During my undergraduate years I was interested in condensed matter theory and string theory and I was debating which topic to choose for my grad school application. I finally decided to go to string theory but during grad school application this year I got rejected from every single grad school I applied to. For the next cycle I am wondering if I should go to condensed matter theory. I plan to apply to the same schools (along with some new ones). Will the old schools frown upon the fact that I changed subfields for practical reasons? After all I do like condensed matter theory, just my other liking didn't work well.