The evolution of interdisciplinarity in physics research.

We observe a clear trend towards increasing interactions between the different sub-fields.

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However, we also note that there is an important trend of the PACS codes belonging to Interdisciplinary Physics to steadily migrate towards the core, so that at present these already occupy a significant fraction of the core.

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However, the relative increase of the density between the h = 0 nodes is much higher, indicating an increasing trend where new connections emerge between the main branches of physics.

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