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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:

  1. This field of physics is very "happening" right now.
  2. This field of physics is very "hot" right now
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    Popular, trendy, in vogue . . .
    – Robusto
    Commented Feb 20, 2015 at 15:11
  • You could say it's very much a live issue - which is slightly colloquial, but much less "slangy" than your examples. Or topical
    – FumbleFingers
    Commented Feb 20, 2015 at 15:12

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Sounds as if the word you need is active. This field of physics is very active, 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.

or

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.
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  • "Dynamic" and "in full swing" are perfect fits.
    – Centaurus
    Commented Feb 20, 2015 at 15:23

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