Figure 1
Modularity Q of APS journal-induced scholar communities (solid blue line).
For each year t, we build a collaboration network based on the papers published in the 5-year time interval between t − 2 and t + 2. Such a network snapshot consists only of active scholars, who published at least one paper in that time window. If a scholar published papers in more than one journal, we select the first journal in that period. The grey areas correspond to the introduction of major new journals. The dashed red line plots the modularity obtained from a shuffled version of the collaboration network that preserves the degree of every node.
