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Meson Spectral Functions at Finite Temperature and Isospin Density with Functional Renormalization Group

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arxiv 1703.01035 v1 pith:XSD6G6DH submitted 2017-03-03 hep-ph nucl-th

Ziyue Wang , Pengfei Zhuang This is my paper · ORCID
classification hep-phnucl-th
keywords temperaturedensityisospinmesonfiniteflowfunctionalfunctions
verification ladder T0 review T1 audit T2 compute T3 formal
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The pion superfluid and the corresponding Goldstone and soft modes are investigated in two-flavor quark-meson model with functional renormalization group. By solving the flow equations for the effective potential and the meson two-point functions at finite temperature and isospin density, the critical temperature for the superfluid increases sizeably in comparison with solving the flow equation for the potential only. The spectral function for the soft mode shows clearly a transition from meson gas to quark gas with increasing temperature and a crossover from BEC to BCS pairing of quarks with increasing isospin density.

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Cited by 4 Pith papers

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    A first computation of the pion spectral function in the QCD moat regime reveals a quasiparticle peak at nonzero spacelike momentum, the moaton, and indicates no instability toward inhomogeneous chiral condensation fo...

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    In a spectral DSE computation, the quark propagator develops complex-conjugate poles when the classical quark-gluon vertex strength exceeds a critical value, while the full QCD strength is predicted to stay below that value.

  3. Phase structure of quark matter and in-medium properties of mesons from Callan-Symanzik flows

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A symmetry-restored Callan-Symanzik functional RG produces a physical phase diagram and meson spectral functions for the quark-meson model, where the unconstrained scheme fails.

  4. Critical scaling for spectral functions

    hep-th 2025-06 conditional novelty 5.0 of 10

    A spectral renormalisation group computation extracts the anomalous dimension eta ~ 0.1 for 2+1-dimensional phi^4 theory in the scaling regime, within a truncated approximation.

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