This workshop aims to bring together a group of experts in nuclear and particle theory and experiments, gravitational wave and electromagnetic astronomy, nuclear astrophysics, nucleosynthesis and neutrinos, and numerical relativity and simulations. The goal is to explore fundamental details regarding the states of ultra-dense matter on the QCD phase diagram that govern the physics of neutron stars (NSs).
Multi-messenger observations of neutron stars are driving significant efforts to constrain high-density equations of state (EOSs) and are providing critical insights into the phase structures of ultra-dense matter. These include, but are not limited to, the precise determination of pulsar masses through radio observations, simultaneous mass and radius measurements based on the geometric and thermal modeling of hotspots on rapidly rotating pulsars, estimates of surface luminosities from both accreting and isolated neutron stars via X-ray emissions, as well as anticipated neutrino signals from future galactic core-collapse supernova events. Most significantly, gravitational-wave detections from binary neutron star mergers have been leveraged to refine the range of compactness and tidal deformability of these extremely compact objects, accompanied by the follow-up electromagnetic signals that carry unprecedented information on the composition and properties of their neutron-rich ejecta.
On the other hand, recent and planned experiments from terrestrial laboratories are playing a pivotal role in setting limits on the low- to intermediate-density EOS and interpreting the transport properties of relevant degenerate systems. Furthermore, advances in theory and simulations are providing valuable insights into physical processes in NSs. This includes efforts to identify and characterize observable signatures of exotic phases—such as hypernuclei and nuclear pasta, strange hyperons and kaon/pion condensates, deconfined quarks, quarkyonic matter, stellar superfluidity and superconductivity—and even potential signatures of dark matter particles and physics beyond the standard model (BSM).
Interpreting and connecting these different aspects of study requires a cross-disciplinary endeavor involving communities from various related subfields, a primary goal of this workshop. The main program will span from June 6 until June 10, 2026. Each day will typically feature a few selected talks, followed by ample time for informal, extensive discussion intended to exchange ideas and stimulate collaborations. We anticipate 40-50 participants from diverse backgrounds to join us; junior researchers are especially encouraged to apply and contribute.
The workshop sessions will be conducted in English, and the registration fee is 700 RMB per person which includes coffee breaks and lunch. Interested participants should complete the registration form by Friday May 22, 2026. Lodging will be arranged in a unified manner and the expenses are to be covered by the participants themselves.
Organizing Committee
Sophia Han (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
Zidu Lin (Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University)
Shuzhe Shi (Department of Physics, Tsinghua University)
