Abstract

Although they have not yet been detected, axions and axion-like particles (ALPs) continue to maintain the interest (even increasingly so) of the rare-event searches community as viable candidates for the Dark Matter of the Universe but also as a solution for several other puzzles of astrophysics. Their property of coupling to photons has inspired different experimental methods for their detection, one of which is the helioscope technique. The CERN Axion Solar Telescope (CAST) is the most sensitive helioscope built up to date and has recently published part of the latest data taken with the magnet bores gradually filled with 3He, probing the mass range up to 1.17 eV. The International AXion Observatory (IAXO) is being proposed as a facility where different axion studies can be performed, with the primary goal to study axions coming from the Sun. Designed to maximize sensitivity, it will improve the levels reached by CAST by almost 5 orders of magnitude in signal detection, that is more than one order of magnitude in terms of gaγ. Here we will summarize the most important aspects of the helioscopes, and focus mainly on IAXO, based on the recent papers [1, 2].

Highlights

  • The discovery that the Universe has a very intenseDark Side has supposed a revolution: 68% of the matterenergy budget is in the form of Dark Energy, 27% is in the form of Dark Matter (DM) and only 5% is ordinary matter [3]

  • This system is considered a pathfinder for the International AXion Observatory (IAXO)

  • Axion helioscopes continue to present an attractive technique to look for axions and axion-like particles

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Summary

Introduction

Dark Side has supposed a revolution: 68% of the matterenergy budget is in the form of Dark Energy, 27% is in the form of Dark Matter (DM) and only 5% is ordinary matter [3]. Axions arise as a consequence of a spontaneous breaking of a global symmetry proposed to solve the strong-CP problem [4, 5, 6] and since have been evoked in several occasions as solutions for other problems, one of which is the DM, as they can have been copiously produced in the early Universe They would have a very small mass, interact only weakly with ordinary matter, and have been restricted due to accelerator experiments as well as astrophysical observations

Axion detection
A B field γ
IAXO: the International AXion Observatory
Findings
Conclusions
Full Text
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