The photon as new physics messenger

Josef Pradler, OAW Vienna

Weekly Theory Seminar, and also part of the SDI seminar series.


In this talk we will discuss cosmological and laboratory probes of dark states directly coupled to the photon. In a first scenario, the phenomenology of sub-GeV dark particles, directly coupled to electromagnetism through higher dimensional operators, is considered. The prospects of detecting such states at the intensity frontier are confronted with low-energy precision tests as well as with cosmological and astrophysical observables. In a second scenario, the perfect possibility that our Universe is filled with some form of dark radiation is explored. If the latter is composed of ultra-light dark photons, they may convert into ordinary photons and induce a variety of signatures. Among them is a modification of the cosmological 21cm signal. An explanation of tentative EDGES result is offered.

(The slides will be available here)

Published May 27, 2019 10:30 AM - Last modified May 27, 2019 10:30 AM