Jha saheb, you have very good credentials to get admit in PHD. Make sure you have a good GRE score, good recomendation letters, paper publication, good essay about ur plans of research to make ur case strong. In almost all the cases a PHD candid will be provided with some kind of assistantship, so dont worry about that. Admid in a PHD course is more iportant than funding. Once you got admit make sure to talk to your major prof about future fundins as he will be responsible for ur funding.
