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news:do_dark_matter_axions_form_a_bose-einstein_condensate_in_space [2015/08/27 14:11]
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news:do_dark_matter_axions_form_a_bose-einstein_condensate_in_space [2015/08/27 14:11] (current)
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 Do Dark Matter Axions Form A Bose-Einstein Condensate in Space? Do Dark Matter Axions Form A Bose-Einstein Condensate in Space?
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 Chanda Prescod-Weinstein (MIT) Chanda Prescod-Weinstein (MIT)
  
 Recently there has been significant interest in the claim that dark matter axions gravitationally thermalize and form a Bose-Einstein condensate with cosmologically long-range correlation. This has potential consequences for structure formation. Here I critically examine this claim and point out that there is an essential difference between the thermalization and formation of a condensate due to repulsive interactions,​ which can indeed drive long-range order, and that due to attractive interactions,​ which can lead to localized Bose clumps (stars or solitons) that only exhibit short range correlation. Since the axion is primarily governed by attractive interactions -- gravitation and scalar-scalar contact interactions -- I conclude that the claim of long-range correlation is unjustified and discuss the phenomenological consequences of our result. Recently there has been significant interest in the claim that dark matter axions gravitationally thermalize and form a Bose-Einstein condensate with cosmologically long-range correlation. This has potential consequences for structure formation. Here I critically examine this claim and point out that there is an essential difference between the thermalization and formation of a condensate due to repulsive interactions,​ which can indeed drive long-range order, and that due to attractive interactions,​ which can lead to localized Bose clumps (stars or solitons) that only exhibit short range correlation. Since the axion is primarily governed by attractive interactions -- gravitation and scalar-scalar contact interactions -- I conclude that the claim of long-range correlation is unjustified and discuss the phenomenological consequences of our result.