Exotic Scenarios for Compact Astrophysical Objects

Dear Colleagues,

One of the most important problems of physics and astrophysics is the internal structure of compact objects, including neutron stars, boson stars, white dwarfs and compact dark objects as well. In particular, the internal structure of all the above became subject of a thorough study by researchers from different branches of physics including nuclear physics, astrophysics, particle physics, general relativity and thermodynamics. Problems such as a) the composition and properties of dense nuclear matter; b) the existence of exotic phases involving strangeness, such as hyperons, kaon or pion condensates, and deconfined quark matter; c) the possibility of dark matter being absorbed inside them; or even d) the existence of compact dark objects, all of them today are included in the researcher’s agenda. On the other hand, the accelerated improvement of the research, concerning the study of gravitational waves, has opened important perspectives to study the above theoretical predictions. We expect that in the near future, with the help of the detection of gravitational waves from events associated with compact objects (binary neutron star merger, various instability modes, etc.) and other observations including mainly the X-ray radiation and gamma-rays burst, the theoretical predictions and speculations will be able to be tested, providing us answers to some of the most fundamental problems of physics. The scope of the present Special Issue is to expose the above important problems and to highlight how they can be addressed both from the theoretical and observational point of view.

Dr. Vlasios Petousis
Dr. Charalampos Moustakidis
Dr. Martin Veselsky
Guest Editors

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• compacts objects
• neutron stars
• hybrid stars
• strange quark stars
• boson stars
• white dwarfs
• dark objects