G P Malik
Articles written in Pramana – Journal of Physics
Volume 20 Issue 5 May 1983 pp 429-438 Mathematical Physics
Soliton-like solutions of some nonlinear theories and transformations among them
G P Malik J Subba Rao Gautam Johri
The observation that the soliton-like solutions of a given second-order nonlinear differential equation define the separatrix of the equivalent autonomous system is used to obtain the one-soliton solutions for the
Volume 23 Issue 6 December 1984 pp 703-713 Particle Physics
Bethe-Salpeter equation with the sine-Gordon interaction
An attempt is made to study the interaction Hamiltonian,
Volume 25 Issue 2 August 1985 pp 123-133 Mathematical Physics
G P Malik J Subba Rao Gautam Johri
A virial theorem for solitons derived by Friedberg, Lee and Sirlin is used to reduce a system of second order equations to an equivalent first order set. It is shown that this theorem, when used in conjunction with our earlier observation that soliton-like solutions lie on the separatrix, helps in obtaining soliton-like solutions of theories involving coupled fields. The method is applied to a system of equations studied extensively by Rajaraman. The ’t-Hooft-Polyakov monopole equations are then studied and we obtain the well-known monopole solutions in the Prasad-Sommerfeld limit (λ=0); for the case λ≠0, we succeed in obtaining a non-trivial algebraic constraint between the fields of the theory.
Volume 27 Issue 5 November 1986 pp 615-621 Mathematical Physics
The complex sine-Gordon theory: soliton solutions through the virial approach
The one-soliton solutions found earlier through the inverse scattering method for the complex sine-Gordon theory by Lund (
Volume 29 Issue 4 October 1987 pp 351-357 Quantum Mechanics
On the solutions of the Wick-Cutkosky model in the instantaneous approximation
By reexamining the analysis of Basu and Biswas, based on the stereographic projection method of Fock and Levy, it is shown that the general solution of the Wick-Cutkosky model in the instantaneous approximation, hitherto unreported, involves only one quantum number; this is contrasted with the well-known solution which involves two quantum numbers, but for which the spectrum is degenerate with respect to one of them. The latter situation is shown to hold under a rather special circumstance.
Volume 32 Issue 1 January 1989 pp 89-94 Rapid Communications
Temperature-modified Coulomb potential for the electron-proton system
The finite-temperature Schrödinger equation, derived recently from the Bethe-Salpeter equation for the bound states of an electron and a proton interacting via the instantaneous Coulomb interaction, is studied in the coordinate space. An expression for the temperature-modified Coulomb potential is obtained and briefly discussed.
Volume 38 Issue 3 March 1992 pp 319-327
Relativistic remnants in the reduction of the Bethe-Salpeter equation to the Schrödinger equation
G P Malik Santokh Singh Vijaya S Varma
Following Salpeter, the Bethe-Salpeter equation for the bound system of two oppositely charged particles is reduced to a Schrödinger equation for each of the following cases: (a) both particles are spin 1/2 particles, (b) one particle is a spinor while the other is spinless, and (c) both particles are spinless. It is shown that if
Volume 43 Issue 6 December 1994 pp 443-451
Mass spectrum of elementary particles in a temperature-dependent model
G P Malik Santokh Singh Vijaya S Varma
We show that the temperature-generalization of a popular model of quark-confinement seems to provide a rather interesting insight into the origin of mass of elementary particles: as the universe cooled, there was an era when particles did not have an identity since their masses were variable; the temperature at which the conversion of these ‘nomadic’ particles into ‘elementary’ particles took place seems to have been governed by the value of a dimension-less coupling constant
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