Dense QCD and compact stars

Theoretical Physics Colloquium by Prof. Armen Sedrakian.
This presentation was held live on February 23, 2021 as part of the theoretical physics colloquium series hosted by Prof. Igor Shovkovy at the Arizona State University. The series features high-quality interactive presentations on current advances in theoretical physics by active researchers in the field of theoretical physics.
Abstract for this presentation:
The multimessenger era of observations of compact stars started with the observation of gravitational waves from binary neutron star merger GW170817 in 2017. I will discuss recent developments in the density functional theory-based equations of states of dense matter focusing on the phase transition from hadronic to quark degrees of freedom. The discussion will include the mass-radius (M-R) relation of compact stars in the light of recent inferences of the mass and radius via NICER observations and on tidal deformability inferred from the GW170817 event. I will show that a sequential first-order phase transitions can lead to emergence of triplets of stars in the M-R diagram – stars with the same mass, but different radii. The consequences of emergence of twin and triplet stars for the tidal deformabilities and potential signatures of the first-order phase transition will be discussed.

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