The paper investigates the effect of initial conditions characterized by compressibility of turbulence on the changes in scalar such as density, temperature and pressure within the framework of rapid distortion theory (RDT) in the case of non-isentropic turbulence. This study is a follow-up of the basic work from the J. Fluid Mech. article 330, 307 (1997) carried out by A. Simone, G.N. Coleman and C. Cambon in the case of quasi-isentropic turbulence and the previous work of M. Riahi and T. Lili from Fluid Dyn. Res. article 52, 025501 (2020) in the case of non-isentropic turbulence. RDT is used to examine the behavior of the root mean square (rms) fluctuations of density, temperature and pressure. The coupling between these rms quantities, the partition factor and the polytropic coefficient are also studied. RDT equations are solved numerically using a code which solves directly evolution equations of two-point spectral correlations for compressible homogeneous sheared non-isentropic turbulence. The RDT analysis is carried out for various initial turbulent Mach number Mt0 ranging from 0.1 to 0.4, and the initial compressible turbulence is to be one of the three states concerning the fraction of kinetic energy χ0: solenoidal (χ0=0), mixed (χ0=0.6) and dilatational (χ0=1) (χ0 is the ratio of the initial dilatational kinetic energy to the initial total kinetic energy). It is shown from this study that the changes in scalars are strongly dependent on the initial conditions. Magnitudes and asymptotic values of rms thermodynamics fluctuations and correlations between these thermodynamics fluctuations depend of Mt0. For large times, the isentropic state of the flow is well observed whatever Mt0 and χ0.
{"title":"A study of initial conditions effects on thermal properties of compressible homogeneous sheared non-isentropic turbulence using rapid distortion theory RDT","authors":"M. Riahi, T. Lili","doi":"10.1139/cjp-2021-0347","DOIUrl":"https://doi.org/10.1139/cjp-2021-0347","url":null,"abstract":"The paper investigates the effect of initial conditions characterized by compressibility of turbulence on the changes in scalar such as density, temperature and pressure within the framework of rapid distortion theory (RDT) in the case of non-isentropic turbulence. This study is a follow-up of the basic work from the J. Fluid Mech. article 330, 307 (1997) carried out by A. Simone, G.N. Coleman and C. Cambon in the case of quasi-isentropic turbulence and the previous work of M. Riahi and T. Lili from Fluid Dyn. Res. article 52, 025501 (2020) in the case of non-isentropic turbulence. RDT is used to examine the behavior of the root mean square (rms) fluctuations of density, temperature and pressure. The coupling between these rms quantities, the partition factor and the polytropic coefficient are also studied. RDT equations are solved numerically using a code which solves directly evolution equations of two-point spectral correlations for compressible homogeneous sheared non-isentropic turbulence. The RDT analysis is carried out for various initial turbulent Mach number Mt0 ranging from 0.1 to 0.4, and the initial compressible turbulence is to be one of the three states concerning the fraction of kinetic energy χ0: solenoidal (χ0=0), mixed (χ0=0.6) and dilatational (χ0=1) (χ0 is the ratio of the initial dilatational kinetic energy to the initial total kinetic energy). It is shown from this study that the changes in scalars are strongly dependent on the initial conditions. Magnitudes and asymptotic values of rms thermodynamics fluctuations and correlations between these thermodynamics fluctuations depend of Mt0. For large times, the isentropic state of the flow is well observed whatever Mt0 and χ0.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"17 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84153150","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}
Tietz potential has several applications in the study of diatomic molecules in the discussing of vibrational states, especially, in the quantum mechanics studies of the oscillations. Tietz potential has multiple forms, one of the Tietz potential forms has four parameters of the spectroscopic fitting. The spectroscopic fitting parameters of the Tietz potential are the Tietz potential equilibrium bond length, the Tietz potential depth, the width of the potential, and the parameter which controls the values as ratio of the depth of the well. This work focuses on finding a formula between the four parameters of the spectroscopic fitting employing some of principles of the statistical mechanics. Based on the derived formula, we discuss the relationship of the equilibrium bond length of Tietz potential interaction as function to the absolute temperature. Based on this discussion, the equilibrium bond length of Tietz potential interaction varies slowly with absolute temperature. Besides, equilibrium bond length of Tietz potential varies linearly with the radius of the particles of the system. Also, the equilibrium bond length of Tietz potential varies with the Tietz potential depth, the width parameter of Tietz potential, and the fourth parameter of the Tietz potential. The formula of the Tietz interaction is applied for five different dimers or molecules. The five considered molecules are Nitrogen dimer, scandium iodine dimer, nitrogen iodine dimer, rubidium hydride dimer, and carbon monoxide molecule. Generally, it is found that the equilibrium bond length of Tietz potential interaction values vary from 1 Angstrom to 5 Angstrom for different absolute temperatures intervals. Besides, it is found that the scandium iodine dimer has the largest value of the equilibrium bond length of Tietz potential interaction, while carbon monoxide dimer has the lowest value of the equilibrium bond length of Tietz potential interaction.
{"title":"A formula of Tietz potential parameters and applying for scandium iodine, nitrogen iodine, rubidium hydride, nitrogen, and carbon monoxide molecules","authors":"Marwan Al-Raeei","doi":"10.1139/cjp-2022-0250","DOIUrl":"https://doi.org/10.1139/cjp-2022-0250","url":null,"abstract":"Tietz potential has several applications in the study of diatomic molecules in the discussing of vibrational states, especially, in the quantum mechanics studies of the oscillations. Tietz potential has multiple forms, one of the Tietz potential forms has four parameters of the spectroscopic fitting. The spectroscopic fitting parameters of the Tietz potential are the Tietz potential equilibrium bond length, the Tietz potential depth, the width of the potential, and the parameter which controls the values as ratio of the depth of the well. This work focuses on finding a formula between the four parameters of the spectroscopic fitting employing some of principles of the statistical mechanics. Based on the derived formula, we discuss the relationship of the equilibrium bond length of Tietz potential interaction as function to the absolute temperature. Based on this discussion, the equilibrium bond length of Tietz potential interaction varies slowly with absolute temperature. Besides, equilibrium bond length of Tietz potential varies linearly with the radius of the particles of the system. Also, the equilibrium bond length of Tietz potential varies with the Tietz potential depth, the width parameter of Tietz potential, and the fourth parameter of the Tietz potential. The formula of the Tietz interaction is applied for five different dimers or molecules. The five considered molecules are Nitrogen dimer, scandium iodine dimer, nitrogen iodine dimer, rubidium hydride dimer, and carbon monoxide molecule. Generally, it is found that the equilibrium bond length of Tietz potential interaction values vary from 1 Angstrom to 5 Angstrom for different absolute temperatures intervals. Besides, it is found that the scandium iodine dimer has the largest value of the equilibrium bond length of Tietz potential interaction, while carbon monoxide dimer has the lowest value of the equilibrium bond length of Tietz potential interaction.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"81 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90807499","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 study the generalized Klein-Gordon oscillator equation under the effects of the violation of Lorentz Symmetry defined by a tensor field (KF)µναβ out of the Standard Model Extension (SME). We consider a possible scenario of the Lorentz-Violating effects with a Cornell-type electric field and a linear magnetic field that contributes a harmonic-type central potential in the relativistic quantum motions of scalar oscillator fields. The bound-states solutions of the wave equation using the parametric Nikiforov-Uvarov method by considering a Coulomband Cornell-type potential form functions are obtained. We see that the eigenvalue solutions get modified by the Lorentz symmetry-breaking effects in comparison to the Landau levels (without Lorentz-Violation effects in flat space)
{"title":"Effects of Lorentz Symmetry Breaking Environment on Generalized Relativistic Quantum Oscillator Field","authors":"F. Ahmed","doi":"10.1139/cjp-2022-0173","DOIUrl":"https://doi.org/10.1139/cjp-2022-0173","url":null,"abstract":"In this paper, we study the generalized Klein-Gordon oscillator equation under the effects of the violation of Lorentz Symmetry defined by a tensor field (KF)µναβ out of the Standard Model Extension (SME). We consider a possible scenario of the Lorentz-Violating effects with a Cornell-type electric field and a linear magnetic field that contributes a harmonic-type central potential in the relativistic quantum motions of scalar oscillator fields. The bound-states solutions of the wave equation using the parametric Nikiforov-Uvarov method by considering a Coulomband Cornell-type potential form functions are obtained. We see that the eigenvalue solutions get modified by the Lorentz symmetry-breaking effects in comparison to the Landau levels (without Lorentz-Violation effects in flat space)","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"155 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76410704","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 Discrete-Time Quantum Walk (DTQW) with step-dependent scattering operator (SDS) is implemented on Quantum Computer (QC). The probabilities of different states, with their respective fidelities are calculated. This is done by generalizing the coin with a rotation gate using the Quantum Gate Model (QGM). The CNOT gates in the shift operator are replaced with the alternative to CNOT gates Rx(π). They are applied on a Quantum Device (QD) and a Quantum Simulator (QS). The fidelities vary around $50%$ and the probability distribution of step-dependent DTQW (SD-DTQW) for the angle π/4 spreads symmetrically, while the step-independent DTQW (SI-DTQW) tends to peak at the one side. The symmetric distribution of probability of SD-DTQW can help in better control of the walk on QS. In the case of angle π/2, the SI-DTQW spreads equally across the states with four peaks, while the SD-DTQW spreads with two peaks to one side. Some other angles are simulated on QS for about 30 steps revealing some interesting features of SD-DTQW.
{"title":"Experimentally Implementing the Step-Dependent Discrete Time Quantum Walk on Quantum Computers","authors":"Luqman Khan, A. Zaman, Rashid Ahmad, S. Khan","doi":"10.1139/cjp-2022-0121","DOIUrl":"https://doi.org/10.1139/cjp-2022-0121","url":null,"abstract":"The Discrete-Time Quantum Walk (DTQW) with step-dependent scattering operator (SDS) is implemented on Quantum Computer (QC). The probabilities of different states, with their respective fidelities are calculated. This is done by generalizing the coin with a rotation gate using the Quantum Gate Model (QGM). The CNOT gates in the shift operator are replaced with the alternative to CNOT gates Rx(π). They are applied on a Quantum Device (QD) and a Quantum Simulator (QS). The fidelities vary around $50%$ and the probability distribution of step-dependent DTQW (SD-DTQW) for the angle π/4 spreads symmetrically, while the step-independent DTQW (SI-DTQW) tends to peak at the one side. The symmetric distribution of probability of SD-DTQW can help in better control of the walk on QS. In the case of angle π/2, the SI-DTQW spreads equally across the states with four peaks, while the SD-DTQW spreads with two peaks to one side. Some other angles are simulated on QS for about 30 steps revealing some interesting features of SD-DTQW.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"23 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72973741","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}
By using the multireference configuration interaction method followed by Davidson correction, the electronic structure of the molecule CaI has been investigated. The potential energy curves, the permanent and transition dipole moment curves, and the spectroscopic parameters of 18 electronic states are investigated for these states along with 111 vibrational levels of the four lowest electronic states. The Franck–Condon factors and the radiative lifetime are calculated for the X2Σ+- (1)2Π transition. For this transition, the vibrational branching ratio, the slowing distance L, and the number of cycles (N) for photon absorption/emission are calculated along with the Doppler and the recoil temperatures. A pre-cooling temperature in a helium buffer gas is studied and a laser cooling scheme is presented. The calculation of these different experimental parameters is crucial to exploring the optimal conditions under which the laser cooling experiment of CaI molecule will be performed.
{"title":"Extensive Theoretical Studies of the Highly Excited Electronic States with the Experimental Parameters Calculation for the Laser Cooling of CaI Molecule","authors":"Sahar Kassem, I. Zeid, M. Korek","doi":"10.1139/cjp-2022-0143","DOIUrl":"https://doi.org/10.1139/cjp-2022-0143","url":null,"abstract":"By using the multireference configuration interaction method followed by Davidson correction, the electronic structure of the molecule CaI has been investigated. The potential energy curves, the permanent and transition dipole moment curves, and the spectroscopic parameters of 18 electronic states are investigated for these states along with 111 vibrational levels of the four lowest electronic states. The Franck–Condon factors and the radiative lifetime are calculated for the X2Σ+- (1)2Π transition. For this transition, the vibrational branching ratio, the slowing distance L, and the number of cycles (N) for photon absorption/emission are calculated along with the Doppler and the recoil temperatures. A pre-cooling temperature in a helium buffer gas is studied and a laser cooling scheme is presented. The calculation of these different experimental parameters is crucial to exploring the optimal conditions under which the laser cooling experiment of CaI molecule will be performed.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"37 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90737514","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}
Contrary to the results of some studies, is online education expected to be as effective as face-to-face education? If this question is answered in the affirmative, how can a design be made for Physics education? This research aims to determine the effectiveness of infographic-assisted physics teaching with collaborative groups in teaching physics subjects online, face-to-face, and coeducational settings. In this research, action research method was used and both qualitative and quantitative findings were analyzed. The sample of the study consists of 168 students studying in one of the high schools in Turkey, where one of the researchers teaches physics. Four different data collection tools were used in the study. These tools are: a five-point Likert-type questionnaire, one consisting of 17 questions and the other 20 questions, an interview form consisting of 4 questions, and rubrics consisting of 6 items. Quantitative findings were evaluated with SPSS and qualitative findings were evaluated with the help of content analysis. According to the results obtained from the research findings, infographic applications in collaborative groups offered in different learning environments such as online, face-to-face, and hybrid learning contribute positively to the development of students’ self-efficacy and social skills for learning physics lessons. Applications carried out with infographic-supported collaborative groups (ISCGs); these applications contributed to the development of physics learning, attitude toward physics lessons, and social skills of students studying in online, face-to-face, and hybrid learning environments. It has been determined that these practices contribute positively to the elimination of academic and social differences among students. On the other hand, when ISCG applications in Physics education are carried out together with online education, which is perceived as disadvantageous, it increases the group responsibilities of the students and enables them to have equal opportunities with the environments where face-to-face education is provided. The technological content of ISCG applications affects the attitudes of high school students positively and ensures their active participation in the activities throughout the process.
{"title":"Infographic applications in cooperative groups in physics teaching","authors":"A. Kumaş, Sabri Kan","doi":"10.1139/cjp-2022-0135","DOIUrl":"https://doi.org/10.1139/cjp-2022-0135","url":null,"abstract":"Contrary to the results of some studies, is online education expected to be as effective as face-to-face education? If this question is answered in the affirmative, how can a design be made for Physics education? This research aims to determine the effectiveness of infographic-assisted physics teaching with collaborative groups in teaching physics subjects online, face-to-face, and coeducational settings. In this research, action research method was used and both qualitative and quantitative findings were analyzed. The sample of the study consists of 168 students studying in one of the high schools in Turkey, where one of the researchers teaches physics. Four different data collection tools were used in the study. These tools are: a five-point Likert-type questionnaire, one consisting of 17 questions and the other 20 questions, an interview form consisting of 4 questions, and rubrics consisting of 6 items. Quantitative findings were evaluated with SPSS and qualitative findings were evaluated with the help of content analysis. According to the results obtained from the research findings, infographic applications in collaborative groups offered in different learning environments such as online, face-to-face, and hybrid learning contribute positively to the development of students’ self-efficacy and social skills for learning physics lessons. Applications carried out with infographic-supported collaborative groups (ISCGs); these applications contributed to the development of physics learning, attitude toward physics lessons, and social skills of students studying in online, face-to-face, and hybrid learning environments. It has been determined that these practices contribute positively to the elimination of academic and social differences among students. On the other hand, when ISCG applications in Physics education are carried out together with online education, which is perceived as disadvantageous, it increases the group responsibilities of the students and enables them to have equal opportunities with the environments where face-to-face education is provided. The technological content of ISCG applications affects the attitudes of high school students positively and ensures their active participation in the activities throughout the process.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82977613","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 the big rip scienario in Swiss-cheese Brane-worlds. The results obtained have been found to be independent of the value of the cosmological constant Λ whether its positive, negative or zero. Negative tension branes are not allowed in the current model. There is a sign flipping in cosmic pressure corresponding to the sign flipping in the deceleration parameter from positive to negative. The evolution of the EOS parameter shows the presence of three phases: the matter dominant decelerating era,The accelerated-Quitessence phase, and the phantom phase. The evolution of the potential and Kinetic term also shows a change of sign. The energy conditions and cosmographic parameters have also been investigated.
{"title":"Big rip in Swiss-cheese Brane-worlds with cosmic transit","authors":"N. Ahmed, M. Fekry, T. M. Kamel","doi":"10.1139/cjp-2022-0338","DOIUrl":"https://doi.org/10.1139/cjp-2022-0338","url":null,"abstract":"We study the big rip scienario in Swiss-cheese Brane-worlds. The results obtained have been found to be independent of the value of the cosmological constant Λ whether its positive, negative or zero. Negative tension branes are not allowed in the current model. There is a sign flipping in cosmic pressure corresponding to the sign flipping in the deceleration parameter from positive to negative. The evolution of the EOS parameter shows the presence of three phases: the matter dominant decelerating era,The accelerated-Quitessence phase, and the phantom phase. The evolution of the potential and Kinetic term also shows a change of sign. The energy conditions and cosmographic parameters have also been investigated.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"150 4","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72473941","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 the Dirac and Klein-Gordon equations, as well as greybody radiation, for the Hayward black hole (BH) spacetime. We first consider the Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. The equations are then separated into angular and radial parts. A pair of one-dimensional Schrödinger like wave equations with effective potentials is obtained from the radial part. In order to examine the behavior of potentials, they are plotted with respect to radial distances. Additionally, the Klein-Gordon equation is considered in the Hayward BH spacetime. At the end, we compute greybody factors for bosons and fermions and our results are shown graphically and discussed.
{"title":"The Dirac and Klein-Gordan equations and Greybody Radiation for the Regular Hayward Black Hole","authors":"A. Al-Badawi","doi":"10.1139/cjp-2022-0075","DOIUrl":"https://doi.org/10.1139/cjp-2022-0075","url":null,"abstract":"We investigate the Dirac and Klein-Gordon equations, as well as greybody radiation, for the Hayward black hole (BH) spacetime. We first consider the Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. The equations are then separated into angular and radial parts. A pair of one-dimensional Schrödinger like wave equations with effective potentials is obtained from the radial part. In order to examine the behavior of potentials, they are plotted with respect to radial distances. Additionally, the Klein-Gordon equation is considered in the Hayward BH spacetime. At the end, we compute greybody factors for bosons and fermions and our results are shown graphically and discussed.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"104 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86658413","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 studied the time evolution of the mutual information after a quantum quench in the strongly coupled field theories. We use a hyperscaling-violating background and generalize the results of Tanhayi (JHEP, 1603, 202 (2016). doi: 10.1007/JHEP03(2016)202) to subregions with unequal lengths. Precisely, we consider two different strips as the entangling regions and use a holographic prescription to obtain the corresponding mutual information due to a time-dependent coupling in the probe sector. In this setup, due to the formation of apparent horizons, the thermalization can happen and we show that in this process the mutual information remains positive; nevertheless, for three entangling regions the corresponding quantity is negative.
{"title":"Quantum quench and time evolution of mutual information with hyperscaling violation","authors":"Zahra Zarrin, M. R. Tanhayi","doi":"10.1139/cjp-2020-0350","DOIUrl":"https://doi.org/10.1139/cjp-2020-0350","url":null,"abstract":"We studied the time evolution of the mutual information after a quantum quench in the strongly coupled field theories. We use a hyperscaling-violating background and generalize the results of Tanhayi (JHEP, 1603, 202 (2016). doi: 10.1007/JHEP03(2016)202) to subregions with unequal lengths. Precisely, we consider two different strips as the entangling regions and use a holographic prescription to obtain the corresponding mutual information due to a time-dependent coupling in the probe sector. In this setup, due to the formation of apparent horizons, the thermalization can happen and we show that in this process the mutual information remains positive; nevertheless, for three entangling regions the corresponding quantity is negative.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"31 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75752551","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}
Atomic clocks form the foundation of international timekeeping and synchronization. At the National Research Council Canada, the NRC-FCs2 fountain clock has been run nearly continuously with minimal interruption since 2020, participating in the steering of International Atomic Time (TAI) through regular submissions of data to the International Bureau of Weights and Measures (BIPM). We describe the design and performance of NRC-FCs2, a caesium fountain clock serving as a primary frequency standard for Canada, and its role in global timekeeping.
{"title":"The Caesium Fountain Clock at the NRC","authors":"Scott Beattie, B. Jian, J. Alcock, M. Gertsvolf","doi":"10.1139/cjp-2022-0175","DOIUrl":"https://doi.org/10.1139/cjp-2022-0175","url":null,"abstract":"Atomic clocks form the foundation of international timekeeping and synchronization. At the National Research Council Canada, the NRC-FCs2 fountain clock has been run nearly continuously with minimal interruption since 2020, participating in the steering of International Atomic Time (TAI) through regular submissions of data to the International Bureau of Weights and Measures (BIPM). We describe the design and performance of NRC-FCs2, a caesium fountain clock serving as a primary frequency standard for Canada, and its role in global timekeeping.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"53 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85229477","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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