Separation of infrared and bulk in thermal QCD
Abstract A new thermal regime of QCD, featuring decoupled scale-invariant infrared glue, has been proposed to exist both in pure-glue (N f =0) and “real-world” (N f =2+1 at physical quark masses) QCD. In this IR phase, elementary degrees of freedom flood the infrared, forming a distinct component in...
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| Format: | Article |
| Language: | English |
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2024-12-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP12(2024)101 |
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| author | The χQCD collaboration and the CLQCD collaboration Xiao-Lan Meng Peng Sun Andrei Alexandru Ivan Horváth Keh-Fei Liu Gen Wang Yi-Bo Yang |
| author_facet | The χQCD collaboration and the CLQCD collaboration Xiao-Lan Meng Peng Sun Andrei Alexandru Ivan Horváth Keh-Fei Liu Gen Wang Yi-Bo Yang |
| author_sort | The χQCD collaboration and the CLQCD collaboration |
| collection | DOAJ |
| description | Abstract A new thermal regime of QCD, featuring decoupled scale-invariant infrared glue, has been proposed to exist both in pure-glue (N f =0) and “real-world” (N f =2+1 at physical quark masses) QCD. In this IR phase, elementary degrees of freedom flood the infrared, forming a distinct component independent from the bulk. This behavior necessitates non-analyticities in the theory. In pure-glue QCD, such non-analyticities have been shown to arise via Anderson-like mobility edges in Dirac spectra (λ IR = 0, ±λ A ≠ 0), as manifested in the dimension function d IR(λ). Here, we present the first evidence, based on lattice QCD calculation at a=0.105 fm, that this mechanism is also at work in real-world QCD, thus supporting the existence of the proposed IR regime in nature. An important aspect of our results is that, while at T = 234 MeV we find a dimensional jump between zero modes and lowest near-zero modes very close to unity (d IR = 3 to d IR ≃ 2), similar to the IR phase of pure-glue QCD, at T = 187 MeV we observe a continuous λ-dependence. This suggests that thermal states just above the chiral crossover are non-analytically (in T) connected to thermal state at T = 234 MeV, supporting the key original proposition that the transition into the IR regime occurs at a temperature strictly above the chiral crossover. |
| format | Article |
| id | doaj-art-b5a31378c73b405d9d2cad7dac25b206 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-b5a31378c73b405d9d2cad7dac25b2062025-01-05T12:06:39ZengSpringerOpenJournal of High Energy Physics1029-84792024-12-0120241212110.1007/JHEP12(2024)101Separation of infrared and bulk in thermal QCDThe χQCD collaboration and the CLQCD collaborationXiao-Lan Meng0Peng Sun1Andrei Alexandru2Ivan Horváth3Keh-Fei Liu4Gen Wang5Yi-Bo Yang6CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesInstitute of Modern Physics, Chinese Academy of SciencesThe George Washington UniversityNuclear Physics Institute CASUniversity of KentuckyAix-Marseille Université, Université de Toulon, CNRS, CPTCAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesAbstract A new thermal regime of QCD, featuring decoupled scale-invariant infrared glue, has been proposed to exist both in pure-glue (N f =0) and “real-world” (N f =2+1 at physical quark masses) QCD. In this IR phase, elementary degrees of freedom flood the infrared, forming a distinct component independent from the bulk. This behavior necessitates non-analyticities in the theory. In pure-glue QCD, such non-analyticities have been shown to arise via Anderson-like mobility edges in Dirac spectra (λ IR = 0, ±λ A ≠ 0), as manifested in the dimension function d IR(λ). Here, we present the first evidence, based on lattice QCD calculation at a=0.105 fm, that this mechanism is also at work in real-world QCD, thus supporting the existence of the proposed IR regime in nature. An important aspect of our results is that, while at T = 234 MeV we find a dimensional jump between zero modes and lowest near-zero modes very close to unity (d IR = 3 to d IR ≃ 2), similar to the IR phase of pure-glue QCD, at T = 187 MeV we observe a continuous λ-dependence. This suggests that thermal states just above the chiral crossover are non-analytically (in T) connected to thermal state at T = 234 MeV, supporting the key original proposition that the transition into the IR regime occurs at a temperature strictly above the chiral crossover.https://doi.org/10.1007/JHEP12(2024)101Finite Temperature or Finite DensityLattice QCDNon-Zero Temperature and DensityPhase Transitions |
| spellingShingle | The χQCD collaboration and the CLQCD collaboration Xiao-Lan Meng Peng Sun Andrei Alexandru Ivan Horváth Keh-Fei Liu Gen Wang Yi-Bo Yang Separation of infrared and bulk in thermal QCD Journal of High Energy Physics Finite Temperature or Finite Density Lattice QCD Non-Zero Temperature and Density Phase Transitions |
| title | Separation of infrared and bulk in thermal QCD |
| title_full | Separation of infrared and bulk in thermal QCD |
| title_fullStr | Separation of infrared and bulk in thermal QCD |
| title_full_unstemmed | Separation of infrared and bulk in thermal QCD |
| title_short | Separation of infrared and bulk in thermal QCD |
| title_sort | separation of infrared and bulk in thermal qcd |
| topic | Finite Temperature or Finite Density Lattice QCD Non-Zero Temperature and Density Phase Transitions |
| url | https://doi.org/10.1007/JHEP12(2024)101 |
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