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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 15: Quantum Gravity and Quantum Cosmology II

GR 15.3: Vortrag

Donnerstag, 19. März 2026, 16:45–17:00, KH 02.012

A Relational Model of Gravitationally induced Decoherence for Photons — •Roman Kemper¹, Kristina Giesel¹, and Max Joseph Fahn² — ¹Friedrich-Alexander Universität Erlangen-Nürnberg, Germany — ²Università di Bologna, Bologna Italy

This talk discusses the formulation of a decoherence model for Maxwell theory coupled to linearised gravity. The resulting dynamics are described by a master equation, which governs the evolution of the electromagnetic subsystem under the effective influence of the gravitational environment. The master equation is derived from the underlying action using the relational formalism to access the physical sector and the open quantum system framework to describe the effective influence of linearised gravity on Maxwell theory at the quantum level. Differences and similarities with existing models in the literature, including approaches based on scalar fields or alternative methods for accessing the physical sector, are discussed.

Keywords: Quantum Gravity; Decoherence Models; Relational Formalism; Open Quantum Systems