Thank you @TakeruK. Most of them in a stage that application deadline has passed, but decisions have not made, yet. Professors themselves indicate that the best time to contact with them is during the evaluation process (after deadline, but before decision made). Is that mean they reached my documents and decided they are not interesting in me or they just trying to be patient until all decisions will be made? Please comment
Hello folks! I wrote 7 potential professors from different universities and didn't get any reply. I tried both formal and more sincere mails, all of them were polite. I am interested in specific field of Physics and I think there is no problem in expressing my research area. What do you think the possible reason is?