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Solution for the null-surface formulation in 2+1 dimensions with radiation source 带辐射源的 2+1 维空面公式解法
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-31 DOI: 10.1139/cjp-2023-0256
T. Harriott, J. G. Williams
{"title":"Solution for the null-surface formulation in 2+1 dimensions with radiation source","authors":"T. Harriott, J. G. Williams","doi":"10.1139/cjp-2023-0256","DOIUrl":"https://doi.org/10.1139/cjp-2023-0256","url":null,"abstract":"The null-surface formulation (NSF) of general relativity has three coupled and highly nonlinear eld equations whose solution determines (a family of) null surfaces indicated by the variable u. This variable is one of a set of intrinsic coordinates that are defined in terms of the surfaces. The first of the three field equations is called the main metricity condition, and it is by far the most complicated. This work considers the NSF in 2+1 dimensions and presents a solution that is founded on the following strategy: Simplify the main metricity condition by requiring the uu-component of the metric tensor to be zero and then search for an additively separable solution formed from a sum of separate terms, each term being linked with a term in a certain differential operator ∂ so as to cause a convenient cancellation. The main motivation for this approach is that it may suggest how to find a solution in higher dimensions, where the role of ∂ is played by the eth operator of Newman and Penrose.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477061","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
Effects of magnetic field on spin–orbit-coupled f = 1 spinor condensate in a toroidal trap 磁场对环形陷阱中自旋轨道耦合 f = 1 自旋凝聚子的影响
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-29 DOI: 10.1139/cjp-2023-0282
Qiang Zhao
{"title":"Effects of magnetic field on spin–orbit-coupled f = 1 spinor condensate in a toroidal trap","authors":"Qiang Zhao","doi":"10.1139/cjp-2023-0282","DOIUrl":"https://doi.org/10.1139/cjp-2023-0282","url":null,"abstract":"In this paper, we study the dynamic properties of spin–orbit coupling (SOC) hyperfine f =1 spinor antiferromagnetic Bose–Einstein condensates with the external magnetic field. The condensate is confined in a toroidal trap and the numerical results are obtained based on the multicomponent Gross–Pitaevskii equation. Our results show that, in the presence of SOC, the spin dynamics for zero magnetic field slows with an increase of radius of the torus. However, this process accelerates when the magnetic field is considered. In addition, in this case, the oscillation behavior is almost consistent with the considered maximum radius. In the absence of SOC, the periodicity of spin dynamics vanishes. We also compare the thermalization time for different magnetic fields and radii, which decreases considerably for nonzero magnetic fields with the increase of radius. Furthermore, our analysis suggests that for stronger magnetic field strength the density structure can be regulated. As a consequence, the condensate recovers from the necklace to an annular-shaped state.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140487203","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
Computational and experimental approach for investigation of optical properties of single-crystal MnGa2Se4 研究单晶 MnGa2Se4 光学特性的计算和实验方法
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-24 DOI: 10.1139/cjp-2023-0255
N. Ismayilova, S. Asadullayeva, M. Musayev, D.J. Askerov
{"title":"Computational and experimental approach for investigation of optical properties of single-crystal MnGa2Se4","authors":"N. Ismayilova, S. Asadullayeva, M. Musayev, D.J. Askerov","doi":"10.1139/cjp-2023-0255","DOIUrl":"https://doi.org/10.1139/cjp-2023-0255","url":null,"abstract":"In the presented work, we propose a systematic investigation of the electronic and optical properties of MnGa2Se4 by combining the spectroscopic ellipsometry carried out at room temperature in the spectral range of 1–4 eV and density functional theory (DFT) calculations. Ellipsometric measurements were collected at an incidence angle between 60° and 75° with a 5° step. The optical direct gap energies of MnGa2Se4 were estimated from the linear extrapolation of the absorption coefficients that were verified by band structure calculation. DFT calculation of the imaginary part ɛ shows that first critical point occurs at 2.46 eV and represents the direct optical transition at Γ point. The total magnetic moment of compound is 3.38 mB. The major contribution in total magnetic moment is due to 3 d state of Mn atoms.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139600506","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
DFT+U investigation on high pressure properties of monoclinic CuO 单斜氧化铜高压特性的 DFT+U 研究
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-16 DOI: 10.1139/cjp-2023-0241
Zainab N. Jaf, H. Miran, M. M. Rahman, A. Amri, Zhong-Tao Jiang
{"title":"DFT+U investigation on high pressure properties of monoclinic CuO","authors":"Zainab N. Jaf, H. Miran, M. M. Rahman, A. Amri, Zhong-Tao Jiang","doi":"10.1139/cjp-2023-0241","DOIUrl":"https://doi.org/10.1139/cjp-2023-0241","url":null,"abstract":"This contribution demonstrates density functional theory (DFT) calculations on the optoelectronic properties of monoclinic CuO under high pressures up to 15 GPa. In this account, the experimentally measured indirect band gap energy value of 1.41 eV has theoretically been predicted by tuning the Hubbard parameter (U) values for the partial electronic states. The values of Hubbard parameter correspond to UCu-3d = 8 eV and UO-2p = 4.5 eV. The electronic and optical characteristics were examined under applied pressure and the results reveal development in the band gap values with increasing pressure from (1.41 – 2.01) eV. Total and projected density of states (TDOS and PDOS) for the adopted pressures have been provided and displayed that the major contribution in the valance and conduction bands comes from O-2p and Cu-3d electronic states, correspondingly. The plotted reflectivity data suggests high optical reflectivity magnitudes relatively in the ultraviolet area. The investigated systems under variant pressures manifest rather an excellent absorption coefficient in the ultraviolet area pushing them to be employed in solar cell technologies. Our analyzed results of the wavelength dependent electrical conductivity of the investigated materials confirm the absorptivity behavior in the ultraviolet and small part of visible region of electromagnetic waves (EMW). Finally and most importantly, our obtained results of loss functions for the entire surveyed systems reveal and slight energy loss in a range of EMW including ultraviolet and visible regions.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139619476","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
Observational constraint in f(R, ∇R) gravity model in power-law cosmology 幂律宇宙学中 f（R，∇R）引力模型的观测约束
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-15 DOI: 10.1139/cjp-2023-0122
A. Dixit
{"title":"Observational constraint in f(R, ∇R) gravity model in power-law cosmology","authors":"A. Dixit","doi":"10.1139/cjp-2023-0122","DOIUrl":"https://doi.org/10.1139/cjp-2023-0122","url":null,"abstract":"In this paper, we have considered the flat Friedmann-Lemaître-Robertson-Walker (FRW) model in the framework of f( R, ∇ R) gravity. We have analyzed the significance of bulk viscosity in the f( R, ∇ R) gravity model to study the expansion of the universe. We have considered two bulk viscosity parameterizations and the use of power-law cosmology to constrain the model parameters H0 and q. Using the Bayesian analysis and likelihood function in conjunction with the Markov Chain Monte Carlo method, we obtained the model parameters [Formula: see text] and [Formula: see text]. The behaviors of energy density, bulk viscous pressure, and the effective equation of the state parameter with redshift are investigated in detail. These features demonstrate that the bulk viscosity is a valid candidate for acquiring the negative pressure needed to effectively drive the expansion of the universe. To check the validity of the f( R, ∇ R) model, we also analyze the behavior of energy conditions. The adiabatic squared speed of the sound is used to test the model’s stability. The Om( z) diagnostic is used in the model to identify the quintessence and phantom regions.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139529874","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
Traversable wormhole model with massive gravitons, two fluids, and a variable gravity 具有大质量引力子、两种流体和可变引力的可穿越虫洞模型
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2024-01-11 DOI: 10.1139/cjp-2023-0033
R. El-Nabulsi, Waranont Anukool
{"title":"Traversable wormhole model with massive gravitons, two fluids, and a variable gravity","authors":"R. El-Nabulsi, Waranont Anukool","doi":"10.1139/cjp-2023-0033","DOIUrl":"https://doi.org/10.1139/cjp-2023-0033","url":null,"abstract":"We construct a new cosmological model based on relativistic theory of gravity characterized by massive gravitons. The new Friedmann–Robertson–Walker model is characterized by the presence of a static traversable wormhole, massive gravitons, and a variable gravitational coupling constant. To recover the Bianchi identity, a second cosmic fluid is introduced in the theory. Motivated from cosmic dark radiation phenomenological arguments, which suggest that the dynamical component of dark energy could be dominated by a bath of dark radiation, we assume that the original cosmic fluid is radiative, whereas the new cosmic fluid is phantom. The total equation of state of our model is equal to −1. The new model is characterized by an effective Hubble parameter. The solutions of the dynamical equations reveal an accelerated universe with a scale factor of hyperbolic type which allows the deceleration parameter to change sign from a decelerating phase to an accelerating phase. We have evaluated the deceleration parameter, the jerk and the present day variations of the gravitational constant which agree with astronomical observations.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139626706","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
Potential energy surface and quantum dynamics calculation of SH2-(2A′) based on ab initio scaled external correlation correction 基于 ab initio 比例外部相关性校正的 SH2-(2A′)势能面和量子动力学计算
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-12-15 DOI: 10.1139/cjp-2023-0176
Hongyu Ma, Ning Gu
{"title":"Potential energy surface and quantum dynamics calculation of SH2-(2A′) based on ab initio scaled external correlation correction","authors":"Hongyu Ma, Ning Gu","doi":"10.1139/cjp-2023-0176","DOIUrl":"https://doi.org/10.1139/cjp-2023-0176","url":null,"abstract":"An accurate inter-atomic potential energy surface for ground state of SH2-is reported at the multi-reference configuration interaction level of theory using aug-cc-pVQZ basis set. The calculated ab initio energy points are utilized, after semiempirically correcting the dynamical correlation by the many-body expansion-scaled external correlation method. In order to verify the accuracy of the potential energy surface, molecular reaction dynamics including the relationship between reaction probability and collision energy, thermal rate constant and integral scattering cross section are calculated by using the quantum time-dependent wave packet method. The final results show that our potential energy surface is accurate and the molecular reaction dynamics results are satisfactory, and the accurate potential energy surface and its dynamics results can also lay a foundation for the future experimental research of SH- containing molecules.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999841","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
Vortices in multilayer stacks of Bose–Einstein condensates with tilted dipoles 具有倾斜偶极子的多层玻色-爱因斯坦凝聚物堆栈中的漩涡
IF 1.2 4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-12-12 DOI: 10.1139/cjp-2023-0095
Qiang Zhao
{"title":"Vortices in multilayer stacks of Bose–Einstein condensates with tilted dipoles","authors":"Qiang Zhao","doi":"10.1139/cjp-2023-0095","DOIUrl":"https://doi.org/10.1139/cjp-2023-0095","url":null,"abstract":"In this paper, we consider the formation of vortices in multilayer stacks of Bose–Einstein condensates with tilted dipoles by numerical simulations of the Gross–Pitaevskii equation. Different dependencies of critical rotation frequency (CRF) and optical lattice height, vortex number, and rotation frequency are studied, depending on the direction of the dipole axis and dipole strength. Our results show that the CRF in z = 0 is minimum. When the optical lattice height is gradually increased, the CRF decreases gradually. Reducing of dipole strength in anisotropic dipole–dipole interaction (DDI) favours the formation of vortices, and such decline in isotropic DDI hinders the creation of vortices. The reason for this difference is that the repulsive interaction is favorable and the attractive interaction is disadvantageous for the vortex formation. In addition, we study the first-order correlation function and focus on variation of coherence. For small rotation frequency, the break of coherence occurs earlier in the case of purely repulsive interaction. With an increase in rotation frequency, the coherence concurrently disappears in layer z = 2. Moreover, we also investigate the quenched dynamics, showing that the increase of angular momentum is induced by changing the direction of dipoles and in this process the vortex number remains unchanged.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009887","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
f(G,T) and its Cosmological Implications f(G,T)及其宇宙学意义
4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-11-10 DOI: 10.1139/cjp-2023-0200
Z. Yousaf, M.Z. Bhatti, Timothy Ganesan Andrew, H. Aman
{"title":"f(G,T) and its Cosmological Implications","authors":"Z. Yousaf, M.Z. Bhatti, Timothy Ganesan Andrew, H. Aman","doi":"10.1139/cjp-2023-0200","DOIUrl":"https://doi.org/10.1139/cjp-2023-0200","url":null,"abstract":"A coupled formulation of the Gauss-Bonnet invariant term G and the&#x0D; energy momentum trace T term provide a modified f(G,T) gravity,&#x0D; has been analyzed in this study. The functional form for the&#x0D; f(G,T) gravity has been taken as f(G,T)=αT+ βG<sup>n</sup>,&#x0D; α and β are free parameters. The field equations are&#x0D; produced in general, which then used a dust case to extract a novel&#x0D; Hubble parameter. The stability of the assumed model and explanation&#x0D; for the late time acceleration have been studied by the energy&#x0D; bound. Furthermore, the dynamical variables are used to analyze the&#x0D; behavior of the equation of state parameter by restricting different&#x0D; parameters with respect to the recent observational data. A&#x0D; quintessence-like evolution has been achieved as a result of this&#x0D; study.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092252","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
Détermination des propriétés thermodynamiques d’un plasma d’air contaminé par de la vapeur d’alliage AgSnO2 AgSnO2合金蒸汽污染空气等离子体热力学性质的测定
4区 物理与天体物理
Canadian Journal of Physics Pub Date : 2023-11-10 DOI: 10.1139/cjp-2023-0052
Adijgkiga BANOUGA, Abdoul Karim KAGONE, Wêpari Charles YAGUIBOU, Niéssan KOHIO, Zacharie Koalaga, François ZOUGMORE
{"title":"Détermination des propriétés thermodynamiques d’un plasma d’air contaminé par de la vapeur d’alliage AgSnO2","authors":"Adijgkiga BANOUGA, Abdoul Karim KAGONE, Wêpari Charles YAGUIBOU, Niéssan KOHIO, Zacharie Koalaga, François ZOUGMORE","doi":"10.1139/cjp-2023-0052","DOIUrl":"https://doi.org/10.1139/cjp-2023-0052","url":null,"abstract":"Le succès ou l'échec de la coupure du courant électrique par le disjoncteur dépend fortement des propriétés physico-chimiques de l'arc électrique créé. Dans ce travail, nous nous intéressons aux propriétés thermodynamiques du plasma d’air contaminé par de la vapeur d’alliage d'argent et de dioxyde d'étain. Il s’agit notamment de la masse volumique, de la vitesse du son dans le plasma, de l’enthalpie massique, de la densité d’énergie et de la densité de flux thermique. Elles sont déterminées à l’équilibre thermodynamique dans une gamme de température de 500 K à 20000 K et à la pression atmosphérique. Les résultats obtenus montrent que, pour une même température donnée, la masse volumique augmente lorsque la vapeur d’alliage d’argent et de dioxyde d’étain augmente dans le mélange. La vitesse du son dans le plasma et la capacité calorifique diminuent lorsque la vapeur d’alliage AgSnO2 augmente dans le mélange. Pour une même température donnée, l’enthalpie massique diminue entre 3000 K et 20000 K, avec l’augmentation de vapeur d’alliage AgSnO2. La densité d’énergie et la densité de flux thermique diminuent entre 10000 K et 20000 K, lorsque la vapeur d’alliage AgSnO2 augmente dans le mélange. L’augmentation du pourcentage de la vapeur de contact électrique en AgSnO2, ralentit l’extinction de l’arc électrique créé à l’intérieur du disjoncteur, surtout au-delà de 0,1% de vapeur. Ce ralentissement de l’extinction de l’arc électrique peut entraîner un échec de coupure de courant électrique par le disjoncteur et donc détériorer les performances du disjoncteur à air.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092260","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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