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Axion Miniclusters

Schwetz-Mangold, Thomas

Abstract:
If the PQ phase transition happens after inflation, the axion energy density will have density fluctuations of order one. The size of the fluctuations is set by the horizon size at the QCD phase transition. Those fluctuations lead to the formation of gravitationally bound objects called miniclusters. A significant fraction of axion dark matter bound in miniclusters would have severe implication for axion dark matter search experiments. We present a semi-analytic method to calculate the power sepctrum of the axion miniclusters and provide an estimate for the mass function at the time of matter-radiation equality.


Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Publikationstyp Vortrag
Jahr 2017
Sprache Englisch
Identifikator KITopen ID: 1000075529
HGF-Programm 51.03.06; LK 01
Erschienen in DESY THEORY WORKSHOP, Fundamental physics in the cosmos: The early, the large and the dark Universe Hamburg, 26 - 29 September 2017
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