I'm currently writing the introduction of my Ph.D. thesis, which is about theoretical computer science. I stumbled upon the phrase
To put it in a nutshell, X is a hot topic
where X refers to some topic, which is not important here.
I would like to use this phrase in myintroduction, but I'm not sure whether it is too colloquial. Does anyone has experience in this matter? Is there a more formal way of expressing something similar?