65 citations · 189 across the 9 of their papers we have counts for
9 papers
New Role of Null Lagrangians in Derivation of Equations of Motion for Dynamical Systems
Rupam Das, Z. E. Musielak
The space of Null Lagrangians is the least investigated territory in dynamics since they are identically sent to zero by their Euler-Lagrange operator and thereby having no effects…
General Null Lagrangians and Their Novel Role in Classical Dynamics
Rupam Das, Zdzislaw E. Musielak
A method for constructing general null Lagrangians and their higher harmonics is presented for dynamical systems with one degree of freedom. It is shown that these Lagrangians can…
Beltrami state in black-hole accretion disk: A magnetofluid approach
Chinmoy Bhattacharjee, Rupam Das, David J. Stark +1
Using the magnetofluid unification framework, we show that the accretion disk plasma (embedded in the background geometry of a blackhole) can relax to a class of states known as th…
Novel mechanism for vorticity generation in black-hole accretion disks
Chinmoy Bhattacharjee, Rupam Das, Swadesh M. Mahajan
Vorticity generation in accretion disks around Schwarzschild and Kerr black holes is investigated in the context of magnetofluid dynamics derived for both General Relativity (GR),…
Magnetofluid Dynamics in curved spacetime
Chinmoy Bhattacharjee, Rupam Das, S. M. Mahajan
A grand unified field is constructed from Maxwell's Field tensor and appropriately modified flow field, both non-minimally coupled to gravity, to analyze the dyn…
Fermions in Loop Quantum Cosmology and the Role of Parity
Martin Bojowald, Rupam Das
Fermions play a special role in homogeneous models of quantum cosmology because the exclusion principle prevents them from forming sizable matter contributions. They can thus descr…