25 citations · 99 across the 8 of their papers we have counts for
6 papers
Derivation of the fluctuation-dissipation theorem from unitarity
Ashok K. Das, J. Frenkel
Using the closed time path formalism in thermal field theory, we give a derivation of the fluctuation-dissipation theorem which is based on the unitarity of the -matrix.
A path integral approach to the Langevin equation
Ashok K. Das, Sudhakar Panda, J. R. L. Santos
We study the Langevin equation with both a white noise and a colored noise. We construct the Lagrangian as well as the Hamiltonian for the generalized Langevin equation which leads…
The pole of the fermion propagator in a general class of gauges
Ashok K. Das, J. Frenkel
We study the behavior of the pole of the fermion propagator, in QED in -dimensions, in a general class of gauges which interpolate between the covariant, the axial and the Coulo…
Infrared divergences, mass shell singularities and gauge dependence of the dynamical fermion mass
Ashok K. Das, J. Frenkel, C. Schubert
We study the behavior of the dynamical fermion mass when infrared divergences and mass shell singularities are present in a gauge theory. In particular, in the massive Schwinger mo…
Supersymmetry, shape invariance and the Legendre equations
D. Bazeia, Ashok Das
In three space dimensions, when a physical system possesses spherical symmetry, the dynamical equations automatically lead to the Legendre and the associated Legendre equations, wi…
The structure of supersymmetry in symmetric quantum mechanics
D. Bazeia, Ashok Das, L. Greenwood +1
The structure of supersymmetry is analyzed systematically in symmetric quantum mechanical theories. We give a detailed description of supersymmetric systems associated…