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Accelerating universe in terms of Hankel function index 以汉克尔函数指数表示的加速宇宙
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2024-01-06 DOI: 10.1142/s021773232350178x
K. Suratgar, M. Mohsenzadeh, E. Yusofi, F. Taghizadeh-Farahmand
{"title":"Accelerating universe in terms of Hankel function index","authors":"K. Suratgar, M. Mohsenzadeh, E. Yusofi, F. Taghizadeh-Farahmand","doi":"10.1142/s021773232350178x","DOIUrl":"https://doi.org/10.1142/s021773232350178x","url":null,"abstract":"In this paper, [Formula: see text] cosmology is proposed for the accelerating universe with asymptotic de Sitter expansion in terms of Hankel function index [Formula: see text]. To some extent, both the initial expansion during early inflation and the current accelerated expansion can be studied with a vacuum cosmic fluid, i.e. [Formula: see text] in the pure de Sitter phase. Observational data further support the notion of a quasi-vacuum fluid, rather than a pure vacuum, contributing to the quasi-de Sitter acceleration in both the early and late universe. By examining the asymptotic expansion of the Henkel function as an approximate solution of the Mukhanov–Sasaki equation, we seek a more detailed study of quasi-de Sitter solutions in cosmology containing vacuum-like fluid.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"53 10","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449295","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
Numerical investigations of the fractional order derivative-based accelerating universe in the modified gravity 修正引力中基于分数阶导数的加速宇宙数值研究
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2024-01-06 DOI: 10.1142/s0217732323501808
A. Alderremy, J. Gómez-Aguilar, Z. Sabir, Muhammad Asif Zahoor Raja, Shaban Aly
{"title":"Numerical investigations of the fractional order derivative-based accelerating universe in the modified gravity","authors":"A. Alderremy, J. Gómez-Aguilar, Z. Sabir, Muhammad Asif Zahoor Raja, Shaban Aly","doi":"10.1142/s0217732323501808","DOIUrl":"https://doi.org/10.1142/s0217732323501808","url":null,"abstract":"In this work, a Liouville–Caputo fractional order (FO) derivative for the mathematical system based on the accelerating universe in the modified gravity (AUMG), i.e. FO-AUMG is proposed to get more accurate solutions. The nonlinear dynamics of the FO-AUMG is classified into five dynamics. The performances of the designed nonlinear FO-AUMG are numerically stimulated with the stochastic procedures of Levenberg–Marquardt backpropagated (LMB) scheme-based neural networks. The statics for FO-AUMS is used for the nonlinear FO-AUMG as 72%, 16% and 12% for training, authorization, and testing. Twenty neurons in hidden layers have been used to approximate the solution of the nonlinear FO-AUMS. The comparison of three different cases of the nonlinear FO-AUMS is performed with dataset generated by Adams method. To validate the uniformity, legitimacy, precision, and competence of LMB-based adaptive neural networks, the outcomes of the state transitions parameters, regression, correlation, error-histogram plots have been exploited.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"61 43","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449263","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
Multipartite quantum key agreement against d-dimensional collective-dephasing noise 对抗 d 维集体相干噪声的多方量子密钥协议
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-30 DOI: 10.1142/s0217732323501791
Wan-Li Hong, Chen-Ming Bai, Su-juan Zhang, Lu Liu
{"title":"Multipartite quantum key agreement against d-dimensional collective-dephasing noise","authors":"Wan-Li Hong, Chen-Ming Bai, Su-juan Zhang, Lu Liu","doi":"10.1142/s0217732323501791","DOIUrl":"https://doi.org/10.1142/s0217732323501791","url":null,"abstract":"In this paper, we introduce a novel model for collective-dephasing noise in [Formula: see text]-dimensional space. After that, we construct a multi-particle entangled state to resist the given collective-dephasing noise. Based on the measurement laws of multi-particle entangled state under two different bases, we propose a multipartite quantum key agreement protocol. In this protocol, multiple participants would obtain [Formula: see text]-dimensional secret key even if the quantum channel is influenced by collective-dephasing noise. The security analysis indicates that this protocol can resist both dishonest participant attack and the outsider attacks which include intercept-resend attack and entangle-measure attack. By comparing with the existing QKA protocols, it is clear that our protocol has greater universality from the perspective of dimensionality and number of participants.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":" 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139137509","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
Connection between gravitational and inertial masses of compound objects and the weak equivalence principle 复合物体的引力质量和惯性质量与弱等效原理之间的联系
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-22 DOI: 10.1142/s0217732323501778
A. Silenko
{"title":"Connection between gravitational and inertial masses of compound objects and the weak equivalence principle","authors":"A. Silenko","doi":"10.1142/s0217732323501778","DOIUrl":"https://doi.org/10.1142/s0217732323501778","url":null,"abstract":"The connection between gravitational and inertial masses of compound objects (e.g. nucleons, nuclei, atoms, and molecules) in the presence of rapid internal motions of their constituent parts is considered. The equality of gravitational and inertial masses of such objects confirming the weak equivalence principle is proven provided that their moving constituent parts are confined. The result is very nontrivial because of a substantial difference between particle dynamics in noninertial frames and gravitational fields. Paradoxically, gravitational effects are different for the same particles moving in the closed box and in the free space. The gravitational and inertial masses are equal to the corresponding kinematic masses. In contrast, gravitational masses of ensembles of noninteracting moving particles cannot be introduced because the total gravitational forces acting on these ensembles do not correspond to their kinematic masses.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"12 7","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947678","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
Energy model in Bianchi type-V spacetime via RIF integration techniques 通过 RIF 积分技术建立比安奇 V 型时空中的能量模型
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-18 DOI: 10.1142/s021773232350164x
Shair-a-Yazdan, Muhammad Jawed Iqbal, Mark Hickman
{"title":"Energy model in Bianchi type-V spacetime via RIF integration techniques","authors":"Shair-a-Yazdan, Muhammad Jawed Iqbal, Mark Hickman","doi":"10.1142/s021773232350164x","DOIUrl":"https://doi.org/10.1142/s021773232350164x","url":null,"abstract":"This paper investigates the Noether versus Killing symmetries and their associated conservation laws of Bianchi type-V spacetimes. The study is carried out using the Maple RIFSIMP package, which converts a set of nonlinear differential equations into the reduced involutive form (RIF). This technique generates an RIF tree, where each branch is solved to obtain the explicit forms of Noether symmetries. Separate RIF trees are used to represent each group. We derive a general expression for the Noether symmetry connected to homothety, and then we investigate this Noether symmetry in each separate group. To explore whether dark energy is associated with Bianchi type-V spacetime, we examine the energy density of each spacetime obtained in association with the Ricci scalar. The symmetries of the larger groups, 11- and 17-dimensional, are presented separately in the tables.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":" 35","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138964500","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
Chaplygin gas equation in curvature-matter coupling gravity 曲率-物质耦合引力中的查普利金气体方程
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-14 DOI: 10.1142/s0217732323501705
E. Baffou, P. H. R. S. Moraes, C. G. Assolohou, M. Houndjo
{"title":"Chaplygin gas equation in curvature-matter coupling gravity","authors":"E. Baffou, P. H. R. S. Moraes, C. G. Assolohou, M. Houndjo","doi":"10.1142/s0217732323501705","DOIUrl":"https://doi.org/10.1142/s0217732323501705","url":null,"abstract":"In this paper, we study the Chaplygin gas equation in curvature-matter coupling gravity to describe the observed expansion of the universe. We consider the Chaplygin gas equation of state in terms of the energy density [Formula: see text] and pressure [Formula: see text], by the relationship [Formula: see text] and the curvature-matter coupling gravity as [Formula: see text], where [Formula: see text] is a positive constant, [Formula: see text] and [Formula: see text] denote, respectively, the Ricci scalar and the trace of energy–momentum tensor. Considering the gravitational lagrangian in the form [Formula: see text], where we used two forms of [Formula: see text] and by assuming a perfect fluid as matter source, we determined through the modified Friedmann equations, the corresponding energy and pressure for each model. By using the free parameters of our models, we performed the numerical results of the energy conditions to study its viability. Furthermore, we have derived some cosmological parameters like deceleration parameter and statefinder parameters and graphically investigated the nature of these parameters in Chaplygin gas model.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"46 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139001602","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
T-violation and the dark sector T-violation 和暗部门
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-14 DOI: 10.1142/s0217732323501651
R. Vilela Mendes
{"title":"T-violation and the dark sector","authors":"R. Vilela Mendes","doi":"10.1142/s0217732323501651","DOIUrl":"https://doi.org/10.1142/s0217732323501651","url":null,"abstract":"It is argued, as a working hypothesis, that “normal” and dark matter interactions can only be [Formula: see text]- and [Formula: see text]-violating. One way to implement this idea is to consider that time reversal in dark matter is implemented, not by an antiunitary operator, but by an unitary operator. It is shown how this occurs naturally in the context of complex spacetime with an extended symmetry group.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"6 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975469","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
Conformally flat generalized Ricci recurrent spacetimes and curvature-squared gravity 共形平坦广义利玛窦循环时空与曲率平方引力
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-14 DOI: 10.1142/s0217732323501663
Dipankar Hazra, Uday Chand De
{"title":"Conformally flat generalized Ricci recurrent spacetimes and curvature-squared gravity","authors":"Dipankar Hazra, Uday Chand De","doi":"10.1142/s0217732323501663","DOIUrl":"https://doi.org/10.1142/s0217732323501663","url":null,"abstract":"First, we illustrate that a conformally flat generalized Ricci recurrent spacetime is a perfect fluid spacetime. As a consequence, we prove that such a spacetime represents a dust matter fluid, stiff matter and dark energy era under certain restrictions on the Ricci scalar. Then we establish that such a spacetime is a Robertson–Walker spacetime. Also, we note that in a conformally flat generalized Ricci recurrent spacetime, the fluid is shear-free, vorticity-free and its flow vector is hypersurface orthogonal. We investigate a conformally flat generalized Ricci recurrent spacetime as a solution of curvature-squared gravity theory. In this study, various energy conditions in terms of the Ricci scalar are examined and state that the Universe is in an accelerating phase and satisfies the weak, null, dominant, and strong energy conditions.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"388 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974198","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
Analytical quasibound states of black holes emerging from modified theories of gravity 修正引力理论中出现的黑洞解析准结合态
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-11 DOI: 10.1142/s0217732323501602
David Senjaya
{"title":"Analytical quasibound states of black holes emerging from modified theories of gravity","authors":"David Senjaya","doi":"10.1142/s0217732323501602","DOIUrl":"https://doi.org/10.1142/s0217732323501602","url":null,"abstract":"The Rayleigh–Schrodinger method or more commonly called time independent perturbation theory is a powerful method to solve a Hamiltonian system with a relatively small perturbation [W. Nolting, Theoretical Physics 7: Quantum Mechanics–Methods and Applications (Springer International, 2017); F. Schwabl, Quantum Mechanics, 4th edn. (Springer, 2007)]. In this work, we make use of the Rayleigh–Schrodinger method to formulate a general method to calculate quasibound states of static spherically symmetric black hole solutions arising from modified theories of gravity. We discover that the Schwarzschild-like term corresponds to the main Hamiltonian while the modified theory of gravity’s contribution of the spacetime metric corresponds to the perturbation terms. At the end, formula to calculate main Hamiltonian and perturbed Hamiltonian are discovered and presented.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"54 4","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139010413","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
Thermodynamic geometry of dyonic black holes in AdS in extended phase space 扩展相空间 AdS 中双子黑洞的热力学几何学
IF 1.4 4区 物理与天体物理
Modern Physics Letters A Pub Date : 2023-12-11 DOI: 10.1142/s0217732323501730
Aditya Singh
{"title":"Thermodynamic geometry of dyonic black holes in AdS in extended phase space","authors":"Aditya Singh","doi":"10.1142/s0217732323501730","DOIUrl":"https://doi.org/10.1142/s0217732323501730","url":null,"abstract":"Ruppeiner scalar curvature can be considered as an empirical tool to explore the nature of interaction among the microstructures of black holes. In the extended phase space, the phase transitions and criticality are investigated for the dyonic black holes in an ensemble, where the electric potential [Formula: see text] is fixed. At first, we described the thermodynamic properties of dyonic black holes to investigate the [Formula: see text] criticality. Further, the Ruppeiner scalar curvature is calculated in an ensemble with fixed [Formula: see text] utilizing the fluctuation coordinates [Formula: see text]. The behavior of interactions among the microstructures of the dyonic black holes in AdS is studied where the dominance of attractive or repulsive interaction is found to be dependent on the values of electric potential [Formula: see text].","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"40 7","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139010435","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
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