On the oscillating electric dipole moment induced by axion-fermion couplings

• DOI: 10.1007/jhep04(2024)076
• Publication Date: 2024-04-13T04:01:27Z
• Authors: Luca Di Luzio; Hector Gisbert; Philip Sørensen
• Keywords: CP violation; Oscillation (cell signaling)

A bstract It has been recently claimed that the axion coupling to fermions is responsible for an oscillating electric dipole moment (EDM) in background of dark matter. In this work, we re-examine derivation effect. Contrary previous studies, point out physical relevance boundary term, which crucial restoring shift symmetry and drastically affects EDM phenomenology. To describe latter, introduce notion a time-averaged effective EDM, encodes term whose magnitude depends on oscillation regime. For slow oscillations, washes standard resulting exact cancellation static limit. Conversely, during fast amplifies relatively contribution. This observable especially interesting case electron EDM. $$ \mathcal{O} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math> (1) axion-electron coupling, overall size regime intermediate or oscillations comparable present