Modern Physics Letters A最新文献_第10页

Electromagnetic energy transfer processes in effective electro-magneto dynamics of axions 轴子有效电磁动力学中的电磁能传递过程

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-18 DOI: 10.1142/s0217732323501377

A. Patkós

引用次数: 1

Quasi-local black hole thermodynamics and gravitational pressure 准局域黑洞热力学和引力压力

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-17 DOI: 10.1142/s0217732323501286

Yunshuang Du

引用次数: 0

Thermal quantum correlations in a three-qubit spin chain under an in-homogeneous magnetic field 非均匀磁场下三量子位自旋链中的热量子相关

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-17 DOI: 10.1142/s0217732323501390

Matin Alipour, Rahime Sufiani

{"title":"Thermal quantum correlations in a three-qubit spin chain under an in-homogeneous magnetic field","authors":"Matin Alipour, Rahime Sufiani","doi":"10.1142/s0217732323501390","DOIUrl":"https://doi.org/10.1142/s0217732323501390","url":null,"abstract":"The thermal quantum correlations of a three-qubit spin chain of XY type under an in-homogeneous magnetic field have been investigated, where by considering magnetic fields with different magnitudes [Formula: see text], [Formula: see text] and [Formula: see text] for each spin, the quantum correlations between the adjacent and the non-adjacent qubits (spins) have been studied. For this purpose, the concurrence as an entanglement quantifier and the trace distance discord as a discord-like quantifier have been computed for the corresponding bipartite subsystems with the reduced density matrices [Formula: see text], [Formula: see text] and [Formula: see text]. The differences between the concurrence and the trace distance discord, are explained in detail. Their dependence on the parameters of the uniform magnetic field [Formula: see text], the temperature [Formula: see text], and the in-homogeneity parameter [Formula: see text] is discussed so that the thermal correlation decreases by increasing the mentioned parameters. Also, the results show that by changing and controlling the parameters [Formula: see text], [Formula: see text] and [Formula: see text], especially the in-homogeneous magnetic field [Formula: see text], it is possible that the correlation value between non-adjacent spins, i.e. [Formula: see text] can be reached to a greater value than the thermal correlations between adjacent spins, i.e. [Formula: see text] and [Formula: see text]. Moreover, it is shown that the trace distance [Formula: see text] between the non-adjacent spins has always a lower value than those of the adjacent spins [Formula: see text] and [Formula: see text]. Finally, the results show that in-homogeneous magnetic field b can be effective for improving thermal quantum correlation.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135992939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nuclear viscosity estimated by dynamics of neck formation in the early stage of nuclear collision 核碰撞早期颈部形成动力学估计核粘度

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-12 DOI: 10.1142/s0217732323501365

Amano, S., Aritomo, Y., Ohta, M.

引用次数: 0

Dark energy black holes with intermediate masses at high redshifts: An earlier generation of quasars and observations 高红移的中等质量暗能量黑洞:早期的类星体和观测

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-09 DOI: 10.1142/s0217732323501353

Anupam Singh

{"title":"Dark energy black holes with intermediate masses at high redshifts: An earlier generation of quasars and observations","authors":"Anupam Singh","doi":"10.1142/s0217732323501353","DOIUrl":"https://doi.org/10.1142/s0217732323501353","url":null,"abstract":"Dark energy is the largest fraction of the energy density of our universe — yet it remains one of the enduring enigmas of our times. Here we show that dark energy can be used to solve 2 tantalizing mysteries of the observable universe. We build on existing models of dark energy linked to neutrino masses. In these models, dark energy can undergo phase transitions and form black holes. Here we look at the implications of the family structure of neutrinos for the phase transitions in dark energy and associated peaks in black hole formation. It has been previously shown that one of these peaks in black hole formation is associated with the observed peak in quasar formation at redshifts [Formula: see text]. Here, we predict that there will also be an earlier peak in the dark energy black holes at high redshifts [Formula: see text]. These dark energy black holes formed at high redshifts are Intermediate Mass Black Holes (IMBHs). These dark energy black holes at large redshift can help explain both the EDGES observations and the observations of large Supermassive Black Holes (SMBHs) at redshifts of 7 or larger. This work directs us to actively look for these dark energy black holes at these high redshifts as predicted here through targeted searches for these black holes at the redshifts [Formula: see text] near 18. There is a slight dependence of the location of the peak on the lightest neutrino mass. This may enable a measurement of the lightest neutrino mass — something which has eluded us so far. Finding these dark energy black holes of Intermediate Mass should be within the reach of upcoming observations — particularly with the James Webb Space Telescope — but perhaps also through the use of other innovative techniques focusing specifically on the redshifts [Formula: see text] around 18.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135146932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of charge symmetry breaking on gluon and sea quark distributions in the pion and kaon 电荷对称破缺对介子和介子中胶子和海夸克分布的影响

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-07 DOI: 10.1142/s0217732323501328

Parada T. P. Hutauruk

{"title":"Impact of charge symmetry breaking on gluon and sea quark distributions in the pion and kaon","authors":"Parada T. P. Hutauruk","doi":"10.1142/s0217732323501328","DOIUrl":"https://doi.org/10.1142/s0217732323501328","url":null,"abstract":"In this exploratory study, I present, for the first time, the implications of the charge symmetry breaking (CSB) that arise from the [Formula: see text] and [Formula: see text] quark-mass differences on gluon and sea quark distribution functions of the pion and kaon in the framework of the Nambu–Jona-Lasino (NJL) model, which is a quark-level chiral effective theory of QCD, with the help of the proper-time regularization scheme to simulate color confinement of QCD. From the analysis, one finds that the charge symmetry (CS) gluon distribution for the pion has a good agreement with the prediction results obtained from the recent lattice QCD simulation and JAM global fit QCD analysis at a higher scale of [Formula: see text][Formula: see text]GeV 2 . The size of the CSB effects on gluon and sea quark distributions for the pion with the realistic ratios of [Formula: see text] at [Formula: see text][Formula: see text]GeV 2 are, respectively, estimated by 1.3% and 2.0% at [Formula: see text] in comparison with those for [Formula: see text], while those for the kaon are approximately about 0.3% and 0.5% at [Formula: see text], respectively. A remarkable result is found that the CSB effects on gluon distribution for the kaon are smaller than that for the pion, which has a similar prediction result as that for the CS case.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135301110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A statistical derivation of Bekenstein–Hawking entropy for Schwarzschild black holes 史瓦西黑洞贝肯斯坦-霍金熵的统计推导

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-07 DOI: 10.1142/s0217732323501316

Naman Kumar

引用次数: 0

Quasinormal modes, Hawking radiation and absorption of the massless scalar field for Bardeen black hole surrounded by perfect fluid dark matter 被完美流体暗物质包围的巴丁黑洞的准正态模式、霍金辐射和无质量标量场的吸收

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-09-22 DOI: 10.1142/s021773232350102x

Qi Sun, Qian Li, Yu Zhang, Qi-Quan Li

{"title":"Quasinormal modes, Hawking radiation and absorption of the massless scalar field for Bardeen black hole surrounded by perfect fluid dark matter","authors":"Qi Sun, Qian Li, Yu Zhang, Qi-Quan Li","doi":"10.1142/s021773232350102x","DOIUrl":"https://doi.org/10.1142/s021773232350102x","url":null,"abstract":"We study the quasinormal modes, Hawking radiation and absorption cross-section of the Bardeen black hole surrounded by perfect fluid dark matter for a massless scalar field. Our results show that the oscillation frequency of quasinormal modes is enhanced as magnetic charge [Formula: see text] or the dark matter parameter [Formula: see text] increases. For damping rate of quasinormal modes, the influence of them is different. Specifically, the increase of dark matter parameter [Formula: see text] makes the damping rate increasing at first and then decreasing. While the damping rate is continuously decreasing with the increase of the magnetic charge [Formula: see text]. Moreover, we find that the increase of the dark matter parameter [Formula: see text] enhances the power emission spectrum whereas magnetic charge [Formula: see text] suppresses it. This means that the lifespan of black holes increases for smaller value of [Formula: see text] and larger value of [Formula: see text] when other parameters are fixed. Finally, the absorption cross-section of the considered black hole is calculated with the help of the partial wave approach. Our results suggest that the absorption cross-section decreases with the dark matter parameter [Formula: see text] or the magnetic charge [Formula: see text] increasing.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"256 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136099111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

The decay τ→3πντ and axial-vector meson a1 in the NJL model NJL模型中衰变τ→3πντ和轴矢量介子a1

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-09-21 DOI: 10.1142/s0217732323501109

Mikhail K. Volkov, Kanat Nurlan, Aleksey A. Pivovarov

引用次数: 0

Effect of the non-commutativity of space on the improved Mobius square plus generalized Yukawa potentials of the Klein–Gordon and Schrödinger equations in 3D-RNCQS and 3D-NRNCQS symmetries 空间非交换性对3D-RNCQS和3D-NRNCQS对称中Klein-Gordon方程和Schrödinger方程的改进Mobius平方加广义Yukawa势的影响

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-09-19 DOI: 10.1142/s0217732323501055

Abdelmadjid Maireche

{"title":"Effect of the non-commutativity of space on the improved Mobius square plus generalized Yukawa potentials of the Klein–Gordon and Schrödinger equations in 3D-RNCQS and 3D-NRNCQS symmetries","authors":"Abdelmadjid Maireche","doi":"10.1142/s0217732323501055","DOIUrl":"https://doi.org/10.1142/s0217732323501055","url":null,"abstract":"Under the influence of the deformation space-space symmetries, the improved Mobius square plus generalized Yukawa potentials (IMSGYPs) have been employed to solve the deformed Klien–Gordon equation in three-dimensional noncommutative relativistic quantum space (3D-RNCQS) symmetries. Combined with the approximation approach suggested by Greene and Aldrich, we also employ the parametric Bopp’s shift approach and standard perturbation theory to derive novel relativistic energy eigenvalues. The new relativistic energy eigenvalues of (N 2 , K 2 , NI, ScI, and RbH) diatomic molecules under the IMSGYPs were shown to be sensitive to the atomic quantum numbers ([Formula: see text]), the mixed potential depths ([Formula: see text]), the screening parameter’s inverse [Formula: see text] and non-commutativity parameters ([Formula: see text], [Formula: see text], [Formula: see text]). In addition, we analyzed the new non-relativistic energy values in three-dimensional noncommutative non-relativistic quantum space (3D-NRNCQS) symmetries, by applying the well-known mapping in the literature. Furthermore, we studied many special cases useful to researchers in the framework of the new extended symmetries, such as the newly generalized Mobius square potential, the newly generalized Yukawa potential, and the newly generalized Deng-Fan potential. The study is further extended to calculate the mass spectra of mesons of the heavy quarkonium system, such as [Formula: see text], bottomonium [Formula: see text], [Formula: see text] and light mesons [Formula: see text] and [Formula: see text], that have the quark and antiquark flavors within the framework of the IMSGYPs model in 3D-NRNCQS symmetries.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135011561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0