Speaker
Description
We use RHMC simulations to study chiral symmetry breaking for massless lattice QED in a strong external magnetic field. Our earlier simulations had shown that chiral symmetry is broken by a strong external magnetic field $B$ with $eB=2\pi\times100/36^2=0.4848...$ at bare coupling $\alpha=1/5$ and predicted the condensate in the massless limit. We had later performed simulations with a relatively weaker external magnetic field $eB=2\pi\times24/36^2=0.1163...$ and the same bare coupling. While we again saw evidence that chiral symmetry was broken in the massless limit, it would have required lattices much larger than we could handle to estimate the value of chiral condensate in this limit. We are now simulating using an intermediate value of the external magnetic field $eB=2\pi\times64/36^2=0.3102...$, and preliminary results indicate that the massless chiral condensate does indeed scale as $(eB)^{3/2}$ as expected.