Journal Club

Seminar Room

Tuesday 28th of October, 2025

Hour: 11:00

Title: Schwinger effect in de Sitter space

Presented by: Roberto Vega-Morales

Ref: https://arxiv.org/abs/2508.14973

Abstract:

In this blackboard talk I will give a short and basic review of the Schwinger effect in de Sitter space which has potential applications in magnetogenesis and dark matter production. In particular I will go through calculations of the de Sitter Schwinger current performed in recent years which exhibited some puzzling (un-physical) behavior. I will then discuss how our recent work seeks to remedy these puzzling features and future directions of investigation. This will be based on the following papers:

https://arxiv.org/abs/1408.4141
https://arxiv.org/abs/1603.04165
https://arxiv.org/abs/2508.14973

Hour: 11:30

Title: Imaginary scaling

Presented by: Adrián Moreno Sánchez

Ref: https://arxiv.org/abs/2506.21145

Abstract:

Recently, a hitherto unknown class of RG-stable relations between parameters of bosonic field theories have been identified and dubbed as the r0 or 'GOOFy' symmetries. Here, 1-loop properties of the r0 invariant 2-Higgs Doublet Model and a minimal symmetric model are discussed. It is concluded that the symmetry is present at the 1-loop provided the UV cut-off squared transforms non-trivially under r0. The minimal model requires the presence of two real fields.