Pub Date : 2022-01-01DOI: 10.31349/revmexfise.19.010211
Julio Herrera Velázquez
The Grad-Shafranov equation, often written in cylindrical coordinates, is an elliptic partial differential equation in two dimensions. It describes magnetohydrodynamic equilibria in axisymmetric toroidal plasmas, such as tokamaks, and yields the poloidal magnetic flux function, which is related to the azimuthal component of the vector potential for the magnetic field produced by a circular (toroidal) current density. The Green function for the differential operator can be obtained from the vector potential for the magnetic field of a circular current loop, which is a typical problem in magnetostatics. The purpose of the paper is to collect results scattered in electrodynamics and plasma physics textbooks for the benefit of students in the field, as well as attracting the attention of a wider audience, in the context of electrodynamics and partial differential equations.
{"title":"Green function for the Grad-Shafranov operator","authors":"Julio Herrera Velázquez","doi":"10.31349/revmexfise.19.010211","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010211","url":null,"abstract":"The Grad-Shafranov equation, often written in cylindrical coordinates, is an elliptic partial differential equation in two dimensions. It describes magnetohydrodynamic equilibria in axisymmetric toroidal plasmas, such as tokamaks, and yields the poloidal magnetic flux function, which is related to the azimuthal component of the vector potential for the magnetic field produced by a circular (toroidal) current density. The Green function for the differential operator can be obtained from the vector potential for the magnetic field of a circular current loop, which is a typical problem in magnetostatics. The purpose of the paper is to collect results scattered in electrodynamics and plasma physics textbooks for the benefit of students in the field, as well as attracting the attention of a wider audience, in the context of electrodynamics and partial differential equations.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42560932","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}
Pub Date : 2022-01-01DOI: 10.31349/revmexfise.19.010209
Umrotul Umrotul, Aurelia Astria L. Jewaru, Senot Kusairi, N. A. Pramono
The aim of this study is to analyze the ability of students to solve the problems of linear motion kinematics expressed in symbolic and numeric representation. Research was survey with cross-sectional design. Research subjects included 26 first year undergraduate students in physics at one of the State Universities in Malang which was consisted of 10 men and 16 women. The research instrument was open-ended test of linear motion kinematics problems expressed in symbolic and numeric representations with a reability of 0,807 The research data were analyzed using descriptive and non-parametric inferential statistics. The results showed that the ability of students to solve linear motion kinematics problems in both symbolic and numeric representation was medium. Students had difficulty solving physical problems in both symbolic and numeric representations. It was also found that the problems of linear motion kinematics in symbolic representations were more difficult for students to solve than numeric representations. The study suggested further research to explore the causes of student difficulties more authentically, e.g. by interviewing or thinking aloud.
{"title":"The ability to solve physics problems in symbolic and numeric representations","authors":"Umrotul Umrotul, Aurelia Astria L. Jewaru, Senot Kusairi, N. A. Pramono","doi":"10.31349/revmexfise.19.010209","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010209","url":null,"abstract":"The aim of this study is to analyze the ability of students to solve the problems of linear motion kinematics expressed in symbolic and numeric representation. Research was survey with cross-sectional design. Research subjects included 26 first year undergraduate students in physics at one of the State Universities in Malang which was consisted of 10 men and 16 women. The research instrument was open-ended test of linear motion kinematics problems expressed in symbolic and numeric representations with a reability of 0,807 The research data were analyzed using descriptive and non-parametric inferential statistics. The results showed that the ability of students to solve linear motion kinematics problems in both symbolic and numeric representation was medium. Students had difficulty solving physical problems in both symbolic and numeric representations. It was also found that the problems of linear motion kinematics in symbolic representations were more difficult for students to solve than numeric representations. The study suggested further research to explore the causes of student difficulties more authentically, e.g. by interviewing or thinking aloud.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41699669","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}
Pub Date : 2021-11-25DOI: 10.31349/revmexfise.19.010207
H. Putranta, H. Kuswanto, Mami Hajaroh, Siti Irene Astuti Dwiningrum, Rukiyati
Physics learning during the Covid-19 pandemic must still be done so that students can still get physics intake. This phenomenological research aims to explore physics teacher strategies in conducting traditional game-based learning in senior high schools during the Covid-19 pandemic. The research data was collected through in-depth interviews with 10 physics teachers from five senior high schools in Yogyakarta. The ten participants were taken using the purposive sampling technique. The data analysis used analytic reduction which started with identifying important statements from the interview results, determining the core theme, and interpreting the physics learning strategy essence. The research results found that traditional game-based physics learning was carried out using contextual, inquiry, project, and problem-based learning models. The physics material is integrated into traditional games which include tulup, benthik, bekelan, sulamanda, egrang, sekongan, jeblugan, and gobak sodor. Physics learning evaluation is carried out by assessing assignments, performance, presentations, tests, and the results of making students' traditional games. Traditional game-based physics learning is done through distance learning applications such as Zoom, Google Meet, Google Classroom, Google Mail, and WhatsApp. Supporting factors for learning physics based on traditional games include efficient learning, learning can be done anywhere, and students can explore their abilities widely. Inhibiting factors for learning physics based on traditional games include unstable internet networks, students’ different abilities, and never done distance learning. The physics teacher’s competence, the student’s abilities, and the facilities availability are the main factors in determining the learning physics success based on traditional games during the Covid-19 pandemic.
{"title":"Strategies of Physics Learning Based on Traditional Games in Senior High Schools during the Covid-19 Pandemic","authors":"H. Putranta, H. Kuswanto, Mami Hajaroh, Siti Irene Astuti Dwiningrum, Rukiyati","doi":"10.31349/revmexfise.19.010207","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010207","url":null,"abstract":"Physics learning during the Covid-19 pandemic must still be done so that students can still get physics intake. This phenomenological research aims to explore physics teacher strategies in conducting traditional game-based learning in senior high schools during the Covid-19 pandemic. The research data was collected through in-depth interviews with 10 physics teachers from five senior high schools in Yogyakarta. The ten participants were taken using the purposive sampling technique. The data analysis used analytic reduction which started with identifying important statements from the interview results, determining the core theme, and interpreting the physics learning strategy essence. The research results found that traditional game-based physics learning was carried out using contextual, inquiry, project, and problem-based learning models. The physics material is integrated into traditional games which include tulup, benthik, bekelan, sulamanda, egrang, sekongan, jeblugan, and gobak sodor. Physics learning evaluation is carried out by assessing assignments, performance, presentations, tests, and the results of making students' traditional games. Traditional game-based physics learning is done through distance learning applications such as Zoom, Google Meet, Google Classroom, Google Mail, and WhatsApp. Supporting factors for learning physics based on traditional games include efficient learning, learning can be done anywhere, and students can explore their abilities widely. Inhibiting factors for learning physics based on traditional games include unstable internet networks, students’ different abilities, and never done distance learning. The physics teacher’s competence, the student’s abilities, and the facilities availability are the main factors in determining the learning physics success based on traditional games during the Covid-19 pandemic.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46814766","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}
Pub Date : 2021-11-23DOI: 10.31349/revmexfise.19.010301
Victor Manuel Trejos Montoya, L. Peralta, Lao Tsé López-Lozano, Mario Pérez-González, Selim Gómez-Ávila
Un falso positivo en la ciencia, es un descubrimiento anunciado y luego rebatido; la historia de los falsos positivos ilustra el proceso científico y la cultura en la cuál éste está inmerso. En el anuncio de un descubrimiento falso juegan tanto las fluctuaciones estadísticas como los errores sistemáticos de los experimentos, la ambición de los científicos, y las expectativas y esperanzas de las comunidades investigadoras. También las prácticas y los estándares de revisión; en el camino a la construcción de un consenso científico hay obstáculos tanto de carácter social como metodológico. En el caso particular de las matemáticas tenemos el caso de la prueba fallida, en donde un error lógico o conceptual lleva al anuncio de un resultado correcto al que se llega por un argumento erróneo. En este trabajo se discute la historia de las demostraciones fallidas en matemáticas tal como es el caso de Vladimir Voevodsky, la controversia sobre el efecto Mpemba, el fiasco del exceso de difotones a 750 GeV en el Gran Colisionador de Hadrones, y el caso de deshonestidad científica de Jan Hendrik Schön.
科学中的假阳性，是一个宣布的发现，然后被反驳；假阳性的历史说明了它所处的科学过程和文化。在宣布虚假发现时，实验的统计波动和系统误差、科学家的雄心以及研究界的期望和希望都起着作用。审查做法和标准；在建立科学共识的道路上，存在社会和方法上的障碍。在数学的特殊情况下，我们有失败的测试案例，在这种情况下，逻辑或概念上的错误会导致宣布正确的结果，而错误的论点会得出正确的结果。本文讨论了弗拉基米尔·沃沃沃夫斯基（Vladimir Voevodsky）的数学证明失败的历史，关于MPEMBA效应的争议，大型强子对撞机750 GeV下过量双光子的惨败，以及扬·亨德里克·舍恩（Jan Hendrik Schön）的科学不诚实案。
{"title":"Falsos Positivos de la ciencia.","authors":"Victor Manuel Trejos Montoya, L. Peralta, Lao Tsé López-Lozano, Mario Pérez-González, Selim Gómez-Ávila","doi":"10.31349/revmexfise.19.010301","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010301","url":null,"abstract":"Un falso positivo en la ciencia, es un descubrimiento anunciado y luego rebatido; la historia de los falsos positivos ilustra el proceso científico y la cultura en la cuál éste está inmerso. En el anuncio de un descubrimiento falso juegan tanto las fluctuaciones estadísticas como los errores sistemáticos de los experimentos, la ambición de los científicos, y las expectativas y esperanzas de las comunidades investigadoras. También las prácticas y los estándares de revisión; en el camino a la construcción de un consenso científico hay obstáculos tanto de carácter social como metodológico. En el caso particular de las matemáticas tenemos el caso de la prueba fallida, en donde un error lógico o conceptual lleva al anuncio de un resultado correcto al que se llega por un argumento erróneo. En este trabajo se discute la historia de las demostraciones fallidas en matemáticas tal como es el caso de Vladimir Voevodsky, la controversia sobre el efecto Mpemba, el fiasco del exceso de difotones a 750 GeV en el Gran Colisionador de Hadrones, y el caso de deshonestidad científica de Jan Hendrik Schön.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47939325","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}
Pub Date : 2021-11-22DOI: 10.31349/revmexfise.19.010204
S. A. de Souza Farias, D. P. Meira Filho, J. K. Santos Kamassury
Notions of Electromagnetism and Special Theory of Relativity (STR) require important mathematical knowledge applied to theoretical physics. Recognizing pedagogical difficulties in the teaching of theoretical physics, the Theory of Didactical Situations (TDS), which consists of a set of practices that aim to contribute to the improvement of mathematics teaching. In this context, the present work is motivated to present a set of practices based on TDS with a focus on teaching Electromagnetism and STR, where problems that require an understanding of the transformations of Galileo and Lorentz. Specifically, the didactic situation is constructed by means of four problem proposals, while in the adidatic situation, the student is invited to understand the roles of these transformations in the study of these problems. Ultimately, the relevance of the educator in the institutionalization situation is reinforced, a moment when it must be clarified how all mathematical relations are strongly related to physical principles.
{"title":"Didactical situations to treat Lorentz and Galileo transformations in theoretical physics","authors":"S. A. de Souza Farias, D. P. Meira Filho, J. K. Santos Kamassury","doi":"10.31349/revmexfise.19.010204","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010204","url":null,"abstract":"Notions of Electromagnetism and Special Theory of Relativity (STR) require important mathematical knowledge applied to theoretical physics. Recognizing pedagogical difficulties in the teaching of theoretical physics, the Theory of Didactical Situations (TDS), which consists of a set of practices that aim to contribute to the improvement of mathematics teaching. In this context, the present work is motivated to present a set of practices based on TDS with a focus on teaching Electromagnetism and STR, where problems that require an understanding of the transformations of Galileo and Lorentz. Specifically, the didactic situation is constructed by means of four problem proposals, while in the adidatic situation, the student is invited to understand the roles of these transformations in the study of these problems. Ultimately, the relevance of the educator in the institutionalization situation is reinforced, a moment when it must be clarified how all mathematical relations are strongly related to physical principles.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45204142","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}
Pub Date : 2021-11-22DOI: 10.31349/revmexfise.19.010206
P. Wattanakasiwich, P. Kongkhumbod, N. Pussadee
This paper provided physics principles and a method to heating up a lantern with a tealight candle, so it reaches 2.5 m within the shortest time. The experiments aimed to determine optimal parameters in filling paper lanterns with hot air and the ideal shape of lanterns that would travel most quickly in a vertical direction. Hot air from burning a 28-wick candle was directed through a heat transfer system to fill the lanterns. The small ellipsoid lantern required the shortest time. This problem is suitable as a platform for STEM education approach on topics of convection, buoyancy and drag force.
{"title":"Heating up a lantern with a tealight candle","authors":"P. Wattanakasiwich, P. Kongkhumbod, N. Pussadee","doi":"10.31349/revmexfise.19.010206","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010206","url":null,"abstract":"This paper provided physics principles and a method to heating up a lantern with a tealight candle, so it reaches 2.5 m within the shortest time. The experiments aimed to determine optimal parameters in filling paper lanterns with hot air and the ideal shape of lanterns that would travel most quickly in a vertical direction. Hot air from burning a 28-wick candle was directed through a heat transfer system to fill the lanterns. The small ellipsoid lantern required the shortest time. This problem is suitable as a platform for STEM education approach on topics of convection, buoyancy and drag force.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42659267","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}
Pub Date : 2021-11-22DOI: 10.31349/revmexfise.19.010205
Axi Aguilera, P. Castillo, Sergio Gómez
Se presenta un método en tiempo para aproximar la solución de una clase de sistemas de ecuaciones no lineales de Schrödinger, el cual conserva la potencia de cada componente y el Hamiltoniano del sistema de manera exacta. Para la discretización espacial se consideran fórmulas explı́citas y compactas de diferencias finitas, ambas de cuarto y sexto orden, sin embargo fórmulas de mayor orden también podrı́an ser utilizadas. La técnica para avanzar en tiempo se basa en unamodificación del esquema conservativo de Crank-Nicolson, la cual se aplica de manera secuencial a cada una de las componentes del campo vectorial. La conservación de los invariantes discretos y el orden de convergencia del método se validan por medio de una serie de experimentos numéricosutilizando diferentes potenciales no lineales.
{"title":"Método conservativo de diferencias finitas de alto orden para una clase de sistemas de Schrödinger no lineales","authors":"Axi Aguilera, P. Castillo, Sergio Gómez","doi":"10.31349/revmexfise.19.010205","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010205","url":null,"abstract":"Se presenta un método en tiempo para aproximar la solución de una clase de sistemas de ecuaciones no lineales de Schrödinger, el cual conserva la potencia de cada componente y el Hamiltoniano del sistema de manera exacta. Para la discretización espacial se consideran fórmulas explı́citas y compactas de diferencias finitas, ambas de cuarto y sexto orden, sin embargo fórmulas de mayor orden también podrı́an ser utilizadas. La técnica para avanzar en tiempo se basa en unamodificación del esquema conservativo de Crank-Nicolson, la cual se aplica de manera secuencial a cada una de las componentes del campo vectorial. La conservación de los invariantes discretos y el orden de convergencia del método se validan por medio de una serie de experimentos numéricosutilizando diferentes potenciales no lineales.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44859463","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}
Pub Date : 2021-11-09DOI: 10.31349/revmexfise.19.010202
César Jiménez, I. Campos-Cantón, L. J. Ontanon-Garcia
This article provides undergraduates a useful tool for a better understanding of the time delay eect on a electronic circuit. The time delay eect is analyzed on this paper in a rst order dierential equation. This linear time delay is associated with the amplitude of a first-order dierential equation and is responsible of three responses: one of the responses is an dierential equation type in first-order without delay, another one of the responses is a dierential equation type in second-order and nally we have the response of a harmonic oscillator.The proposed circuit is an emulator that develop the three different responses mentioned above. Simulink-Matlab software was used to implement the time delay and simulate the dierential equation. This simulation results coincide with the theoretical results. In the same manner, the experimental results match those of the theory. The electronical circuits suggested consist of three blocks: an integrator block, a phase shift block and a gain block. The electrical circuit is composed of resistors, capacitors and operational ampliers.
{"title":"Electronic Circuit Emuling a First-order Time-delay Differential Equation","authors":"César Jiménez, I. Campos-Cantón, L. J. Ontanon-Garcia","doi":"10.31349/revmexfise.19.010202","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010202","url":null,"abstract":"This article provides undergraduates a useful tool for a better understanding of the time delay eect on a electronic circuit. The time delay eect is analyzed on this paper in a rst order dierential equation. This linear time delay is associated with the amplitude of a first-order dierential equation and is responsible of three responses: one of the responses is an dierential equation type in first-order without delay, another one of the responses is a dierential equation type in second-order and nally we have the response of a harmonic oscillator.The proposed circuit is an emulator that develop the three different responses mentioned above. Simulink-Matlab software was used to implement the time delay and simulate the dierential equation. This simulation results coincide with the theoretical results. In the same manner, the experimental results match those of the theory. The electronical circuits suggested consist of three blocks: an integrator block, a phase shift block and a gain block. The electrical circuit is composed of resistors, capacitors and operational ampliers.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41816758","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}
Pub Date : 2021-08-07DOI: 10.31349/revmexfise.19.010201
P. Chudinov
The influence of the force of the quadratic resistance of the medium on the change in some interesting characteristics of the motion of the projectile, which take place when the projectile moves in vacuum, is investigated. Loci are constructed numerically (and partly analytically) that ensures maximization of the arc length of the projectile trajectory and a non-decreasing of the length of the radius-vector. As examples, the motion of a baseball, a tennis ball and a badminton shuttlecock is studied.
{"title":"Some problems of the projectile motion with a square-law resistance","authors":"P. Chudinov","doi":"10.31349/revmexfise.19.010201","DOIUrl":"https://doi.org/10.31349/revmexfise.19.010201","url":null,"abstract":"The influence of the force of the quadratic resistance of the medium on the change in some interesting characteristics of the motion of the projectile, which take place when the projectile moves in vacuum, is investigated. Loci are constructed numerically (and partly analytically) that ensures maximization of the arc length of the projectile trajectory and a non-decreasing of the length of the radius-vector. As examples, the motion of a baseball, a tennis ball and a badminton shuttlecock is studied.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47303635","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}
Pub Date : 2021-07-02DOI: 10.31349/revmexfise.18.020209
H. Rojas, Jorge Luis Acosta Ávalo
The problem of photon propagation in a medium in presence of a strong magnetic field in the frame of quantum electrodynamics is discussed in the present paper, based on previous literature in this area. The breaking of the spatial symmetry by the magnetic field determine the existence of a set of basic vectors and tensors which must satisfy the gauge and CPT invariance of quantum electrodynamics. The charge symmetric and non-symmetric cases are discussed. In the second case the Faraday effect is produced. A chiral current arises, associated to a pseudovector eigenvector ofthe polarization operator (due to the breaking of the spatial symmetry by the external magnetic field), related to the so-called axial anomaly. The path integrals and functional derivation are widely used to obtain the self-energy and vertex operators, and the Dyson equations. The inadequate introduction of a chiral chemical potential in the standard model is discussed for the Weinberg-Salam model for electroweak interactions.
{"title":"Strong magnetic fields in gauge theories","authors":"H. Rojas, Jorge Luis Acosta Ávalo","doi":"10.31349/revmexfise.18.020209","DOIUrl":"https://doi.org/10.31349/revmexfise.18.020209","url":null,"abstract":"The problem of photon propagation in a medium in presence of a strong magnetic field in the frame of quantum electrodynamics is discussed in the present paper, based on previous literature in this area. The breaking of the spatial symmetry by the magnetic field determine the existence of a set of basic vectors and tensors which must satisfy the gauge and CPT invariance of quantum electrodynamics. The charge symmetric and non-symmetric cases are discussed. In the second case the Faraday effect is produced. A chiral current arises, associated to a pseudovector eigenvector ofthe polarization operator (due to the breaking of the spatial symmetry by the external magnetic field), related to the so-called axial anomaly. The path integrals and functional derivation are widely used to obtain the self-energy and vertex operators, and the Dyson equations. The inadequate introduction of a chiral chemical potential in the standard model is discussed for the Weinberg-Salam model for electroweak interactions.","PeriodicalId":49600,"journal":{"name":"Revista Mexicana De Fisica E","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45317498","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}
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