18th Patras Workshop on Axions, WIMPs and WISPs

Session

Tuesday Session 2

4 Jul 2023, 10:55

G-003

73. Axion-like particle effects in high-energy astrophysics

Giorgio Galanti (INAF, Osservatorio Astronomico di Brera)

04/07/2023, 10:55

Abstract: Axion-like particles (ALPs) are very light neutral spin-zero bosons predicted by superstring theory and primarily interacting with two photons. In the presence of an external magnetic field they give rise to two effects: (i) photon-ALP oscillations, (ii) change of the photon polarization state. The former effect produces a modification of the photon transparency and irregularities in...

40. Axion relics in non-standard cosmologies

Paola Arias

04/07/2023, 11:25

I will review our recent findings in axion production by considering a period before the onset of Big Bang nucleosynthesis that experimented a non-standard expansion. I will start with cold dark matter production through the misalignment mechanism, firstly assuming the energy density of the universe is dominated by a particle field described by a general equation of state. Secondly, I will...

42. MADMAX

Erika Garutti (DESY)

04/07/2023, 11:45

MADMAX, the MAgnetized Disc and Mirror Axion eXperiment, is a dielectric haloscope concept with the aim to detect the axion in the mass range 40-400 ueV through axion-photon conversion in the presence of a strong magnetic field.
In this talk I will review the MADMAX design concept, and discuss the status of ongoing research into booster systems for enhancing the weak axion signal....

47. New results for searches of exotic decays with NA62 in beam-dump mode

Dr Babette Dobrich

04/07/2023, 12:05

We report on the search for visible decays of exotic mediators from data taken in "beam-dump" mode with the NA62 experiment.
The NA62 experiment can be run as a "beam-dump experiment" by removing the Kaon production target and moving the upstream collimators into a "closed" position. More than $10^{17}$ protons on target have been collected in this way during a week-long data-taking campaign...