  We trace the evolution of Indian physics community from 1919 to 2013 by
analysing the coauthorship network constructed from papers published by authors
in India in American Physical Society journals. We make inferences on Indias
contribution to different branches of Physics and identify the most influential
Indian physicists at different time periods. The relative contribution of India
to global physics publication(research) and its variation across subfields of
Physics is assessed. We extract the changing collaboration pattern of authors
between Indian physicists through various network measures. We study the
evolution of Indian physics communities and trace the mean life and
stationarity of communities by size in different APS journals. We map the
transition of authors between communities of different sizes from 1970 to 2013,
capturing their birth, growth, merger and collapse. We find that Indian-Foreign
collaborations are increasing at a faster pace compared to the Indian-Indian.
We observe that the degree distribution of Indian collaboration networks
follows the power law, with distinct patterns between Physical Review A, B and
E, and high energy physics journals Physical Review C and D, and Physical
Review Letters. In almost every measure, we observe strong structural
differences between low-energy and high-energy physics journals.
