What is the fine-grained topic of the following text: The head of the Chair of Theoretical Physics after Academician G. Sahakyan of the Faculty of Physics of YSU Aram Saharyan, the applicant to the post-graduation of the Chair Tigran Petrosyan, deputy director of the Scientific-Research Institute of Physics Anna Kotanjyan were present at the event. Only return the topic.
Meeting or event related to Physics at Yerevan State University