Probing the vacuum as a chiral medium

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Autori principali:	Heinzl, T., King, B., Mercuri-Baron, A.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	High Energy Physics - Phenomenology
Accesso online:	Acceder al recurso
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_version_	1866917035592646656
author	Heinzl, T. King, B. Mercuri-Baron, A.
author_facet	Heinzl, T. King, B. Mercuri-Baron, A.
contents	We study the circular birefringence experienced by linearly polarised photons colliding with a circularly polarised background creating a vacuum of definite chirality (handedness). For this scenario the standard Heisenberg-Euler approach fails and must be supplemented by derivative corrections which we match to known Hilbert series. Choosing a plane wave background, we find equivalence between three approaches: (i) adding derivative corrections to the Heisenberg-Euler Lagrangian; (ii) improving the locally constant field approximation to the one-loop polarisation tensor; (iii) performing a low-energy expansion of the direct $2\to 2$ QED photon-photon scattering amplitude. Going beyond plane-wave backgrounds, we analyse an example of a circularly polarised standing wave sensitive to derivative corrections. We find a parameter regime where these corrections could be probed in experiments.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_19921
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Probing the vacuum as a chiral medium Heinzl, T. King, B. Mercuri-Baron, A. High Energy Physics - Phenomenology We study the circular birefringence experienced by linearly polarised photons colliding with a circularly polarised background creating a vacuum of definite chirality (handedness). For this scenario the standard Heisenberg-Euler approach fails and must be supplemented by derivative corrections which we match to known Hilbert series. Choosing a plane wave background, we find equivalence between three approaches: (i) adding derivative corrections to the Heisenberg-Euler Lagrangian; (ii) improving the locally constant field approximation to the one-loop polarisation tensor; (iii) performing a low-energy expansion of the direct $2\to 2$ QED photon-photon scattering amplitude. Going beyond plane-wave backgrounds, we analyse an example of a circularly polarised standing wave sensitive to derivative corrections. We find a parameter regime where these corrections could be probed in experiments.
title	Probing the vacuum as a chiral medium
topic	High Energy Physics - Phenomenology
url	https://arxiv.org/abs/2510.19921

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