I'm seeing this thing happen soon after I add my yeast and was wondering what it was called and the science behind it.
How soon is "soon"?
It looks like you've sprinkled dry yeast across the top of your (chilled) brew kettle and maybe waited 10-20 minutes? If so, this is the yeast "blooming" in response to being reactivated from their dried state. At what temperature is the wort? Can you provide any more detail about your process?