%0 Conference Paper
%A Marsh, M. C. D.
%T Hints of a Cosmic Axion Background
%N DESY-PROC-2013-04
%C Hamburg
%I Verlag Deutsches Elektronen-Synchrotron
%M PUBDB-2018-02805
%M DESY-PROC-2013-04
%@ 978-3-935702-83-6 
%B DESY-PROC
%P 159-163
%D 2013
%< Marsh, M.C.D. "Hints of a Cosmic Axion Background" in Proceedings, 9th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2013) / Oberlack, Uwe, Sissol, Pierre (eds.), 2013 ; AXION-WIMP 2013 : 9th Patras Workshop on Axions, WIMPs and WISPs , 2013-06-23 - 2013-06-28, Mainz
%X In models of particle physics and cosmology arising from compactifications of string theory , the reheating of the standard model after inflation generically proceeds through the decay of heavy moduli. Non-vanishing branching ratios for moduli decay into axions generate axionic dark radiation which linger in the present universe as a homogeneous and isotropic background of relativistic axions, hence called the Cosmic Axion Background (CAB). Axion-photon conversion in magnetic fields may render the CAB visible, and we show that the soft X-ray excess observed in galaxy clusters may provide hints for the existence of a CAB.
%B 9th Patras Workshop on Axions, WIMPs and WISPs
%C 24 Jun 2013 - 28 Jun 2013, Mainz (Germany)
Y2 24 Jun 2013 - 28 Jun 2013
M2 Mainz, Germany
%K Hypothetisches Teilchen (gnd)
%F PUB:(DE-HGF)29 ; PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
%9 ReportContribution to a conference proceedingsContribution to a book
%R 10.3204/DESY-PROC-2013-04/marsh_david
%U https://bib-pubdb1.desy.de/record/408352