Improved estimation of radiated axions from cosmological axionic strings

Details Improved estimation of radiated axions from cosmological axionic strings Improved estimation of radiated axions from cosmological axionic strings

2010-12-26

arxiv.org/abs/1012.5502v2

Phys.Rev.D83:123531, 2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 7 figures

Scientific paper

10.1103/PhysRevD.83.123531

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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