The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies
Abstract The QCD phase diagram in the space of temperature and imaginary baryon chemical potential has been an interesting subject in numerical lattice QCD simulations because of the absence of the sign problem and its deep structure related to confinement/deconfinement. We study constraints on the...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-08-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP08(2023)132 |
| _version_ | 1797647439578005504 |
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| author | Shun K. Kobayashi Takahiro Yokokura Kazuya Yonekura |
| author_facet | Shun K. Kobayashi Takahiro Yokokura Kazuya Yonekura |
| author_sort | Shun K. Kobayashi |
| collection | DOAJ |
| description | Abstract The QCD phase diagram in the space of temperature and imaginary baryon chemical potential has been an interesting subject in numerical lattice QCD simulations because of the absence of the sign problem and its deep structure related to confinement/deconfinement. We study constraints on the phase diagram by using an ’t Hooft anomaly. The relevant anomaly is an anomaly in the space of imaginary chemical potential. We compute it in the UV, and discuss how it is matched by the pion effective field theory at low temperatures. Then we study implications of the anomaly to the phase diagram. There must be a line of phase transition studied in the past by Roberge and Weiss such that the expectation value of the Polyakov loop is not smooth when we cross the line. Moreover, if the greatest common divisor of the color and flavor numbers is greater than one, the phase transition across the Roberge-Weiss line must be either a first order phase transition, or a second order phase transition described by a nontrivial interacting three-dimensional CFT. |
| first_indexed | 2024-03-11T15:17:24Z |
| format | Article |
| id | doaj.art-f2730d58ff2f43eda9c5f843d6278d2d |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-11T15:17:24Z |
| publishDate | 2023-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-f2730d58ff2f43eda9c5f843d6278d2d2023-10-29T12:11:51ZengSpringerOpenJournal of High Energy Physics1029-84792023-08-012023812910.1007/JHEP08(2023)132The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomaliesShun K. Kobayashi0Takahiro Yokokura1Kazuya Yonekura2Department of Physics, Tohoku UniversityDepartment of Physics, Tohoku UniversityDepartment of Physics, Tohoku UniversityAbstract The QCD phase diagram in the space of temperature and imaginary baryon chemical potential has been an interesting subject in numerical lattice QCD simulations because of the absence of the sign problem and its deep structure related to confinement/deconfinement. We study constraints on the phase diagram by using an ’t Hooft anomaly. The relevant anomaly is an anomaly in the space of imaginary chemical potential. We compute it in the UV, and discuss how it is matched by the pion effective field theory at low temperatures. Then we study implications of the anomaly to the phase diagram. There must be a line of phase transition studied in the past by Roberge and Weiss such that the expectation value of the Polyakov loop is not smooth when we cross the line. Moreover, if the greatest common divisor of the color and flavor numbers is greater than one, the phase transition across the Roberge-Weiss line must be either a first order phase transition, or a second order phase transition described by a nontrivial interacting three-dimensional CFT.https://doi.org/10.1007/JHEP08(2023)132Anomalies in Field and String TheoriesChern-Simons TheoriesThermal Field TheoryTopological States of Matter |
| spellingShingle | Shun K. Kobayashi Takahiro Yokokura Kazuya Yonekura The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies Journal of High Energy Physics Anomalies in Field and String Theories Chern-Simons Theories Thermal Field Theory Topological States of Matter |
| title | The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies |
| title_full | The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies |
| title_fullStr | The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies |
| title_full_unstemmed | The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies |
| title_short | The QCD phase diagram in the space of imaginary chemical potential via ’t Hooft anomalies |
| title_sort | qcd phase diagram in the space of imaginary chemical potential via t hooft anomalies |
| topic | Anomalies in Field and String Theories Chern-Simons Theories Thermal Field Theory Topological States of Matter |
| url | https://doi.org/10.1007/JHEP08(2023)132 |
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