Order-separated tensor-network method for QCD in the strong-coupling expansion
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908913423613952 |
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| author | Samberger, Thomas Bloch, Jacques Lohmayer, Robert Wettig, Tilo |
| author_facet | Samberger, Thomas Bloch, Jacques Lohmayer, Robert Wettig, Tilo |
| contents | We introduce the order-separated Grassmann higher-order tensor renormalization group (OS-GHOTRG) method for QCD with staggered quarks in the strong-coupling expansion. The method allows us to determine the expansion coefficients of the partition function, from which we can obtain the strong-coupling expansions of thermodynamical observables. We use the method in two dimensions to compute the free energy, the particle-number density, and the chiral condensate as a function of the chemical potential up to third order in the inverse coupling $β$. Although near the phase transition the expansion is only a good approximation to the full theory at small $β$, we show that the range of applicability can be greatly extended by fits to judiciously chosen transition functions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_24487 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Order-separated tensor-network method for QCD in the strong-coupling expansion Samberger, Thomas Bloch, Jacques Lohmayer, Robert Wettig, Tilo High Energy Physics - Lattice Statistical Mechanics We introduce the order-separated Grassmann higher-order tensor renormalization group (OS-GHOTRG) method for QCD with staggered quarks in the strong-coupling expansion. The method allows us to determine the expansion coefficients of the partition function, from which we can obtain the strong-coupling expansions of thermodynamical observables. We use the method in two dimensions to compute the free energy, the particle-number density, and the chiral condensate as a function of the chemical potential up to third order in the inverse coupling $β$. Although near the phase transition the expansion is only a good approximation to the full theory at small $β$, we show that the range of applicability can be greatly extended by fits to judiciously chosen transition functions. |
| title | Order-separated tensor-network method for QCD in the strong-coupling expansion |
| topic | High Energy Physics - Lattice Statistical Mechanics |
| url | https://arxiv.org/abs/2603.24487 |