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액시온 및 극한상호작용 연구단
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"Invisible" QCD axion rolling through the QCD phase transition

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Title
"Invisible" QCD axion rolling through the QCD phase transition
Author(s)
Jihn E. Kim; Se-Jin Kim
Publication Date
2018-08
Journal
PHYSICS LETTERS B, v.783, no., pp.357 - 363
Publisher
ELSEVIER SCIENCE BV
Abstract
Visible matter in the current Universe is a consequence of the phase transition of the strong force, quantum chromodynamics (QCD). This phase transition has occurred at the Universe temperature around T c ≃165 MeV while it was expanding. Strongly interacting matter particles are quarks above T c , while they are pions, protons and neutrons below T c . The spin degrees of freedom 37 in the quark and gluon phase just above T c are converted to 3 (pions) after the phase transition. This phase transition might have been achieved mostly at supercooled temperatures. The supercooling was provided by the expansion of the Universe. We obtain the effective bubble formation rate α(T)≈10 4−5 MeV and the completion temperature of the phase change (to the hadronic phase), T f ≃126 MeV. During the phase transition, the scale factor R has increased by a factor of 2.4. This provides a key knowledge on the energy density of "invisible" QCD axion at the full hadronic-phase commencement temperature T f , and allows for us to estimate the current energy density of cold dark matter composed of "invisible" QCD axions. © 2018 The Authors
URI
https://pr.ibs.re.kr/handle/8788114/5474
ISSN
0370-2693
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > Journal Papers (저널논문)
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