Equation of state and speed of sound of isospin-asymmetric QCD on the lattice
Abstract We determine the QCD equation of state at nonzero temperature in the presence of an isospin asymmetry between the light quark chemical potentials on the lattice. Our simulations employ N f = 2 + 1 flavors of dynamical staggered quarks at physical masses, using three different lattice spacin...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2023)055 |
| _version_ | 1797647467564498944 |
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| author | B. B. Brandt F. Cuteri G. Endrődi |
| author_facet | B. B. Brandt F. Cuteri G. Endrődi |
| author_sort | B. B. Brandt |
| collection | DOAJ |
| description | Abstract We determine the QCD equation of state at nonzero temperature in the presence of an isospin asymmetry between the light quark chemical potentials on the lattice. Our simulations employ N f = 2 + 1 flavors of dynamical staggered quarks at physical masses, using three different lattice spacings. The main results, obtained at the individual lattice spacings, are based on a two-dimensional spline interpolation of the isospin density, from which all relevant quantities can be obtained analytically. In particular, we present results for the pressure, the interaction measure, the energy and entropy densities, as well as the speed of sound. Remarkably, the latter is found to exceed its ideal gas limit deep in the pion condensed phase, the first account of the violation of this limit in first principles QCD. Finally, we also compute the phase diagram in the temperature — isospin density plane for the first time. Even though the results are not continuum extrapolated and thus not final, the data for all observables will be useful for the benchmarking of effective theories and low-energy models of QCD and are provided in ancillary files for simple reuse. |
| first_indexed | 2024-03-11T15:16:39Z |
| format | Article |
| id | doaj.art-46cd93d4e7b34ff38d3931d2484fc18b |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-11T15:16:39Z |
| publishDate | 2023-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-46cd93d4e7b34ff38d3931d2484fc18b2023-10-29T12:09:17ZengSpringerOpenJournal of High Energy Physics1029-84792023-07-012023713210.1007/JHEP07(2023)055Equation of state and speed of sound of isospin-asymmetric QCD on the latticeB. B. Brandt0F. Cuteri1G. Endrődi2Fakultät für Physik, Universität BielefeldInstitut für Theoretische Physik, Goethe-Universität Frankfurt am MainFakultät für Physik, Universität BielefeldAbstract We determine the QCD equation of state at nonzero temperature in the presence of an isospin asymmetry between the light quark chemical potentials on the lattice. Our simulations employ N f = 2 + 1 flavors of dynamical staggered quarks at physical masses, using three different lattice spacings. The main results, obtained at the individual lattice spacings, are based on a two-dimensional spline interpolation of the isospin density, from which all relevant quantities can be obtained analytically. In particular, we present results for the pressure, the interaction measure, the energy and entropy densities, as well as the speed of sound. Remarkably, the latter is found to exceed its ideal gas limit deep in the pion condensed phase, the first account of the violation of this limit in first principles QCD. Finally, we also compute the phase diagram in the temperature — isospin density plane for the first time. Even though the results are not continuum extrapolated and thus not final, the data for all observables will be useful for the benchmarking of effective theories and low-energy models of QCD and are provided in ancillary files for simple reuse.https://doi.org/10.1007/JHEP07(2023)055Non-Zero Temperature and DensityPhase Diagram or Equation of StateEarly Universe Particle PhysicsPhase Transitions |
| spellingShingle | B. B. Brandt F. Cuteri G. Endrődi Equation of state and speed of sound of isospin-asymmetric QCD on the lattice Journal of High Energy Physics Non-Zero Temperature and Density Phase Diagram or Equation of State Early Universe Particle Physics Phase Transitions |
| title | Equation of state and speed of sound of isospin-asymmetric QCD on the lattice |
| title_full | Equation of state and speed of sound of isospin-asymmetric QCD on the lattice |
| title_fullStr | Equation of state and speed of sound of isospin-asymmetric QCD on the lattice |
| title_full_unstemmed | Equation of state and speed of sound of isospin-asymmetric QCD on the lattice |
| title_short | Equation of state and speed of sound of isospin-asymmetric QCD on the lattice |
| title_sort | equation of state and speed of sound of isospin asymmetric qcd on the lattice |
| topic | Non-Zero Temperature and Density Phase Diagram or Equation of State Early Universe Particle Physics Phase Transitions |
| url | https://doi.org/10.1007/JHEP07(2023)055 |
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