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Impact of extreme magnetic fields on the QCD topological susceptibility in the vicinity of the crossover region
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We present the first determination of the topological susceptibility from lattice QCD in the presence of strong background magnetic fields. Our simulations employ 2+1 flavours of stout improved staggered quarks with physical masses and cover a broad range of temperatures and magnetic field values. The results are extrapolated to the continuum limit using four different lattice spacings and an eigenvalue reweighting technique to reduce discretisation errors. For low temperatures, our calculations show an enhancement of the topological susceptibility due to the magnetic field, compatible with predictions from chiral perturbation theory. At high temperatures, we observe the impact of inverse magnetic catalysis on the susceptibility.
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Cited by 2 Pith papers
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Chiral and $U(1)_A$ symmetries in background magnetic fields from lattice QCD
Neutral-sector chiral and U(1)A susceptibility splittings exhibit magnetic catalysis at low T and inverse-catalysis-like suppression at large eB near the QCD crossover on HISQ lattices.
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Topological susceptibility and axion properties in the presence of a strong magnetic field within the three-flavor NJL model
In a three-flavor NJL model, the topological susceptibility and axion self-coupling grow with magnetic field at low temperature and drop sharply at the chiral transition, with finite-density effects captured via a B-d...
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