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Axion cosmology, lattice QCD and the dilute instanton gas

Borsanyi, Sz. ; Dierigl, M. ; Fodor, Z. ; Katz, S.D. ; Mages, S.W. ; Nogradi, D. ; Redondo, J. ; Ringwald, A. ; Szabo, K.K.



Abstract

Axions are one of the most attractive dark matter candidates. The evolution of their number density in the early universe can be determined by calculating the topological susceptibility chi(T) of QCD as a function of the temperature. Lattice QCD provides an ab initio technique to carry out such a calculation. A full result needs two ingredients: physical quark masses and a controlled continuum ...

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