I am about to get my bachelor degree in computer science. I have applied PhD programs of US universities to earn doctorate degree in computer architecture subject. I kept my hopes high and applied the most of top US schools, but rejected by the most of them (mostly because my GRE, TOEFL grades are not top for these schools, I think). Hopefully I was admitted some of the schools that I applied.
I know pursuing a PhD and conducting research is not easy, but it is a serious process that requires the one to devote himself or herself to. Luckily I like working on computer architecture and learn about new innovations, techniques, ideas proposed by researchers. I think computer architecture is a field fully open to innovation, research and development. However, at the same time I love spending time on web technologies. I have been developing new applications related with web services, mobile services, social media, content management systems etc.
Do you think would it be really possible to pursue a PhD and simultaneously work on a start-up project?
I am not looking for answers saying that it would be possible as long as you manage your time to work on them both or it is up to your advisor or program etc. I know after some point everything up to you, but I don't know the PhD experience and that's why I am asking this question here.
PS: I hope this question would help others in the sense that it is about the possibility of serious extra activities during PhD process, rather than being an personal issue.