What is a formal way to say something has a lot of activity in it? I can only think of two informal ways to say it. For example:
- This field of physics is very "happening" right now.
- This field of physics is very "hot" right now
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I think dynamic may fit in your context:
- Characterized by continuous change, activity, or progress: a dynamic housing market.
In full swing or in high gear: may be useful expression to convey the idea
- Fig. at the peak of activity; moving fast or efficiently. (*Typically: be ~; move [into] ~; get [into] ~.) In the summer months, things really get into full swing around here. We go skiing in the mountains each winter. Things are in high gear there in November.