A hard-cutoff scheme for scalar and fermionic QED is constructed that preserves gauge invariance and reproduces the standard Euler-Heisenberg effective action up to cutoff-suppressed periodic corrections.
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The leading low-T correction to the two-loop Heisenberg-Euler Lagrangian is extracted from derivatives of the one-loop zero-T version via real-time formalism, then dressed with tadpoles and resummed to all loops.
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Hard cutoff and gauge theories
A hard-cutoff scheme for scalar and fermionic QED is constructed that preserves gauge invariance and reproduces the standard Euler-Heisenberg effective action up to cutoff-suppressed periodic corrections.
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Leading low-temperature correction to the Heisenberg-Euler Lagrangian
The leading low-T correction to the two-loop Heisenberg-Euler Lagrangian is extracted from derivatives of the one-loop zero-T version via real-time formalism, then dressed with tadpoles and resummed to all loops.