<div>Intrinsic spin of fermions can generate torsion in spacetime. This torsion is a non-propagating field that can be integrated out, leaving an effective non-universal four-fermion interaction. This geometrical interaction affects fermions inside a matter distribution and can be expected to become stronger as the density grows. We investigate the role of this interaction in a gravitationally collapsing fermionic distribution, by considering a statistical average of the interaction term which incorporates the effect of mixed vector and axial currents. We consider a gravitationally collapsing distribution of massive fermions, ignoring other interactions. Using simplified yet reasonable assumptions, we establish that the contribution can be attractive or repulsive depending on how torsion couples with different chiralities. Also, the interaction starts to dominate as the collapse proceeds, accelerating or decelerating the collapse depending on the relative signs of the geometrical interaction between different species of fermions.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13618-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859531","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 structure of the (f_0(980)) from system size dependent hadronic resonance ratios in p + p, p + Pb, and Pb + Pb collisions at the LHC 从大型强子对撞机上 p + p、p + Pb 和 Pb + Pb 碰撞中与系统尺寸相关的强子共振比看（f_0(980)）的结构

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13690-w

Tom Reichert, Jan Steinheimer, Volodymyr Vovchenko, Christoph Herold, Ayut Limphirat, Marcus Bleicher

{"title":"The structure of the (f_0(980)) from system size dependent hadronic resonance ratios in p + p, p + Pb, and Pb + Pb collisions at the LHC","authors":"Tom Reichert, Jan Steinheimer, Volodymyr Vovchenko, Christoph Herold, Ayut Limphirat, Marcus Bleicher","doi":"10.1140/epjc/s10052-024-13690-w","DOIUrl":"10.1140/epjc/s10052-024-13690-w","url":null,"abstract":"<div>It is shown that the hadronic phase in ultra-relativistic heavy ion collisions can be used to understand the properties of the (f_0(980)) resonance. In particular it is shown that the centrality dependence of the (f_0(980)/pi ) and (f_0(980)/phi ) ratios depends strongly on the (f_0(980)rightarrow {overline{K}}+K) branching ratio and whether the (f_0(980)) is produced as a (left| {overline{q}}q rightrangle ) or (left| {overline{s}}s rightrangle ) state. These conclusions are drawn from calculations within the partial chemical equilibrium of the HRG model within Thermal-FIST as well as with the fully non-equilibrium hybrid-transport approach UrQMD. Our findings show how the hadronic phase in heavy ion collisions can be used for studies of exotic hadron properties otherwise possible only in dedicated experiments such as PANDA.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13690-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859526","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

Analyzing the speed of sound in neutron star with machine learning 用机器学习分析中子星的声速

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2024-12-20 DOI: 10.1140/epjc/s10052-024-13668-8

Sagnik Chatterjee, Harsha Sudhakaran, Ritam Mallick

{"title":"Analyzing the speed of sound in neutron star with machine learning","authors":"Sagnik Chatterjee, Harsha Sudhakaran, Ritam Mallick","doi":"10.1140/epjc/s10052-024-13668-8","DOIUrl":"10.1140/epjc/s10052-024-13668-8","url":null,"abstract":"<div>Matter properties at the intermediate densities are still unknown to us. In this work, we use a neural network approach to study matter at intermediate densities to analyze the variation of the speed of sound and the measure of trace anomaly considering astrophysical constraints of mass–radius measurement of 18 neutron stars. Our numerical results show that there is a sharp rise in the speed of sound just beyond the saturation energy density. It attains a peak around 3–4 times the saturation energy density and, after that, decreases. This hints towards the appearance of new degrees of freedom and smooth transition from hadronic matter in massive stars. The trace anomaly is maximum at low density (surface of the stars) and decreases as we reach high density. It approaches zero and can even be slightly negative at the centre of massive stars. It has a negative trough beyond the maximal central densities of neutron stars. The change in sign of the trace anomaly hints towards a near-conformal matter at the centre of neutron stars, which may not necessarily be conformal quark matter.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13668-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859728","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