Lattice QCD for Cosmology

Borsanyi, Sz.; Kawanai, T.; Kampert, K. H.; Katz, S. D.; Pasztor, A.; Pittler, F.; Szabo, K. K.; Ringwald, A.; Fodor, Z.; Kovacs, T. G.; Mages, S. W.; Redondo, J.

Preprint/Report

PUBDB-2016-02539

Lattice QCD for Cosmology

Borsanyi, S. ; Fodor, Z. (Corresponding author) ; Kampert, K. H. ; Katz, S. D. ; Kawanai, T. ; Kovacs, T. G. ; Mages, S. W. ; Pasztor, A. ; Pittler, F. ; Redondo, J. ; Ringwald, A.DESY* ; Szabo, K. K.

2016

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Report No.: DESY-16-105; arXiv:1606.07494

Abstract: We present a full result for the equation of state (EoS) in 2+1+1 (up/down, strange and charm quarks are present) flavour lattice QCD. We extend this analysis and give the equation of state in 2+1+1+1 flavour QCD. In order to describe the evolution of the universe from temperatures several hundreds of GeV to several tens of MeV we also include the known effects of the electroweak theory and give the effective degree of freedoms. As another application of lattice QCD we calculate the topological susceptibility (chi) up to the few GeV temperature region. These two results, EoS and chi, can be used to predict the dark matter axions mass in the post-inflation scenario and/or give the relationship between the axions mass and the universal axionic angle, which acts as a initial condition of our universe.

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