<p>I am interested in majoring in string theory. Would this be a major under astrophysics or physics</p>
<p>You want to major in a theory?</p>
<p>Well studying it. Mainly theoretical physics. Would that just go under physics?</p>
<p>I believe you would major in physics, get a graduate degree in physics with a specialization and probably do your thesis on string theory. (sometimes undergraduate programs have to do thesis as well)</p>
<p>You don't major in string theory. That's like saying you want to major in long division instead of math. String theory is a subject you'd study and maybe even take a class on if you decide to major in physics or some other related field.</p>