3.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Fermi National Accelerator LaboratoryUS2.4k papers
- Purdue University West LafayetteUS2.2k papers
- Northwestern UniversityUS2.2k papers
- University of FloridaUS2.2k papers
- Massachusetts Institute of TechnologyUS2.1k papers
- University of KansasUS2.1k papers
- The Ohio State UniversityUS2.1k papers
- Carnegie Mellon UniversityUS2k papers
- University of Wisconsin–MadisonUS2k papers
- Centre National de la Recherche ScientifiqueFR2k papers
- University of Maryland, College ParkUS1.9k papers
- Joint Institute for Nuclear ResearchRU1.9k papers
212 papers · 1 filter
Bogoliubov transformation and the thermal operator representation in the real time formalism
Ashok Das, Atri Deshamukhya, Pushpa Kalauni +1
It has been shown earlier \cite{brandt,brandt1} that, in the mixed space, there is an unexpected simple relation between any finite temperature graph and its zero temperature count…
Fermion propagator in an external potential and generalized Airy functions
A. L. M. Britto, Ashok K. Das, J. Frenkel
We study the behavior of the fermion propagator in an external time dependent potential in 0+1 dimension. We show that, when the potential has upto quadratic terms in time, the pro…
Generalized Kadanoff-Baym relation in nonequilibrium quenched models
A. L. M. Britto, Ashok K. Das, J. Frenkel
In the context of a broad class of quenched models, we derive a generalized differential form of the Kadanoff-Baym (KB) ansatz which relates the out of equilibrium correlated and s…
Operator description for thermal quantum field theories on an arbitrary path in the real time formalism
Ashok Das, Pushpa Kalauni
We develop an operator description, much like thermofield dynamics, for quantum field theories on a real time path with an arbitrary parameter . We point out new…
Highly nonlinear wave solutions in a dual to the chiral model
S. G. Rajeev, Evan Ranken
We consider a two-dimensional scalar field theory with a nilpotent current algebra, which is dual to the Principal Chiral Model. The quantum theory is renormalizable and not asympt…
Proper time method in de Sitter space
Ashok K. Das, Pushpa Kalauni
We use the proper time formalism to study a (non-self-interacting) massive Klein-Gordon theory in the two dimensional de Sitter space. We determine the exact Green's function of th…
Dynamics of Perturbations in Double Field Theory & Non-Relativistic String Theory
Sung Moon Ko, Charles Melby-Thompson, Rene Meyer +1
Double Field Theory provides a geometric framework capable of describing string theory backgrounds that cannot be understood purely in terms of Riemannian geometry -- not only glob…
Generalized fluctuation-dissipation theorem in a soluble out of equilibrium model
A. L. M. Britto, Ashok K. Das, J. Frenkel
In the context of an exactly soluble out of equilibrium (quenched) model, we study an extension of the fluctuation-dissipation relation. This involves a modified differential form…
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…
Supersymmetry, shape invariance and the hypergeometric equation
Ashok K. Das, Pushpa Kalauni
It has been shown earlier that the solubility of the Legendre and the associated Legendre equations can be understood as a consequence of an underlying supersymmetry and shape inva…
Large time behavior in an exactly soluble out of equilibrium model
Ashok K. Das, J. Frenkel
We study the behavior of out of equilibrium retarded, advanced and correlated Green's functions within the context of an exactly soluble (quenched) model. We show, to the lowest or…
Where Have All the Goldstone Bosons Gone?
G. S. Guralnik, C. R. Hagen
According to a commonly held view of spontaneously broken symmetry in gauge theories, troublesome Nambu-Goldstone bosons are effectively eliminated by turning into longitudinal mod…
On the gauge independence of the fermion pole mass
Ashok K. Das, R. R. Francisco, J. Frenkel
We study the question of complete gauge independence of the fermion pole mass by choosing a general class of gauge fixing which interpolates between the covariant, the axial and th…
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…
Kinklike structures in scalar field theories: from one-field to two-field models
D. Bazeia, L. Losano, J. R. L. Santos
In this paper we study the possibility of constructing two-field models from one-field models. The idea is to start with a given one-field model and use the deformation procedure t…
Particle-antiparticle asymmetry from magnetogenesis through the Landau mechanism
D. Carcamo, Ashok Das, J. Gamboa +1
Motivated by string theory an extension of the Landau problem to quantum field theory is considered. We show that the commutator between momenta of the fields violates Lorentz and…
The String Landscape: On Formulas for Counting Vacua
Tamar Friedmann, Richard P. Stanley
We derive formulas for counting certain classes of vacua in the string/M theory landscape. We do so in the context of the moduli space of M-theory compactifications on singular man…
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…
Causal amplitudes in the Schwinger model at finite temperature
Ashok Das, R. R. Francisco, J. Frenkel
We show, in the imaginary time formalism, that the temperature dependent parts of all the retarded (advanced) amplitudes vanish in the Schwinger model. We trace this behavior to th…
A Non-Riemannian Metric on Space-Time Emergent From Scalar Quantum Field Theory
Arnab Kar, S. G. Rajeev
We show that the two-point function σ(x,x')=\sqrt{<[ϕ(x)-ϕ(x')]^{2}>} of a scalar quantum field theory is a metric (i.e., a symmetric positive function satisfying the triangle ineq…
Motion of a Test Particle in the Transverse space of Dp-Branes
Anindita Bhattacharjee, Ashok Das, Levi Greenwood +1
We investigate the motion of a test particle in higher dimensions due to the presence of extended sources like D-branes by studying the motion in the transverse space of the bra…
Scalar Quantum Field Theory on Fractals
Arnab Kar, S. G. Rajeev
We construct a family of measures for random fields based on the iterated subdivision of simple geometric shapes (triangles, squares, tetrahedrons) into a finite number of similar…
The thermal chiral anomaly in the Schwinger model
Ashok Das, J. Frenkel
In the Schwinger model at finite temperature, we derive a closed form result for the chiral anomaly which arises from the long distance behavior of the electric field \cite{frenkel…