I am a senior undergrad in computer systems field (specifically, computer networks) and applied for CS PhD this year.
My question is:
If I find a new interest in a different field before starting a PhD, is it possible to change from the field that I applied for to the different field as I start my PhD?
I can see many problems that would prevent me from changing my field. For example, I would have almost no depth in the field yet compared to other students who came for that field, but I would have to somehow find a way to find an advisor in the field who can advise me.
And I just wonder if you think any problem you see would make it almost impossible to change, so I would just have to get research experience again in the field and then reapply for CS PhD for the field
To give more about my context, I am now a 4th year undergrad and enjoying research projects I have participated in, but I really don't think those (computer networks) are what I can do or enjoy for at least next 5 years. I've been always thinking of exploring as many fields as possible and changing my field (which can be a huge change like from system to theory) after going to PhD. I think I already knew such a huge change would be almost impossible, but maybe I just pushed myself to continue my research because I felt like it was quite irresponsible to quit in the middle of the projects that professors worked with me on (I just... don't know...).
I feel very lost now as I realized I applied for PhD without knowing anything about it. If needed, I am even willing to explore new fields for several months, find a research assistant position in a new field, and prepare for grad school application again.
Thanks for reading this long post.