TL;DR
This paper analyzes quantum field theory in M"obius corner kaleidoscopes, deriving the vacuum stress-energy tensor as a sum of cosmic string contributions, highlighting challenges in formulating spin-half theories in this setting.
Contribution
It introduces a novel approach to quantum field theory in corner geometries and derives explicit stress-energy tensor expressions for free fields.
Findings
Vacuum stress-energy tensor expressed as sum of cosmic string contributions
Method applicable to free fields in corner geometries
Challenges identified in extending to spin-half theories
Abstract
Quantum field theory is discussed in M\"obius corner kaleidoscopes using the method of images. The vacuum average of the stress-energy tensor of a free field is derived and is shown to be a simple sum of straight cosmic string expressions, the strings running along the edges of the corners. It does not seem possible to set up a spin-half theory easily.
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