There are no restrictions concerning the subject matter of the papers, their level, methods applied etc. All these are left to the participants' choice. The papers, however, have to have a research character and deal with physics topics or topics directly related to physics.
There are no limitations on the content, level, methodology, or other aspects of the papers. Participants can choose their preferred subject matter, approach, and methods. However, all papers must be based on research and deal with physics topics or those directly connected to physics.