Abstract
In this paper, we construct a causal and conformally covariant massless free quantum field on the (1 + 1)-dimensional Minkowski spacetime. This field is of the Gupta–Bleuler type and does not suffer from infrared divergences. Although negative frequency states are used in its construction, the field has no unusual physical features: the energy–momentum tensor behaves reasonably when applied to physical states and it is also shown that particle detectors moving in the vacuum behave as expected.
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