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000408352 1001_ $$0P:(DE-HGF)0$$aMarsh, M. C. D.$$b0$$eCorresponding author
000408352 1112_ $$0C13-06-24.5$$2inspire$$a9th Patras Workshop on Axions, WIMPs and WISPs$$cMainz$$d2013-06-24 - 2013-06-28$$gAXION-WIMP 2013$$wGermany
000408352 245__ $$aHints of a Cosmic Axion Background
000408352 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron$$c2013
000408352 29510 $$aMarsh, 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
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000408352 520__ $$aIn 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.
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