Conveners
Axions 1
- Steven Harris (Washington University in St. Louis)
We propose a paradigm where the unexplored cosmological evolution, a rotation in the field space, of the QCD axion or an axion-like particle gives rise to the dark matter abundance, the observed baryon asymmetry of the Universe, and/or gravitational waves. The rotation is initiated by explicit Peccei-Quinn symmetry breaking effective in the early Universe. The abundance of axion dark matter is...
Magnetars, with their extreme magnetic fields, are ideal laboratories to constrain axion-like particles. Historically, axions are beyond-the-Standard-Model particles introduced to explain the strong CP problem of QCD. Axion-like particles are generalizations of axions that are ubiquitous in top-down approaches to high-energy physics like string theory. If they exist, they are however...
Axions represent one of the most promising dark matter candidates to date. Although experimental searches have recently made huge progress, much of the axion parameter space remains unexplored. In this talk, I will show that radio observations of neutron stars (NSs) can be used to search for axion dark matter. I will then explore how dense substructures, called axion miniclusters, can lead to...
Axions might be copiously emitted during a supernova explosion, leading to an additional energy-loss channel that would shorten the duration of the neutrino burst. In this context, I will revise the axion bounds from
SN 1987A neutrino observation.
I will present recent results on axions from supernovae including(a) a state-of-the-art calculation of the axion emission via nucleon-nucleon...
We investigate the potential of core-collapse supernovae (SNe) to constrain axion-like particles (ALPs) coupled to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN producing a large ALP flux. For ALP masses exceeding 1 MeV, these ALPs would decay into...
It was recently pointed out that very energetic subclasses of supernovae (SNe), like hypernovae and superluminous SNe, might host ultra-strong magnetic fields in their core.
Such fields may catalyze the production of feebly interacting particles substantially, changing the predicted emission rates.
Here we consider the case of axion-like particles (ALPs) and show that the predicted large...
