Prof K. Subramanian
Inter-University Centre for Astronomy and Astrophysics (IUCAA) Pune

Magnetic fields are ubiquitous in the universe and coherent
fields can be found in a variety of astrophysical objects
from stars, to galaxies to the largest galaxy clusters.
We examine how such large scale magnetic fields arise.
The basic paradigm involves the amplification of a small
seed magnetic field by a self-excited dynamo. The seed itself
requires a cosmic battery effect. We discuss one such battery
called the Biermann battery. We then discuss astrophysical
dynamos, which typically involves turbulent flows that can amplify
a weak seed magnetic field exponentially fast. Current problems and
prospects of the dynamo paradigm are summarized.