The dark-matter axion mass

By Vincent B. Klaer, Guy D. Moore. 2017

237 citations recorded by the source corpus.

We evaluate the efficiency of axion production from spatially random initial conditions in the axion field, so a network of axionic strings is present. For the first time, we perform numerical simulations which fully account for the large short-distance contributions to the axionic string tension, and the resulting dense network of high-tension axionic strings. We find nevertheless that the total axion production is somewhat less efficient than in the angle-averaged misalignment case. Combining our results with a recent determination of the hot QCD topological susceptibility [1], we find that if the axion makes up all of the dark matter, then the axion mass is ma = 26.2 ± 3.4 μeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/86f09055ada27048de24c3a91c8b9c5b41816abf

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In Nuclear and High Energy Physics

Citations in the corpus

Early seeds of axion miniclusters (2018, methodology): “teractions in enhancing the overdensities [20,23] and the occurrence of axitons. Recent simulations of the cosmic strings network have been used to compute the total axion DM density, either directly [54,55] or by studying the energy loss from the axion string network, see [56,57] and the particular”
Physics potential of the International Axion Observatory (IAXO) (2019, methodology): “Regarding the fact that there remains the large uncertainty on the estimation of the axion abundance produced from strings, here we treat K ≈ 13 corresponding to the result of [143] as a lower limit and K .”
The landscape of QCD axion models (2020, background): “[270], which leads to an over-counting of the axion energy density [199].”
More axions from strings (2020, background): “sily lead to the dominant contribution to the abundance being missed and the total contribution being underestimated by more than one order of magnitude. As in the previous case, the authors of ref. [92] perform simulations of the entire evolution from the scaling regime to the linear regime includi”
New experimental approaches in the search for axion-like particles (2018, background): “The collaboration is however mostly motivated by the predictive post-inflation scenario where mA ∼ 100μeV seemed the best prediction for the axion mass [16] until the recent claims of 26 μeV [217] so the thickness of the first set can be optimised to one of these values.”
Beyond the Standard Models with cosmic strings (2019, background): “(4), is logarithmically violated due to the dependence of the string tension on the Hubble horizon [92–97].”
Axions from strings: the attractive solution (2018, background): “ a large extrapolation connected to the string tension and the eective axion-string coupling, the one associated to the decoupling of the radial modes of the string core remains. The results in ref. [51,57] conrm the non-trivial dependence of ˘on the logs, although the actual functional dependence i”
TASI Lectures on the Strong CP Problem and Axions (2018, background): “This is partly because of my own ignorance on the subject and partly because this field has not yet reached a clear consensus on the results [95, 96].”