S P Misra
Articles written in Pramana – Journal of Physics
Volume 20 Issue 5 May 1983 pp 375-385 Particle Physics
The charge correlations and the local charge compensation mechanism in rapidity space for quark jets are analysed in the framework of the quark-cascade jet-production model. The calculated results are compared with those observed experimentally in antineutrino-nucleon processes, and for the short range charge correlations observed in
Volume 24 Issue 4 April 1985 pp 595-600 Quantum Mechanics
We use Schwinger’s action principle in quantum mechanics to obtain the quantisation from Lagrangian for the fermionic variables, as well as when it contains auxiliary coordinates. We illustrate this with a supersymmetric Lagrangian which naturally includes auxiliary variables. We further show that the action principle also leads to Feynman’s path integral quantisation, which is aesthetically pleasing.
Volume 25 Issue 4 October 1985 pp 353-361 Relativity And Gravitation
We give here a review of the recent developments of grand unified theories based on
Volume 27 Issue 4 October 1986 pp 523-536 Particle Physics
We consider here a variational method for describing composite particles. We use equal time anticommutators/commutators, and regard the field operators as arbitrary except for the constraint from the above. The expectation value of the Hamiltonian is extremized both with respect to the field operators and with respect to the wave functions, the former extremization being the new feature here. Comparison with other calculations has been made, and correspondence with them has also been established. We further show here how an “effective mass” can arise from a potential.
Volume 28 Issue 2 February 1987 pp 131-158 Particle Physics
The meson masses are considered to retain total relativistic effects for spinors instead of Fermi-Breit approximation. This necessitates a diagonalization approach instead of solutions of differential equations. Correction over Fermi-Breit form appears to be significant. For heavy quark systems agreement with experiment is found. The method will be quite useful if the quark-antiquark dynamics becomes sufficiently known.
Volume 32 Issue 4 April 1989 pp 377-388 Self-Consistent Field Theory For Nuclei
We discuss here some non-perturbative techniques of field theory as applied to nuclear physics. We first describe Walecka’s mean field approach and its generalizations with a many-body description. We next apply to nuclear matter a new approach to strongly interacting systems, of which Walecka’s method becomes a specific approximation. The phenomenological implications of the same are also discussed.
Volume 37 Issue 1 July 1991 pp 59-70
We study the vacuum structure in QCD in a nonperturbative manner using a variational approach with gluon condensates. We show that in Coulomb gauge as the coupling becomes moderately strong, the perturbative vacuum of QCD becomes unstable leading to gluon condensates and a gauge dependent effective mass for the gluons related to the gauge independent value of 〈vac‖
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