2009

Gauge invariance of a critical number of flavours in QED3

Bashir, A., Raya, A., Sanchez-Madrigal, S. et al.

Understand

The fermion propagator in an arbitrary covariant gauge can be obtained from the Landau gauge result via a Landau-Khalatnikov-Fradkin transformation.

This transformation can be written in a practically useful form in both configuration and momentum space.
It is therefore possible to anticipate effects of a gauge transformation on the propagator's analytic properties.
These facts enable one to establish that if a critical number of flavours for chiral symmetry restoration and deconfinement exists in noncompact QED3, then its value is independent of the gauge parameter.

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2009
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