Dark and Visible Photons as Source of CP Violation

TL;DR

This paper investigates how CP-violating interactions between dark and visible photons could contribute to excess gamma radiation in galactic centers, highlighting a potential new source of CP violation.

Contribution

It introduces a model with CP-violating kinetic mixing between dark and visible photons and calculates their conversion probabilities, exploring their role in gamma-ray excess.

Findings

CP-violating processes contribute non-trivially to gamma radiation

Conversion probabilities differ between CP-conserving and violating processes

CP violation between dark and visible photons is theoretically plausible

Abstract

The problem of excess gamma radiation in the center of galaxy is discussed assuming that the photon's production is dominated by two kinds of processes, the first one due to the conventional kinetic mixing term and, secondly, due to a kinetic mixing term violating the CP symmetry between dark and visible photons. The CP violation symmetry between dark and visible sectors is not forbidden and, in principle, could be considered as an additional source of CP violation. The conversion probability between dark and visible photons is calculated and compared between both processes. The processes violating CP are less significant but contribute non-trivially to the excess gamma radiation.