The cost of building a wall for a fermion

Wan Mokhtar, Wan Mohamad Husni; Louko, Jorma

Abstract

We analyse the energy cost of building or demolishing a wall for a massless Dirac field in (1+1)-dimensional Minkowski spacetime and the response of an Unruh-DeWitt particle detector to the generated radiation. For any smoothly-evolving wall, both the field’s energy density and the detector’s response are finite. In the limit of rapid wall creation or demolition, the energy density displays a delta function squared divergence. By contrast, the response of an Unruh-DeWitt detector, evaluated within first-order perturbation theory, diverges only logarithmically in the duration of the wall evolution. The results add to the evidence that a localised matter system may not be as sensitive to the rapid wall creation as the local expectation values of field observables. This disparity has potential interest for quantum information preservation scenarios.

Citation

Wan Mokhtar, W. M. H., & Louko, J. (2022). The cost of building a wall for a fermion. Journal of High Energy Physics, 2022(8), Article 69. https://doi.org/10.1007/JHEP08%282022%29069

• Journal Article Type: Article
• Acceptance Date: Jul 1, 2022
• Online Publication Date: Aug 4, 2022
• Publication Date: Aug 1, 2022
• Deposit Date: Aug 5, 2022
• Publicly Available Date: Aug 8, 2022
• Journal: Journal of High Energy Physics
• Electronic ISSN: 1029-8479
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 2022
• Issue: 8
• Article Number: 69
• DOI: https://doi.org/10.1007/JHEP08%282022%29069
• Keywords: Nuclear and High Energy Physics
• Public URL: https://nottingham-repository.worktribe.com/output/9589022
• Publisher URL: https://link.springer.com/article/10.1007/JHEP08(2022)069