We simulate magnetic reconnection in electron-positron (pair) plasma using acollisionless two-fluid model with isotropic pressure. In this model theresistive, Hall, and electrokinetic pressure terms are absent from the curl ofOhm's law, leaving the inertial term alone to provide for magneticreconnection. Our simulations suggest that for pair plasma simulated withisotropic pressure fast reconnection does not occur without the aid ofsufficient (numerical) diffusion. We contrast this result with simulations andpublished results showing fast reconnection for collisionless two-fluid plasmawith isotropic pressures and non-canceling mass-to-charge ratios, where Halleffects are present and numerical diffusion is small, and with published PICstudies of pair plasma which observe fast reconnection and attribute it tononisotropic pressure.
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