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Holographic QCD Running Coupling for Heavy Quarks in Strong Magnetic Field
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abstract
We investigate the influence of a magnetic field on the running coupling constant for a heavy-quark model in a bottom-up holographic approach. To achieve this, we employ a magnetized Einstein-Maxwell-dilaton background that captures the essential features of heavy quark dynamics. Similar to the light-quark model, the running coupling $\alpha$ for heavy quarks decreases in the presence of a strong external magnetic field at fixed temperature and chemical potential. The key distinction between the light and heavy quark models lies in the locations of their respective phase transitions. However, near the 1st order phase transitions, the behavior of $\alpha$ is analogous for both cases: $\alpha$ exhibits jumps that depend on temperature, chemical potential, and magnetic field strength.
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Phase Diagram Magnetic Features of Holographic Anisotropic Model for $z^4$-term Heavy Quarks
The z^4 anisotropic holographic heavy-quark model exhibits direct magnetic catalysis in both its first-order phase transition and its temporal-Wilson-loop crossover, and the string tension weakens sharply with magnetic field.
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