Switching Fields in Grad School Is it Possible to switch to Theoretical Physics from Chemical Engineering ? If so,  how can i do it ?
You will need to speak to the different departments on this. You may lose credit for the classes you have already taken in Chem. Engineering since the two fields are different. It is not "impossible", however, these two department might have different requirements for admissions, so you may not be admitted to the Theoretical Physics program. Again, best to speak to your adviser and the departments.