Physics Colloquium of 6 August 2024

"Looking into dense states of QCD matter in a neutron star"
Kenji Fukushima, University of Tokyo

There are many speculative scenarios about QCD matter in the regions of low temperature and high baryon density. Since it is hard to impose first-principles constraints there, any hints from experimental observations should be useful for us to understand what we know and what we still miss. In this talk, I will explain what we can learn from the neutron star observations. Recently, several groups (including us) reported that the equation of state along the high-density direction unexpectedly behaves in a different way from the high-temperature matter. The prospect of gravitational signals from binary neutron star mergers is mentioned in this regard with emphasis on our finding that there should be a mass window in the binary system that is particularly sensitive to QCD phase transition scenarios.

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