Phase Diagram of the Two-Flavor Schwinger Model at Zero Temperature
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913275270135808 |
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| author | Dempsey, Ross Klebanov, Igor R. Pufu, Silviu S. Søgaard, Benjamin T. Zan, Bernardo |
| author_facet | Dempsey, Ross Klebanov, Igor R. Pufu, Silviu S. Søgaard, Benjamin T. Zan, Bernardo |
| contents | We examine the phase structure of the two-flavor Schwinger model as a function of the $θ$-angle and the two masses, $m_1$ and $m_2$. In particular, we find interesting effects at $θ=π$: along the $SU(2)$-invariant line $m_1 = m_2 = m$, in the regime where $m$ is much smaller than the charge $g$, the theory undergoes logarithmic RG flow of the Berezinskii-Kosterlitz-Thouless type. As a result, in this regime there is a non-perturbatively small mass gap $\sim e^{- A g^2/m^2}$. The $SU(2)$-invariant line lies within a region of the phase diagram where the charge conjugation symmetry is spontaneously broken and whose boundaries we determine numerically. Our numerical results are obtained using the Hamiltonian lattice gauge formulation that includes the mass shift $m_\text{lat} = m- g^2 a/4$ dictated by the discrete chiral symmetry. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_04437 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Phase Diagram of the Two-Flavor Schwinger Model at Zero Temperature Dempsey, Ross Klebanov, Igor R. Pufu, Silviu S. Søgaard, Benjamin T. Zan, Bernardo High Energy Physics - Theory High Energy Physics - Lattice Quantum Physics We examine the phase structure of the two-flavor Schwinger model as a function of the $θ$-angle and the two masses, $m_1$ and $m_2$. In particular, we find interesting effects at $θ=π$: along the $SU(2)$-invariant line $m_1 = m_2 = m$, in the regime where $m$ is much smaller than the charge $g$, the theory undergoes logarithmic RG flow of the Berezinskii-Kosterlitz-Thouless type. As a result, in this regime there is a non-perturbatively small mass gap $\sim e^{- A g^2/m^2}$. The $SU(2)$-invariant line lies within a region of the phase diagram where the charge conjugation symmetry is spontaneously broken and whose boundaries we determine numerically. Our numerical results are obtained using the Hamiltonian lattice gauge formulation that includes the mass shift $m_\text{lat} = m- g^2 a/4$ dictated by the discrete chiral symmetry. |
| title | Phase Diagram of the Two-Flavor Schwinger Model at Zero Temperature |
| topic | High Energy Physics - Theory High Energy Physics - Lattice Quantum Physics |
| url | https://arxiv.org/abs/2305.04437 |