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The origin and evolution of cluster magnetism
A. Shukurov, K. Subramanian, N. E. L. Haugen
Random motions can occur in the intergalactic gas of galaxy clusters at all stages of their evolution. Depending on the poorly known value of the Reynolds number, these motions can…
Magnetic helicity density and its flux in weakly inhomogeneous turbulence
Kandaswamy Subramanian, Axel Brandenburg
A gauge invariant and hence physically meaningful definition of magnetic helicity density for random fields is proposed, using the Gauss linking formula, as the density of correlat…
Can Cosmic Rays Heat the Intergalactic Medium?
Saumyadip Samui, Kandaswamy Subramanian, Raghunathan Srianand
Supernova explosions in the early star forming galaxies will accelerate cosmic rays (CRs). CRs are typically confined in the collapsed objects for a short period before escaping in…
Evolving turbulence and magnetic fields in galaxy clusters
Kandaswamy Subramanian, Anvar Shukurov, Nils Erland L. Haugen
We discuss, using simple analytical models and MHD simulations, the origin and parameters of turbulence and magnetic fields in galaxy clusters. Three physically distinct regimes ca…
Minimal tau approximation and simulations of the alpha effect
A. Brandenburg, K. Subramanian
The validity of a closure called the minimal tau approximation (MTA), is tested in the context of dynamo theory, wherein triple correlations are assumed to provide relaxation of th…
CMB Anisotropy Due to Tangled magnetic fields in re-ionized models
T. R. Seshadri, Kandaswamy Subramanian
Primordial tangled cosmological Magnetic Fields source rotational velocity perturbations of the baryon fluid, even in the post-recombination universe. These vortical modes inturn l…