Deconfined, Massive Quark Phase at High Density and Compact Stars: A Holographic Study
| Autor: | Fadafan, Kazem Bitaghsir, Rojas, Jesus Cruz, Evans, Nick |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 101, 126005 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.101.126005 |
| Popis: | In Hoyos et al. (arXiv:1603.02943) a holographic D3/D7 system was used to describe a deconfined yet massive quark phase of QCD at finite density, concluding that the equation of state of such a phase was not stiff enough to support exotic dense stars. That analysis used a hard quark mass to represent the dynamical mass and assumed a conformal gauge background. Here we phenomenologically adjust the D3/D7 system to include a running anomalous dimension for the quark condensate. This introduces a dynamical mechanism for chiral symmetry breaking yet the model still has a deconfined massive phase at intermediate densities. We show that these systems, dependent on the running profile in the deep IR, generate much stiffer equations of state and non-monotonic behaviour in the speed of sound. The results suggest that these equations of state may be closer to supporting hybrid stars with quark cores. Comment: 13 pages, 16 figures, added discussion |
| Databáze: | arXiv |
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