Neutron stars and phase diagram in a hard-wall AdS/QCD model
| Autor: | Lorenzo Bartolini, Josef Leutgeb, Anton Rebhan, Sven Bjarke Gudnason |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
High Energy Physics - Theory
High Energy Astrophysical Phenomena (astro-ph.HE) Nuclear Theory (nucl-th) High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Nuclear Theory High Energy Physics - Theory (hep-th) High Energy Physics::Lattice High Energy Physics::Phenomenology FOS: Physical sciences Astrophysics - High Energy Astrophysical Phenomena Nuclear Experiment |
| Zdroj: | Physical Review |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.105.126014 |
| Popis: | We study the phase diagram of (large-$N_c$) QCD using a simplistic holographic hard-wall model with a dynamical scalar field and a homogeneous Ansatz representing a smeared instanton/baryon density. The resulting phase diagram is qualitatively consistent with expectations, including a mesonic, baryonic, quarkyonic, and quark-gluon plasma phase. As in other holographic models, we also find a baryonic popcorn transition, which appears at large chemical potential as a crossover. We then evaluate the nuclear matter equation of state, which turns out to be rather stiff with a large peaked sound velocity above the conformal limit, construct corresponding neutron stars using the TOV equations, and finally use a full numerical gravity/hydrodynamics computation to extract the gravitational wave signal of neutron star mergers. Comment: LaTeX: 45 pages, 12 figures; V2: references and further details added; V3: comments added and typos corrected |
| Databáze: | OpenAIRE |
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