Dear Colleagues,

Physical systems containing a mesoscopic number of particles form a general and natural bridge between single-particle problems and many-body physics. Therefore, a better understanding of properties of such systems and their scalability has fundamental importance in different areas of physics. Natural universality of the few-body systems is, however, not well exploited, and physicists working on seemingly different problems do not always take advantage of successive progress in the whole field. One of the natural connections between different mesoscopic systems arises from the fact that all few-body systems are very elusive for standard analytical and computational techniques, i.e., these systems are too complicated for straightforward analytical or quasi-analytical treatments, and at the same time, they are too small if many-body methods are considered. Therefore, developments of theoretical and experimental techniques dedicated to these systems should be broadly promoted.

The purpose of this Special Issue is to open another platform for scientific discussions and exchange different ideas related to few-body systems. We welcome contributions from all areas of physics where classical or quantum systems of several particles are considered. The Issue is open not only to theoretical as well as experimental works dedicated to ideas, methods, and techniques building our understanding of few-body systems but also for papers where different interesting properties of such systems are studied and discussed. In this issue, we would also like to promote the idea that well-controlled few-atom systems may serve as quantum simulators for different few-body problems and help to explore spectacular consequences of a collective behavior originating in interparticle interactions and quantum statistics. Therefore, we invite everyone having scientific interests in atomic and molecular physics, condensed and soft matter physics, nuclear and particle physics, stellar and astrophysics, or computational and mathematical physics to contribute with papers focusing on few-body problems.

Prof. Dr. Tomasz Sowiński
Dr. Miguel A. Garcia-March
Guest Editors

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• Classical and quantum few-body systems
• Correlations induced by interactions and statistics
• ‘Few’ to ‘Many’ crossover
• Mesoscopic physics