Why are they accepting people with only bachelors degree
Who are "they?"
Different countries, and sometimes different universities in the same country, and even different deparements in the same university, have different paths to the Ph.D.
In the USA, most (not necessarily all) Ph.D. physics programs normally accept students (at least ones from the USA) only directly from a bachelor's degree. They do about two years of coursework which would in other countries be taken as part of a master's degree, and then start on their dissertation research.