ELFT HÍRADÓ

[Andras LASZLO <laszlo.andras AT wigner.hu>]

---------- Forwarded message ----------
Date: Fri, 5 May 2023 22:59:17 +0200 (CEST)
From: Daniel Nogradi <nogradi AT bodri.elte.hu>
To: Daniel Nogradi <nogradi AT bodri.elte.hu>
Subject: ELTE particle physics seminar - 9 May


Date/Time: 9 May, Tuesday, 14:15

Location: ELTE TTK, second floor, 2.54 Novobatzky room

Speaker: Janos Takatsy (Wigner)

Title:  What neutron stars tell about the hadron-quark phase transition

Abstract:

The low temperature - high density part of the phase diagram is yet only
accessible through observations of neutron stars. 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. We examine this hybrid star
scenario using various hadronic models, an effective constituent quark model
with three quark flavours, and applying a smooth crossover transition between
the two. We use astrophysical observations in a Bayesian framework to 
constrain
the equation of state and parameters of our quark model and the crossover 
phase
transition. Among other discoveries, we find that a peak in the speed of 
sound,
exceeding the high density, conformal limit, is highly preferred, which might
suggest the percolation of hadrons at densities existing in heavy neutron 
stars.

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