We investigate the cosmological scenario where the Peccei-Quinn symmetry breaks after inflation. In this scenario, axionic cosmic strings and domain walls form and axions are abundantly produced from these topological defects. These axions contribute to cold dark matter in the present Universe. Employing the state of art field theoretic simulations of the topological defects, we update the estimation of the axion abundance. It is found that axions can be responsible for the cold dark matter in the mass range $m_a=(0.8−1.3)×10^−4$eV for the models with the domain wall number $N_DW=1$, and $m_a=(10^-4−10^−2)$eV with a mild tuning of parameters for the models with $N_{DW}$>1. We also discuss the possibility for near-future experiments to probe these mass ranges of axions.
Journal Club
2015.11.27 20:56
[Journal Club] (Nov 26 2015) by Toyokazu Sekiguchi
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PTC Seminar / Journal Club / Workshop
PTC Seminar Organizers (click to contact) :
Chang Sub Shin Jeff Kost Dongjin Chway
PTC Seminar Schedule (click)
PTC Journal Club Organizer (click to contact) :
- Di Xu
PTC Journal Club Schedule (click)
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Journal Club Schedule
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Link to the publications
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Use the indico link for the seminar announcements.
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[Seminar] (Apr 01 2015) by Hye-Sung Lee on <Quest for a New Fundamental Force>
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[School]2016 Winter School on Cosmology and Particle Physics(Dec 12-23, 2016)
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[School] Wonju Spring School (Apr 13-18 2015)
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[School] 2018 Summer School on Cosmology and Particle Physics (Jul 23-27, 2018)
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[School] 2017 Summer School on Cosmology and Particle Physics (Aug 7-11, 2017)
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[School] 2016 Winter School on Collider Physics
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[Lecture] (Mar 09 - 13 2015) by Kiwoon Choi on <Axions>
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[Lecture] (Feb 02-06 2015) by Jai-chan Hwang
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[Journal Club] The Unnaturally Split Composite Higgs
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[Journal Club] (Oct 01 2015) by Kunio Kaneta on `Spontaneous leptogenesis via Majoron oscillation'
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[Journal Club] (Nov 27 2014) by Hyungjin Kim
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[Journal Club] (Nov 26 2015) by Toyokazu Sekiguchi
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[Journal Club] (Nov 20 2014) by Sang Hui Im
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[Journal Club] (Nov 13 2014) by Stephen Angus
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[Journal Club] (May 29 2015) by Sung Hak Lim
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[Journal Club] (May 22 2015) by Hyungjin Kim
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[Journal Club] (Mar 31 2015) by Ryotaro Watanabe
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[Journal Club] (Mar 12 2015) by Sanghui Im & Beranger Dumont
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[Journal Club] (Mar 10 2016) by Doh Young Mo on 'Introduction of Jet-Image: New Method for Jet Tagging'
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[Journal Club] (Mar 05 2015) by Hyungjin Kim