Dr. Sebastian Hoof from the University of Göttingen, Germany, talks about "Cosmological constraints on decaying axion-like particles: a global analysis" at the 17th Patras Workshop on Axions, WIMPs and WISPs.
The Patras Workshop took place at the Johannes Gutenberg University of Mainz as the second week of events within the Wavy Dark Matter Summer event series in August 2022. www.wavydarkmatter.org
Abstract:
Future cosmological probes promise significant progress in probing
the dark universe and the related fundamental particles. Their
impact is most powerful when we combine cosmological data with
astrophysical observations and laboratory experiments. While computational
tools are available for such studies, the large number of
model parameters and ensuring consistency between data sets can
present difficult challenges. In this talk, I will show how the globalfitting
framework GAMBIT can be used to constrain non-thermal
axion-like particles (ALPs) with keV-to-MeV masses that decay into
photons [1]. For the first time we combine various cosmological
and astrophysical constraints in a joint likelihood approach. This
ensures the consistency of assumptions and allows us to investigate
the entire multi-dimensional parameter space instead of fixing some
parameters to benchmark values. Leaving the ALP abundance and
reheating temperature as free parameters, we identify and re-open
still viable ALP parameter space – even slightly improving
BBN observables compared to standard cosmology. In this context,
I will comment on the additional constraining power from future
spectral distortion missions. Our findings demonstrate the important
complementarity of astrophysical and cosmological data and
encourage the extension of our analysis to models with ALP-matter
couplings.
[1] [ Ссылка ]
