By numerically solving the Gross-Pitaevskii equation with phenomenological dissipation term, we study the vortex formation properties of a three-dimensional dipolar Bose-Einstein condensate of $^{164}$Dy atoms. We studied the influence of the contact interaction between atoms on the formation mechanism of vortex. We also study how the dipole orientation affects the vortex formation properties and the number of vortices. We find that enhancing the interaction of short-range repulsion interaction or dipolar repulsion interaction can shorten the time to form a stable vortex structure and increase the number of vortices.
{"title":"Vortex Dynamics of a Three-dimensional Dipolar Bose-Einstein Condensate","authors":"Yuan-Sheng Wang","doi":"10.1139/cjp-2023-0055","DOIUrl":"https://doi.org/10.1139/cjp-2023-0055","url":null,"abstract":"By numerically solving the Gross-Pitaevskii equation with phenomenological dissipation term, we study the vortex formation properties of a three-dimensional dipolar Bose-Einstein condensate of $^{164}$Dy atoms. We studied the influence of the contact interaction between atoms on the formation mechanism of vortex. We also study how the dipole orientation affects the vortex formation properties and the number of vortices. We find that enhancing the interaction of short-range repulsion interaction or dipolar repulsion interaction can shorten the time to form a stable vortex structure and increase the number of vortices.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"48 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76225656","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}
{"title":"Correction: Nonclassicality versus quantum non-Gaussianity of photon-subtracted displaced Fock state","authors":"Deepak, A. Chatterjee","doi":"10.1139/cjp-2023-0224","DOIUrl":"https://doi.org/10.1139/cjp-2023-0224","url":null,"abstract":"","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"2007 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78578787","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}
This work investigates the dynamics of a collapsing magnetic string dust and string fluid in the Plank Era via spherically symmetric rainbow geometry. The field equations are modified and solved to obtain the dynamical quantities including mass density, pressure, string tension, and magnetic field strength. These quantities are presented graphically. The energy conditions are computed showing that all the dynamical quantities are associated with physical matter. The distance and moment of apparent horizon formation are computed. The magnetic field is found to affect the distance and moment of the apparent horizon's formation. It accelerates the collapsing process. Further, the dynamical variables are maximum in the collapsing configuration's center leading to compact object (black hole) formation. The probing particle's energy affects all the dynamical variables of the fluid in a direct proportion. This resolves the information paradox as a particle with greater energy grasps the information from a particle with lesser energy and takes it out in the real world.
{"title":"Magnetic String Matter Collapse in Rainbow Gravity","authors":"Ukasha Tasleem, Umber Sheikh","doi":"10.1139/cjp-2023-0061","DOIUrl":"https://doi.org/10.1139/cjp-2023-0061","url":null,"abstract":"This work investigates the dynamics of a collapsing magnetic string dust and string fluid in the Plank Era via spherically symmetric rainbow geometry. The field equations are modified and solved to obtain the dynamical quantities including mass density, pressure, string tension, and magnetic field strength. These quantities are presented graphically. The energy conditions are computed showing that all the dynamical quantities are associated with physical matter. The distance and moment of apparent horizon formation are computed. The magnetic field is found to affect the distance and moment of the apparent horizon's formation. It accelerates the collapsing process. Further, the dynamical variables are maximum in the collapsing configuration's center leading to compact object (black hole) formation. The probing particle's energy affects all the dynamical variables of the fluid in a direct proportion. This resolves the information paradox as a particle with greater energy grasps the information from a particle with lesser energy and takes it out in the real world.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"47 3","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72483469","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}
The aim of this article is to study a problem of thermomechanical deformation in a homogeneous, isotropic, micropolar thermoelastic half-space based on the Moore–Gibson–Thompson heat equation under the influence of nonlocal and hyperbolic two-temperature (HTT) parameters. The problem is formulated for the considered model by reducing the governing equations into 2D and then converting to dimensionless form. Laplace transform and Fourier transform techniques are employed to obtain the system of differential equations. In the transformed domain, the physical quantities like displacement components, stresses, thermodynamic temperature, and conductive temperature are calculated under the specific types of normal force and thermal source at the boundary surface. A numerical inversion technique is used to recuperate the equations in the physical domain to exhibit the influence of nonlocal and HTT in the form of graphs. Particular cases of interest are also discussed in the present problem. The present study finds applications in a wide range of problems in engineering and sciences, control theory, vibration mechanics, and continuum mechanics.
{"title":"Mathematical modelling of micropolar thermoelastic problem with nonlocal and hyperbolic two-temperature based on Moore–Gibson–Thompson heat equation","authors":"Rajneesh Kumar, S. Kaushal, A. Kochar","doi":"10.1139/cjp-2022-0339","DOIUrl":"https://doi.org/10.1139/cjp-2022-0339","url":null,"abstract":"The aim of this article is to study a problem of thermomechanical deformation in a homogeneous, isotropic, micropolar thermoelastic half-space based on the Moore–Gibson–Thompson heat equation under the influence of nonlocal and hyperbolic two-temperature (HTT) parameters. The problem is formulated for the considered model by reducing the governing equations into 2D and then converting to dimensionless form. Laplace transform and Fourier transform techniques are employed to obtain the system of differential equations. In the transformed domain, the physical quantities like displacement components, stresses, thermodynamic temperature, and conductive temperature are calculated under the specific types of normal force and thermal source at the boundary surface. A numerical inversion technique is used to recuperate the equations in the physical domain to exhibit the influence of nonlocal and HTT in the form of graphs. Particular cases of interest are also discussed in the present problem. The present study finds applications in a wide range of problems in engineering and sciences, control theory, vibration mechanics, and continuum mechanics.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"122 29","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72376702","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}
We investigate a few models with various physical elements that could lead to the appearance of celestial bodies with different curvature systems within the background of f(R,G) gravity, where R represents Ricci scalar and G stands for the Gauss-Bonnet curvatures. After formulating f(R,G) field equations in the setting of anisotropic fluid configuration, along with specific metric coefficients, the observational data of Her X-1, 4U1820-30, VeLAX-1, SAXJ1808.4-3068, CenX-3 and PSRJ16142230 are used. Three different gravity models are used to analyze their impact on mathematical modeling. Several physical factors have been illuminated, including energy density, pressure evolutions, energy conditions, stability analysis, the measurement equation of state parameters, matter content, etc. To access the substance of our model, we observed a number of physical factors, and it was discovered that our system does not contain any singularities.
{"title":"Stellar Anisotropic Cluster in f(R,G) Gravity","authors":"M. Ajmal, M. Z. Bhatti","doi":"10.1139/cjp-2023-0102","DOIUrl":"https://doi.org/10.1139/cjp-2023-0102","url":null,"abstract":"We investigate a few models with various physical elements that could lead to the appearance of celestial bodies with different curvature systems within the background of f(R,G) gravity, where R represents Ricci scalar and G stands for the Gauss-Bonnet curvatures. After formulating f(R,G) field equations in the setting of anisotropic fluid configuration, along with specific metric coefficients, the observational data of Her X-1, 4U1820-30, VeLAX-1, SAXJ1808.4-3068, CenX-3 and PSRJ16142230 are used. Three different gravity models are used to analyze their impact on mathematical modeling. Several physical factors have been illuminated, including energy density, pressure evolutions, energy conditions, stability analysis, the measurement equation of state parameters, matter content, etc. To access the substance of our model, we observed a number of physical factors, and it was discovered that our system does not contain any singularities.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"13 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75499114","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}
We use simple spectral perturbation theory to show that the positive partial transpose property is stable under bounded perturbations of the Hamiltonian, for equilibrium states in infinite dimensions. The result holds provided the temperature is high enough, or equivalently, provided the perturbation is small enough.
{"title":"Stability of PPT in equilibrium states","authors":"M. Merkli, Mitch Zagrodnik","doi":"10.1139/cjp-2023-0086","DOIUrl":"https://doi.org/10.1139/cjp-2023-0086","url":null,"abstract":"We use simple spectral perturbation theory to show that the positive partial transpose property is stable under bounded perturbations of the Hamiltonian, for equilibrium states in infinite dimensions. The result holds provided the temperature is high enough, or equivalently, provided the perturbation is small enough.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83088727","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}
Kaneez Fatima, M. Rafique, A. M. Soomro, Mahesh Kumar
This study uses DFT (Density Functional Theory) technique to examine the H2 storage on Li-decorated h-BN monolayer. The results of DFT proven that Li doped h-BN system can hold up to 9H2 with the adsorption energy lie in between -0.31eV to -0.24eV/H2 at ambient condition However, the calculated average adsorption energy for 9H2 is-0.240eV/H2 with hydrogen storage capacity of 5.96 wt. %, which is according to the United States Department of Energy (USDOE). Partial Density of State (PDOS) computed for each configuration to provide additional justifications for the H2 storage on Li-doped h-BN monolayer. The hybridization shows a significant interaction between hydrogen molecules (H2) and Li atom, and most of their hybrid peaks was observed in the energy range from -7.5 eV to -1 eV. Moreover, the H2 desorption simulations achieved via the ab initio molecular dynamics (MD). The computed desorption temperature TD is 306 °K which is a suitable operating temperature. Hence our research demonstrates that Li-doped h-BN is a thermally stable and viable hydrogen storage material for hydrogen storage systems.
本研究采用密度泛函理论(DFT)技术研究了锂修饰的氢氮化硼单层上的氢存储。DFT结果证明，Li掺杂h-BN体系在环境条件下可吸附9H2，吸附能在-0.31eV ~ -0.24eV/H2之间，而根据美国能源部(USDOE)的计算，9H2的平均吸附能为0.240 ev /H2，储氢容量为5.96 wt. %。计算了每种构型的偏态密度(PDOS)，为掺杂锂的h-BN单层上的H2存储提供了额外的理由。结果表明，氢分子(H2)与Li原子之间存在明显的相互作用，其杂化峰主要分布在-7.5 eV ~ -1 eV的能量范围内。此外，通过从头算分子动力学(MD)模拟了H2的解吸过程。计算的解吸温度TD为306°K，是一个合适的操作温度。因此，我们的研究表明，锂掺杂的h-BN是一种热稳定的、可行的储氢材料。
{"title":"Tailoring Hydrogen Adsorption and Desorption Properties of Li doped SV Monolayer h-BN Systems using Ab-Initio Calculations","authors":"Kaneez Fatima, M. Rafique, A. M. Soomro, Mahesh Kumar","doi":"10.1139/cjp-2023-0072","DOIUrl":"https://doi.org/10.1139/cjp-2023-0072","url":null,"abstract":"This study uses DFT (Density Functional Theory) technique to examine the H2 storage on Li-decorated h-BN monolayer. The results of DFT proven that Li doped h-BN system can hold up to 9H2 with the adsorption energy lie in between -0.31eV to -0.24eV/H2 at ambient condition However, the calculated average adsorption energy for 9H2 is-0.240eV/H2 with hydrogen storage capacity of 5.96 wt. %, which is according to the United States Department of Energy (USDOE). Partial Density of State (PDOS) computed for each configuration to provide additional justifications for the H2 storage on Li-doped h-BN monolayer. The hybridization shows a significant interaction between hydrogen molecules (H2) and Li atom, and most of their hybrid peaks was observed in the energy range from -7.5 eV to -1 eV. Moreover, the H2 desorption simulations achieved via the ab initio molecular dynamics (MD). The computed desorption temperature TD is 306 °K which is a suitable operating temperature. Hence our research demonstrates that Li-doped h-BN is a thermally stable and viable hydrogen storage material for hydrogen storage systems.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"61 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83821205","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}
We study Linde's chaotic inflation in Rastall gravity with a homogeneous scalar field. In Einstein's general theory of relativity (GR) Linde obtained chaotic scenario which emerged from chaotic distribution of scalar field satisfying a limiting value of the initial scalar field phi_o > 3 M_P which lies in the quantum gravity. The upper limit on the initial scalar field is obtained for a sufficient inflation to encompass the present universe. In the Rastall gravity the upper limit is reduced depending on the Rastall parameter gamma <1. The upper limit on phi_o is found to increases for 1
{"title":"Chaotic Inflationary Universe in Rastall Gravity","authors":"Priyanka Mandal, B. C. Paul","doi":"10.1139/cjp-2023-0114","DOIUrl":"https://doi.org/10.1139/cjp-2023-0114","url":null,"abstract":"We study Linde's chaotic inflation in Rastall gravity with a homogeneous scalar field. In Einstein's general theory of relativity (GR) Linde obtained chaotic scenario which emerged from chaotic distribution of scalar field satisfying a limiting value of the initial scalar field phi_o > 3 M_P which lies in the quantum gravity. The upper limit on the initial scalar field is obtained for a sufficient inflation to encompass the present universe. In the Rastall gravity the upper limit is reduced depending on the Rastall parameter gamma <1. The upper limit on phi_o is found to increases for 1<gamma <frac{3}{2}. In the later case sufficient inflation is not permitted and the role of curvaton field is explored for an acceptable early chaotic inflation.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82651250","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}
In this paper, we consider a one-loop thermal correction to the g-factors of the ground and low-lying excited states in atomic systems with one valence s electron. As an example, we carried out calculations for Rb and Cs atoms, where optical measurements of transition frequencies set the metrological level of accuracy. With the development of atomic systems as the most accurate tool for spectroscopic experiments, it has become increasingly important to improve the accuracy of measuring the electron g-factor, which is currently at ~10^{-12}. The rapid progress in this field in recent years requires analysis not only of various relativistic, QED and other effects, but also theoretical studies of phenomena stimulated by the external thermal environment. We can expect that the thermal contribution to the g-factor calculated in our work may be of interest in the near future.
{"title":"Thermal contribution to measured g-factors in alkali atoms","authors":"T. Zalialiutdinov, Y. Kozhedub, D. Solovyev","doi":"10.1139/cjp-2023-0068","DOIUrl":"https://doi.org/10.1139/cjp-2023-0068","url":null,"abstract":"In this paper, we consider a one-loop thermal correction to the g-factors of the ground and low-lying excited states in atomic systems with one valence s electron. As an example, we carried out calculations for Rb and Cs atoms, where optical measurements of transition frequencies set the metrological level of accuracy. With the development of atomic systems as the most accurate tool for spectroscopic experiments, it has become increasingly important to improve the accuracy of measuring the electron g-factor, which is currently at ~10^{-12}. The rapid progress in this field in recent years requires analysis not only of various relativistic, QED and other effects, but also theoretical studies of phenomena stimulated by the external thermal environment. We can expect that the thermal contribution to the g-factor calculated in our work may be of interest in the near future.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"37 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72987323","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}
Ying Zhang, Ruifeng Gao, Yuwei Tu, Yichen Huang, Zhaoqing Ke
The motion of droplet on surface with discontinuous wetting gradient is of great importance for understanding lab-on-a-chip systems and other microfluidic devices. Different wetting gradients are known to be the main influencing factor in the droplet self- driven process, but the effect of different wall structures on the droplet migration process also deserves further investigation. In this paper, we analyze the self-driven process of liquid droplets on a local wetting gradient surface under microgravity conditions using front tracking method. The effects of different driving stripe lengths L_ΙΙx^*, different restrictive stripe lengths L_ΙΙΙy^*, and different surface wetting gradients ∆ cosθ on the droplet migration process and droplet morphology are analyzed. A theoretical formula that can predict the lateral spreading length of droplets is also proposed. The results show that different driving stripe length L_ΙΙx^* lengths and the wetting gradient ∆ cosθ have significant effects on the migration velocity of droplets, while different restrictive stripe length L_ΙΙΙy^* lengths have very significant effects on the final morphological characteristics of droplets. When restrictive stripe length L_ΙΙΙy^*≥1, the hindering effect generated by the restrictive region ΙΙΙ has more and more significant effects on the morphological structure of droplets in the migration process. When the correction factor ε=0.735 in the prediction equation, the predicted value calculated by the theoretical equation has a good degree of similarity with the numerical simulation results.
{"title":"Numerical Simulation Study of Self-driven Microdroplet on Locally Restrictive Discontinuous Wetting Gradient Surface Using Front Tracking Method","authors":"Ying Zhang, Ruifeng Gao, Yuwei Tu, Yichen Huang, Zhaoqing Ke","doi":"10.1139/cjp-2023-0009","DOIUrl":"https://doi.org/10.1139/cjp-2023-0009","url":null,"abstract":"The motion of droplet on surface with discontinuous wetting gradient is of great importance for understanding lab-on-a-chip systems and other microfluidic devices. Different wetting gradients are known to be the main influencing factor in the droplet self- driven process, but the effect of different wall structures on the droplet migration process also deserves further investigation. In this paper, we analyze the self-driven process of liquid droplets on a local wetting gradient surface under microgravity conditions using front tracking method. The effects of different driving stripe lengths L_ΙΙx^*, different restrictive stripe lengths L_ΙΙΙy^*, and different surface wetting gradients ∆ cosθ on the droplet migration process and droplet morphology are analyzed. A theoretical formula that can predict the lateral spreading length of droplets is also proposed. The results show that different driving stripe length L_ΙΙx^* lengths and the wetting gradient ∆ cosθ have significant effects on the migration velocity of droplets, while different restrictive stripe length L_ΙΙΙy^* lengths have very significant effects on the final morphological characteristics of droplets. When restrictive stripe length L_ΙΙΙy^*≥1, the hindering effect generated by the restrictive region ΙΙΙ has more and more significant effects on the morphological structure of droplets in the migration process. When the correction factor ε=0.735 in the prediction equation, the predicted value calculated by the theoretical equation has a good degree of similarity with the numerical simulation results.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"4 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82000372","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}
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