Top physicists in string theory typically hold a PhD degree in physics or a closely related field. A PhD (Doctor of Philosophy) is the highest academic degree awarded in most countries and represents a significant level of expertise and research accomplishment in a specific area of study.
String theory is a highly specialized and advanced field within theoretical physics. Pursuing a PhD in string theory requires a strong foundation in physics and mathematics, as well as a deep understanding of quantum mechanics, general relativity, and other relevant topics.
While it is difficult to provide an exact number, as it varies among individuals, many top physicists in string theory hold a single PhD degree. They have typically completed their doctoral studies, conducted original research, and made significant contributions to the field. However, it is not uncommon for some physicists to pursue additional postdoctoral research or hold multiple degrees in related disciplines to further enhance their expertise and broaden their knowledge base.
It's worth noting that expertise in string theory often involves interdisciplinary knowledge and collaboration with experts in mathematics, theoretical physics, and related fields. The pursuit of knowledge in string theory and other cutting-edge areas of physics often involves lifelong learning and continuous engagement with the scientific community.