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arxiv: 1012.5502 · v2 · pith:WRYFG2JPnew · submitted 2010-12-26 · ✦ hep-ph · astro-ph.CO· gr-qc· hep-th

Improved estimation of radiated axions from cosmological axionic strings

Takashi Hiramatsu , Masahiro Kawasaki , Toyokazu Sekiguchi , Masahide Yamaguchi , Jun'ichi Yokoyama This is my paper
classification ✦ hep-ph astro-ph.COgr-qchep-th
keywords axioniccosmologicalspectrumstringsagreementanalyzedaxionaxions
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Cosmological evolution of axionic string network is analyzed in terms of field-theoretic simulations in a box of 512^3 grids, which are the largest ever, using a new and more efficient identification scheme of global strings. The scaling parameter is found to be \xi=0.87 +- 0.14 in agreement with previous results. The energy spectrum is calculated precisely using a pseudo power spectrum estimator which significantly reduces the error in the mean reciprocal comoving momentum. The resultant constraint on the axion decay constant leads to f_a <= 3*10^11 GeV. We also discuss implications for the early Universe.

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