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quark and gluon condensates

Cambridge University Press (1)

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8 - Quark Stars
Jürgen Schaffner-Bielich, Goethe-Universität Frankfurt Am Main
Book:

Compact Star Physics

Published online:

17 August 2020

Print publication:

27 August 2020, pp 209-236
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Summary

The theory of quantum chromodynamics (QCD) is introduced. Features of QCD as the nontrivial vacuum due to quark and gluon condensate and asymptotic freedom at high-energy scales are discussed. The concept of perturbative QCD and the running of the coupling constant is established. The equation of state of QCD at high temperatures from lattice QCD is reviewed and confronted with perturbative QCD calculations. The QCD equation of state at high baryon density is discussed. Properties of selfbound stars are developed where the equation of state has a nonvanishing pressure at a nonvanishing energy density. The mass–radius relation of pure quark stars is examined and compared to the limits from causality.