Anshuman's success is exceptional and wish to carry it forward uncorrupted to his dream of becoming a theoretical physicist. By the way, I have a very humble suggestion. Don't accept any of sponsors or sponsorships. That will be a burden for you in future. Instead, try to get some government fundig or better to try a bank loan. Identify some good bank mangagers and convince them about this. You can repay it after few years of your study-cum-job in the US.