ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Jan 30 (Thursday) 14:00


György Wolf (Wigner Research Centre for Physics; Hungary): What neutron stars 
tell about the properties of strong interaction

The existence of neutron stars are provide us with a challenge and a 
possibility to study strong interaction, too. At the center of neutron stars 
the densities can reach 6-8 times the normal nuclear densities, and these 
densities can not be studied in terrestrial experiments. Therefore, it 
provides us with constraints for the properties of the cold, dense strongly 
interacting matter.

The existence of quark matter inside the heaviest neutron stars has been the 
topic of numerous recent studies, many of them suggesting that a phase 
transition to strongly interacting conformal matter inside neutron stars is 
feasible. Here we examine this hybrid star scenario using a soft and a stiff 
hadronic model, a constituent quark model with three quark flavours, and 
applying a smooth crossover transition between the two. Within a Bayesian 
framework, we study the effect of up-to-date constraints from neutron star 
observations on the equation-of-state parameters and various neutron star 
observables. Our results show that a pure quark core is only possible if the 
maximum mass of neutron stars is below ∼ 2.35 M⊙ . However, we also find, 
consistently with other studies, that a peak in the speed of sound, exceeding 
1/3, is highly favoured by astrophysical measurements, which might indicate 
the percolation of hadrons at ∼ 3 − 4n0.


https://konkoly.hu/k-szeminariumok

The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265



Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/k-szeminariumok