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Communications in Theoretical Physics最新文献

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A New Gravitational Theory and Dark Matter Problem 新引力理论与暗物质问题
Communications in Theoretical Physics Pub Date : 2024-03-29 DOI: 10.1088/1572-9494/ad3904
Xiong Zhao, Yongge Ma
{"title":"A New Gravitational Theory and Dark Matter Problem","authors":"Xiong Zhao, Yongge Ma","doi":"10.1088/1572-9494/ad3904","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3904","url":null,"abstract":"\u0000 We propose a new gravitational theory with torsion based on Riemann-Cartan geometry, in which all physical quantities are dynamical. Besides the spacetime metric, the gravitational degrees of freedom in this theory include also the torsion and two scalar fields. The energy-momentum tensor of the matter fields in this theory is also proposed. A spherically symmetric static vacuum solution of the theory is obtained. It turns out that this solution can fit the observational data of the rotation curve outside the stellar disk in the Milky Way. Therefore, the galactic dark matter may just be the gravitational effect of the theory with torsion.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140365957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of one-decoy state SARG04 quantum cryptography protocol in the presence of afterpulse effect 存在后脉冲效应的单诱饵态 SARG04 量子密码协议分析
Communications in Theoretical Physics Pub Date : 2024-03-29 DOI: 10.1088/1572-9494/ad3905
虎 年, Yafeng Nie, Chun-Mei Zhang, Liangliang Lu
{"title":"Analysis of one-decoy state SARG04 quantum cryptography protocol in the presence of afterpulse effect","authors":"虎 年, Yafeng Nie, Chun-Mei Zhang, Liangliang Lu","doi":"10.1088/1572-9494/ad3905","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3905","url":null,"abstract":"\u0000 The SARG04 quantum key distribution protocol can offer enhanced resilience to photon number splitting as contrasted with the BB84 protocol. In this paper, we propose a tight key analysis for the SARG04 protocol, considering the one-decoy method and investigating its performance under the influence of detector afterpulse. Our results reveal that increasing the block size can marginally boost both the secure key rate and the maximum achievable transmission distance. Importantly, we highlight that detector afterpulse is a pivotal element in practical implementation. Our analysis reveals that afterpulsing exerts a more substantial influence on the performance of the SARG04 protocol as opposed to the BB84 protocol. This underscores the necessity of considering afterpulse effects in down-to-earth quantum key distribution systems.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140366915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wormhole solutions under the effect of dark matter in $f(R,L_m)$ gravity 在$f(R,L_m)$引力中暗物质作用下的虫洞解决方案
Communications in Theoretical Physics Pub Date : 2024-03-25 DOI: 10.1088/1572-9494/ad3746
Lakhan V. Jaybhaye, Moreshwar Tayde, P. Sahoo
{"title":"Wormhole solutions under the effect of dark matter in $f(R,L_m)$ gravity","authors":"Lakhan V. Jaybhaye, Moreshwar Tayde, P. Sahoo","doi":"10.1088/1572-9494/ad3746","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3746","url":null,"abstract":"\u0000 In the background of $f(R, L_m)$ gravity, this work investigates three distinct dark matter halo profiles to test the possibility of generalised wormhole geometry within the galactic halo regions. The current study aims to accomplish these goals by examining various dark matter profiles including Universal Rotation Curves (URC), Navarro-Frenk-White (NFW) model-I, and NFW model-II inside two distinct $f(R, L_m)$ gravity models. According to the $f(R, L_m) = frac{R}{2} + L_m^alpha$ model, the DM halo density profiles produce suitable shape functions that meet all the necessary requirements for exhibiting the wormhole geometries with appropriate choice of free parameters. In addition, to examine DM profiles under the $f(R, L_m) = frac{R}{2} + (1 + lambda R)L_m$ model, we consider a specific shape function. Further, we observed that the derived solution from both two models violates the null energy constraints, confirming that the DM supports wormholes to maintain in the galactic halo.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140381818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Escape probability for isotropic emitters near Kerr black hole with astrometric 克尔黑洞附近各向同性发射体的逃逸概率与天体测量
Communications in Theoretical Physics Pub Date : 2024-03-25 DOI: 10.1088/1572-9494/ad3745
韩 雨轩, 庆华 朱, Qing-Guo Huang
{"title":"Escape probability for isotropic emitters near Kerr black hole with astrometric","authors":"韩 雨轩, 庆华 朱, Qing-Guo Huang","doi":"10.1088/1572-9494/ad3745","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3745","url":null,"abstract":"\u0000 The paper investigates the escape probability for isotropic emitters near a Kerr black hole. We propose a new approach to obtain the escape probability in a general manner, going beyond previous case-by-case studies. This approach is based on studies of the black hole shadow with astrometric observable and can be applied to emitters with an arbitrary 4-velocities and locations, even to the emitters outside of the equatorial plane. We also consider representative examples illustrating how escape probabilities vary with distance, velocity, and inclination angle. Overall, this new approach provides an effective method for studying escape probabilities near Kerr black holes.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Stability Behaviors of 5D M-theory Black Objects 论 5D M 理论黑子的稳定性行为
Communications in Theoretical Physics Pub Date : 2024-03-25 DOI: 10.1088/1572-9494/ad3747
Adil Belhaj, Abderrahim Bouhouch
{"title":"On Stability Behaviors of 5D M-theory Black Objects","authors":"Adil Belhaj, Abderrahim Bouhouch","doi":"10.1088/1572-9494/ad3747","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3747","url":null,"abstract":"\u0000 Using $N = 2$ supergravity formalism, we investigate certain behaviors of five dimensional black objects from the compactification of M-theory on a Calabi-Yau three-fold. The manifold has been constructed as the intersection of two homogeneous polynomials of degrees $ (omega+2,1)$ and $ (2,1) $ in a product of two weighted projective spaces given by $ mathbb{WP}^{4}(omega,1,1,1,1) timesmathbb{P}^{1}$. First, we determine the allowed electric charge regions of the BPS and non BPS black holes obtained by wrapping M2-branes on appropriate two cycles in such a proposed Calabi-Yau three-fold. After that, we calculate the entropy of these solutions which takes a maximal value corresponding to $omega=1$ defining the ordinary projective space $mathbb{P}^{4}$. For generic values of $omega$, we show that the non BPS states are unstable. Then, we conduct a similar study of five dimensional black strings. Concerning the allowed magnetic charge regions of the BPS and non BPS black stringy solutions derived from M5-branes on dual divisors, we calculate the tension taking a minimal value for $mathbb{P}^{4}$. By determining the recombination factor, we show that the non-BPS black string states are stable in the allowed regions in the magnetic charge space.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Sasa-Satsuma equation with high-order discrete spectra in space-time solitonic regions: soliton resolution via mixed ∂-Riemann-Hilbert problem 时空孤子区域中具有高阶离散谱的萨萨-萨摩方程：通过混合∂-黎曼-希尔伯特问题解决孤子问题
Communications in Theoretical Physics Pub Date : 2024-03-21 DOI: 10.1088/1572-9494/ad361b
Minghe Zhang, Zhen-Ya Yan
{"title":"The Sasa-Satsuma equation with high-order discrete spectra in space-time solitonic regions: soliton resolution via mixed ∂-Riemann-Hilbert problem","authors":"Minghe Zhang, Zhen-Ya Yan","doi":"10.1088/1572-9494/ad361b","DOIUrl":"https://doi.org/10.1088/1572-9494/ad361b","url":null,"abstract":"\u0000 In this paper, we investigate the Cauchy problem of the Sasa-Satsuma (SS) equation with initial data belonging to the Schwartz space. The SS equation is one of integrable higher-order extensions of the nonlinear Schrödinger equation and admits a 3 × 3 Lax representation. With the aid of the ∂-nonlinear steepest descent method of the mixed¯∂-Riemann-Hilbert problem, we give the soliton resolution and long-time asymptotics for the Cauchy problem of the Sasa-Satsuma equation with the existence of second-order discrete spectra in the space-time solitonic regions.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electricity Resonance-Induced Phase Transition of Water Confined in Nanochannels 纳米通道中封闭水的电共振诱导相变
Communications in Theoretical Physics Pub Date : 2024-03-20 DOI: 10.1088/1572-9494/ad3617
Yunqiu Ma, Zhigao Zhao, Shaoqian Hao, J. Kou, Jiangxing Chen
{"title":"Electricity Resonance-Induced Phase Transition of Water Confined in Nanochannels","authors":"Yunqiu Ma, Zhigao Zhao, Shaoqian Hao, J. Kou, Jiangxing Chen","doi":"10.1088/1572-9494/ad3617","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3617","url":null,"abstract":"\u0000 The phase transition of water molecules in nanochannels under varying external electrical field is studied by molecular dynamics simulations. It is found that the phase transition of water molecules in nanochannels occurs by changing the frequency of the varying electrical field. Water molecules maintain ice phase when the frequency of the varying electrical field is less than 16 THz or greater than 30 THz, and they completely melt at the frequency of varying electrical field of 24 THz. The phenomenon is attributed to the break of the hydrogen bonds when the frequency of the varying electrical field is close to their inherent resonant frequency. Moreover, the study demonstrates that the critical frequency varies with the confined situation. The new mechanism of regulating the phase transition of water molecules in nanochannels revealed in this study provides a perspective for further understanding of the phase transition of water molecules in nanochannels, and has great application potential in anti-icing.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140226105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NONLINEAR SYSTEM DYNAMICS OF CALCIUM AND NITRIC OXIDE DUE TO CELL MEMORY AND SUPERDIFFUSION IN NEURONS 神经元中细胞记忆和超扩散导致的钙和一氧化氮的非线性系统动力学
Communications in Theoretical Physics Pub Date : 2024-03-20 DOI: 10.1088/1572-9494/ad35b4
Anand Pawar, K. Pardasani
{"title":"NONLINEAR SYSTEM DYNAMICS OF CALCIUM AND NITRIC OXIDE DUE TO CELL MEMORY AND SUPERDIFFUSION IN NEURONS","authors":"Anand Pawar, K. Pardasani","doi":"10.1088/1572-9494/ad35b4","DOIUrl":"https://doi.org/10.1088/1572-9494/ad35b4","url":null,"abstract":"\u0000 The integer-order interdependent calcium ([Ca2+]) and nitric oxide (NO) systems are unable to shed light on the influences of the superdiffusion and memory in triggering Brownian motion (BM) in neurons. Therefore, a mathematical model is constructed for the fractional-order nonlinear spatiotemporal systems of [Ca2+] and NO incorporating reaction-diffusion equations in neurons. The two-way feedback process between [Ca2+] and NO systems through calcium feedback on NO production and NO feedback on calcium through cyclic guanosine monophosphate (cGMP) with plasmalemmal [Ca2+]-ATPase (PMCA) was incorporated in the model. The Crank-Nicholson scheme (CNS) with Grunwald approximation along spatial derivatives and L1 scheme along temporal derivatives with Gauss-Seidel (GS) iterations were employed. The numerical outcomes were analyzed to get insights into superdiffusion, buffer, and memory exhibiting BM of [Ca2+] and NO systems. The conditions, events and mechanisms leading to dysfunctions in calcium and NO systems and causing different diseases like Parkinson’s were explored in neurons.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140224077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cauchy matrix approach to three non-isospectral nonlinear Schrödinger equations 三个非等谱非线性薛定谔方程的考奇矩阵方法
Communications in Theoretical Physics Pub Date : 2024-03-20 DOI: 10.1088/1572-9494/ad35b1
Alemu Yilma Tefera, Shangshuai Li, Da-jun Zhang
{"title":"Cauchy matrix approach to three non-isospectral nonlinear Schrödinger equations","authors":"Alemu Yilma Tefera, Shangshuai Li, Da-jun Zhang","doi":"10.1088/1572-9494/ad35b1","DOIUrl":"https://doi.org/10.1088/1572-9494/ad35b1","url":null,"abstract":"\u0000 The paper aims to develop a direct approach, namely, the Cauchy matrix approach, to non-isospectral integrable systems. In the Cauchy matrix approach, the Sylvester equation plays an central role, which defines a dressed Cauchy matrix to provide τ functions for the investigated equations. In this paper, using the Cauchy matrix approach, we derive three non-isospectral nonlinear Schrödinger equations and their explicit solutions. These equations are generically related to time-dependent spectral parameter in the Zakharov-Shabat-Ablowitz-Kaup-Newell-Segur spectral problem. Their solutions are obtained from the solutions of unreduced non-isospectral nonlinear Schrödinger equations through complex reduction. These solutions are analyzed and illustrated to show the non-isospectral effects in dynamics of solitons.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140225624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymmetric 2D diffraction grating via vortex field in an inverted-Y-type atomic system 通过倒 Y 型原子系统中的涡流场实现不对称二维衍射光栅
Communications in Theoretical Physics Pub Date : 2024-03-19 DOI: 10.1088/1572-9494/ad3545
Duo Zhang, Ke Wang, Kunpeng Zhao, Mei Wang, Zhao-Yu Sun
{"title":"Asymmetric 2D diffraction grating via vortex field in an inverted-Y-type atomic system","authors":"Duo Zhang, Ke Wang, Kunpeng Zhao, Mei Wang, Zhao-Yu Sun","doi":"10.1088/1572-9494/ad3545","DOIUrl":"https://doi.org/10.1088/1572-9494/ad3545","url":null,"abstract":"\u0000 We propose a theoretical scheme to realize two-dimensional (2D) diffraction grating in a four-level inverted-Y-type atomic system coupled by a standing-wave (SW) field and a Laguerre-Gaussian (LG) vortex field. Owing to asymmetric spatial modulation of the LG vortex field, the incident probe field can be lopsidedly diffracted into four domains and asymmetric 2D electromagnetically induced grating (EIG) is created. By adjusting the detunings of the probe field and the LG vortex field, the intensities of the LG vortex field and the coherent SW field, as well as the interaction length, the diffraction properties and efficiency can be effectively manipulated. In addition, the effect of the azimuthal parameter on the Fraunhofer diffraction of the probe field is also discussed. The scheme of symmetric 2D diffraction grating may provide a versatile platform for designing quantum devices that require asymmetric light ransmission.","PeriodicalId":508917,"journal":{"name":"Communications in Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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