18th Patras Workshop on Axions, WIMPs and WISPs

Session

Monday Session 3

3 Jul 2023, 14:00

G-003

26. Novel designs and schemes for high-mass axion haloscopes

Dr Junu Jeong (Center for Axion and Precision Physics Research, IBS)

03/07/2023, 14:00

The axion is a hypothetical particle resulting from the PQ mechanism that resolves the strong CP problem, and is one of the strong candidates for dark matter. The cavity haloscope is a highly sensitive method for detecting dark matter axions. The Center for Axion and Precision Physics Research of the Institute for Basic Science (IBS-CAPP) has recently developed various detector designs...

65. From Black Holes into the Voids: What TeV Astrophysics Tells Us about Axion-like Particles

Oindrila Ghosh (Stockholm University & the Oskar Klein Centre)

03/07/2023, 14:20

TeV blazars, ubiquitous in the extragalactic gamma-ray sky, produce pair beams that inverse-Compton cascades into GeV gamma rays. However, the non-observation of such cascades indicates that non-thermal energy loss processes such as interactions with heavy axion-like particles (ALPs) can play a role in alleviating this GeV-TeV tension, in addition to space plasma instabilities that drain...

70. Astrophysical Searches for the String Axiverse

James Maxwell (Durham University)

03/07/2023, 14:40

Compactification in string theory generally gives rise to a large number of pseudoscalar, Axion Like Particles (ALPs). Remaining agnostic to the exact form of the resulting Lagrangian, we consider an $N \in [2, 30]$ axion model for which ALPs are mass mixed in the interaction basis. As a consequence, and akin to neutrinos, we find the ALPs flavours to oscillate amongst themselves during...

35. BRASS-p Search for Exotic WISPy Phenomenon

Le Hoang Nguyen (University of Hamburg)

03/07/2023, 15:00

The Broadband Radiometric Axion Search (BRASS-p) prototype is a state-of-the-art radio telescope with exceptional sensitivity for searching WISPy dark matter within the 12-18 GHz mass range. Its analog receiver provides dual polarization sensitivity at low system temperature, and the digital backend of BRASS-p delivers high resolution ($\frac{\delta \nu}{\nu} = 10^{-8}$) over the broadband...

36. Detecting axions from SNe using underground neutrino detectors.

Alessandro Lella (Istituto Nazionale di Fisica Nucleare)

03/07/2023, 15:20

In this talk I will characterize the unexplored sensitivity of current and future neutrino experiments to an axion burst from a galactic SN. In particular I will focus on water Cherenkov detectors like Super- and Hyper-Kamiokande showing that axion interactions with oxygen nuclei in the detector can give an observable gamma-ray signal. This possibility would open a new way to detect axions in...

69. Cosmic Last Scattering Surface as an Axion Dark Matter Detector

Pranjal Trivedi (University of Hamburg)

03/07/2023, 15:40

We derive the isotropic birefringence (all-sky rotation of linear polarization) of the cosmic microwave background (CMB) sourced by axion-like particles (ALPs) or ‘axion’ dark matter. We find distinct birefringence signals for oscillating ultra-light axions at recombination as well as from local dark matter. Using Planck upper limits while incorporating allowed axion fractions of dark...