Zobrazeno 1 - 7
of 7
pro vyhledávání: '"N G Sarkar"'
Autor:
S. Biswas, N. G. Sarkar
Publikováno v:
International Journal of Modern Physics A. 15:497-508
The definition of vacuum in curved space–time is a delicate object. With Minkowski-like vacuum definition, the current has a characteristic behavior in Robertson–Walker space–time. In this work we study the behavior of Dirac current in a de Sit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4c040178a34382b6ef9f1e86c4e117b
https://doi.org/10.1142/s0217751x00000239
https://doi.org/10.1142/s0217751x00000239
Publikováno v:
Pramana. 53:685-700
We study the behaviour of Dirac current in expanding spacetime with Schrodinger and de Sitter form for the evolution of the scale-factor. The study is made to understand the particle-antiparticle rotation and the evolution of quantum vacuum leading t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8211089690f70efe66d76f7101285d38
https://doi.org/10.1007/s12043-999-0104-x
https://doi.org/10.1007/s12043-999-0104-x
Autor:
N G Sarkar, S. Biswas
Publikováno v:
Pramana. 50:109-131
Particle production in curved spacetime has been discussed through the method of complex time WKB approximation. We consider Dirac equation in non-flat spacetime to understand particle production as particle-antiparticle rotation. The method is also
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7a886f19aacdaa24f31174884b08b91
https://doi.org/10.1007/bf02847523
https://doi.org/10.1007/bf02847523
Publikováno v:
Classical and Quantum Gravity. 12:1641-1653
We show that the Dirac equation in Robertson--Walker (RW) spacetime can be written in a two-dimensional equivalent form that parallels the motion of an electron in a time-varying electric field. Using the effect of particle production, a RW spacetime
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::927fa98ccd2e82a83e27847c7a11d500
https://doi.org/10.1088/0264-9381/12/7/007
https://doi.org/10.1088/0264-9381/12/7/007
Publikováno v:
Classical and Quantum Gravity. 12:1591-1607
Partial creation in de Sitter spacetime is studied in a complex-time WKB approximation. It is found that the particle production parallels the description of particle creation by a collapsing spherical body. The appropriate vacuum for an inflationary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09f5681ef2578c540034b9ced1b23f56
https://doi.org/10.1088/0264-9381/12/7/005
https://doi.org/10.1088/0264-9381/12/7/005
Publikováno v:
Pramana. 42:319-332
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::551e469301eda09a582895aeb9b6b10c
https://doi.org/10.1007/bf02847758
https://doi.org/10.1007/bf02847758
Publikováno v:
Pramana. 40:467-476
The non-perturbative method, developed recently, of WKB approximation in complex time is applied to some known curved space time. Three cases namely (1) static in and out region, (2) non-static in and out region, (3) static in and non static out regi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b39623ea72a38360637208300588a613
https://doi.org/10.1007/bf02847133
https://doi.org/10.1007/bf02847133