Axion-Like-Particles from X-ray excess in galaxy clusters?
seminar room 3a, building 1b (DESY Hamburg)
seminar room 3a, building 1b
The aim of this journal club is to give the audience a general idea of
the developments of the paper
S. Angus, J. Conlon, M. C. D. Marsh, A. Powell, and L. Witkowski
in which it is argued that a cosmic axion background would produce a
soft X-ray excess as seen in galaxy clusters, and in particular in Coma.
In this work, they link astrophysical observations with dark radiation
and string cosmology, with an emphasis on the phenomenology. Keeping
this approach, we will discuss the current astrophysical situation of
the soft X-ray excess in galaxy clusters, and the observational
consequences of such a cosmic axion background.