Pub Date : 1972-11-01DOI: 10.1088/0305-4470/5/11/001
D. Chellone
The Newman-Penrose conserved quantities for the Born-Infield nonlinear electromagnetic theory and the Einstein-Born-Infeld theory are shown to be precisely the same as those for the Maxwell and Einstein-Maxwell theories respectively. It is suggested that this occurrence is due to the particular nature of the nonlinearity of the Born-Infeld field equations.
{"title":"Newman-Penrose conserved quantities in Born-Infeld electrodynamics","authors":"D. Chellone","doi":"10.1088/0305-4470/5/11/001","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/001","url":null,"abstract":"The Newman-Penrose conserved quantities for the Born-Infield nonlinear electromagnetic theory and the Einstein-Born-Infeld theory are shown to be precisely the same as those for the Maxwell and Einstein-Maxwell theories respectively. It is suggested that this occurrence is due to the particular nature of the nonlinearity of the Born-Infeld field equations.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"41 1","pages":"1545-1549"},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80040910","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/002
G. Maugin
Dissipative processes resulting from magnetic spin-crystal lattice and spin-spin interactions are examined from the point of view of modern continuum mechanics in the theory of micromagnetics of deformable media. A formula which generalizes that of Gilbert and Kelley (1953) is derived for deformable solids. The corresponding heat conduction equation is obtained.
{"title":"Remarks on dissipative processes in the continuum theory of micromagnetics","authors":"G. Maugin","doi":"10.1088/0305-4470/5/11/002","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/002","url":null,"abstract":"Dissipative processes resulting from magnetic spin-crystal lattice and spin-spin interactions are examined from the point of view of modern continuum mechanics in the theory of micromagnetics of deformable media. A formula which generalizes that of Gilbert and Kelley (1953) is derived for deformable solids. The corresponding heat conduction equation is obtained.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"92 1","pages":"1550-1563"},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79948221","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/005
S. D. Majumdar
A convenient parametrization for SU(n) which exhibits the chain of subgroups, SU(n-1)SU(n-2)... SU(1), is proposed and the invariant volume element is calculated.
{"title":"Note on the parameters and the volume element of SU(n)","authors":"S. D. Majumdar","doi":"10.1088/0305-4470/5/11/005","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/005","url":null,"abstract":"A convenient parametrization for SU(n) which exhibits the chain of subgroups, SU(n-1)SU(n-2)... SU(1), is proposed and the invariant volume element is calculated.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"41 1","pages":"1573-1577"},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85018225","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/014
B. Crosignani, P. Porto, S. Solimeno
A simple quantum-mechanical model shows a new qualitative feature of the process of second harmonic generation. This feature is the impossibility of complete depletion of the fundamental wave and is not present in the classical description.
{"title":"Quantum effects in second harmonic generation","authors":"B. Crosignani, P. Porto, S. Solimeno","doi":"10.1088/0305-4470/5/11/014","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/014","url":null,"abstract":"A simple quantum-mechanical model shows a new qualitative feature of the process of second harmonic generation. This feature is the impossibility of complete depletion of the fundamental wave and is not present in the classical description.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83774890","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/012
W. Rudziński
A new method is presented for summation of the virial equation of state up to infinity. The method is based on Holleran's unit compressibility law and leads to a new expression for the equation of state, which has promise for the prediction of the first order phase transition.
{"title":"Summation of the virial expansion for the equation of state","authors":"W. Rudziński","doi":"10.1088/0305-4470/5/11/012","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/012","url":null,"abstract":"A new method is presented for summation of the virial equation of state up to infinity. The method is based on Holleran's unit compressibility law and leads to a new expression for the equation of state, which has promise for the prediction of the first order phase transition.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"19 1","pages":"1642-1648"},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78929936","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/009
Sow-Hsin Chen, P. Tartaglia, N. Polonsky-Ostrowsky
The authors propose an alternative scheme for the clipped light intensity correlation measurement which is complementary to the usual scheme as proposed by Jakeman and Pike (1969). The new scheme gives essentially the same statistical accuracy for the linewidth measurement and furthermore, it has some practical advantages when the mean number of counts per sampling time is sufficiently large.
{"title":"A method for the clipped intensity correlation measurement","authors":"Sow-Hsin Chen, P. Tartaglia, N. Polonsky-Ostrowsky","doi":"10.1088/0305-4470/5/11/009","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/009","url":null,"abstract":"The authors propose an alternative scheme for the clipped light intensity correlation measurement which is complementary to the usual scheme as proposed by Jakeman and Pike (1969). The new scheme gives essentially the same statistical accuracy for the linewidth measurement and furthermore, it has some practical advantages when the mean number of counts per sampling time is sufficiently large.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"48 1","pages":"1619-1623"},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78384393","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 : 1972-11-01DOI: 10.1088/0305-4470/5/11/016
M. Kermode
A non-singular, local 1S0 n-p potential is introduced. This potential gives phase shifts for n-p scattering which agree, within experimental error, with the experimental phase shifts.
{"title":"A non-singular, local 1S0 neutron-proton potential","authors":"M. Kermode","doi":"10.1088/0305-4470/5/11/016","DOIUrl":"https://doi.org/10.1088/0305-4470/5/11/016","url":null,"abstract":"A non-singular, local 1S0 n-p potential is introduced. This potential gives phase shifts for n-p scattering which agree, within experimental error, with the experimental phase shifts.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1972-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75744734","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 : 1972-10-01DOI: 10.1088/0305-4470/5/10/009
J. Mahanty, B. Ninham
It is shown that a semiclassical treatment of dispersion forces, based on the dependence of the zero point energy of two oscillators coupled to the electromagnetic field on their distance of separation gives the retarded and nonretarded form of the dispersion forces between them.
{"title":"Dispersion forces between oscillators: a semi-classical treatment","authors":"J. Mahanty, B. Ninham","doi":"10.1088/0305-4470/5/10/009","DOIUrl":"https://doi.org/10.1088/0305-4470/5/10/009","url":null,"abstract":"It is shown that a semiclassical treatment of dispersion forces, based on the dependence of the zero point energy of two oscillators coupled to the electromagnetic field on their distance of separation gives the retarded and nonretarded form of the dispersion forces between them.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"97 1","pages":"1447-1452"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73313665","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 : 1972-10-01DOI: 10.1088/0305-4470/5/10/014
M.Novello, P. Rotelli
A model for the cosmological time dependence of weak interactions is discussed and some experimental tests suggested.
讨论了弱相互作用的宇宙学时间依赖模型，并提出了一些实验检验方法。
{"title":"The cosmological dependence of weak interactions","authors":"M.Novello, P. Rotelli","doi":"10.1088/0305-4470/5/10/014","DOIUrl":"https://doi.org/10.1088/0305-4470/5/10/014","url":null,"abstract":"A model for the cosmological time dependence of weak interactions is discussed and some experimental tests suggested.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"40 1","pages":"1488-1494"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82204707","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 : 1972-10-01DOI: 10.1088/0305-4470/5/10/012
B. W. Keck, J. Taylor
It is shown how to achieve a finite (and unitary and causal) S matrix for a large class of nonderivative nonpolynomial Lagrangians.
给出了如何对一大类非导数非多项式拉格朗日函数求有限的(且是酉的和因果的)S矩阵。
{"title":"On the finiteness of nonderivative nonpolynomial Lagrangians","authors":"B. W. Keck, J. Taylor","doi":"10.1088/0305-4470/5/10/012","DOIUrl":"https://doi.org/10.1088/0305-4470/5/10/012","url":null,"abstract":"It is shown how to achieve a finite (and unitary and causal) S matrix for a large class of nonderivative nonpolynomial Lagrangians.","PeriodicalId":54612,"journal":{"name":"Physics-A Journal of General and Applied Physics","volume":"7 1","pages":"1473-1478"},"PeriodicalIF":0.0,"publicationDate":"1972-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86409148","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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