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* Title: Dynamics of the Peccei-Quinn field in early universe 

* Speaker: Masahiro Takimoto (The University of Tokyo) (at CTPU Seminar room)

* Date: 3:00~4:00 PM, 25 Feb 2016


* Abstract: We consider the cosmology of the Peccei-Quinn(PQ) models paying particular attention to the dynamics of the scalar field which have PQ charge. If PQ charge is restored at some epoch, the scalar field starts to oscillate later. Such oscillating scalar field may dominantly decay into relativistic axion particles which become a dark radiation component of the universe, whose energy density is tightly bounded. We clarify in what circumstances the axion overproduction is avoided taking the thermal dissipation effects into account. We show that owing to the thermal dissipation effects, the axion overproduction is avoided even when the scalar field once dominates the universe.


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)

  1. No Image notice by Sanghyeon 2017/07/07 by Sanghyeon
    in Journal Club

    Journal Club Schedule

  2. Link to the publications

  3. No Image notice by Sanghyeon 2017/04/27 by Sanghyeon
    in PTC Seminar

    Use the indico link for the seminar announcements.

  4. No Image 16Mar
    by Andrew
    2016/03/16 by Andrew
    in PTC Seminar

    [Seminar] (Mar 22 2016) by Hwidong Yoo on 'Search for leptophobic Z’ decaying into four leptons in the final state at 8 TeV with the CMS detector'

  5. [Journal Club] (Mar 10 2016) by Doh Young Mo on 'Introduction of Jet-Image: New Method for Jet Tagging' file

  6. No Image 25Feb
    by Min-Seok
    2016/02/25 by Min-Seok
    in PTC Seminar

    [Seminar] (Feb 25 2016) by Masahiro Takimoto on 'Cosmology of Peccei-Quinn Field in Early Universe' file

  7. No Image 24Feb
    by Min-Seok
    2016/02/24 by Min-Seok
    in PTC Seminar

    [Seminar] (Feb 24 2016) by Pyungwon Ko on <Dark sector shining through 750GeV dark higgs @ LHC> file

  8. No Image 18Feb
    by ctpuweb
    2016/02/18 by ctpuweb
    in PTC Seminar

    [Seminar] (Feb 18 2016) by Koichi Hamaguchi on <Diphoton Excess and Running Couplings> file

  9. No Image 05Feb
    by ctpuweb
    2016/02/05 by ctpuweb
    in PTC Seminar

    [Seminar] (Feb 05 2016) by Priyotosh Bandyopadhyay on <Higgs bosons: discovered and hidden, in extended supersymmetric standard models at the LHC> file

  10. No Image 04Feb
    by ctpuweb
    2016/02/04 by ctpuweb
    in Journal Club

    [Journal Club] (Feb 04 2016) by Kunio Kaneta on `Isocurvature constraints on portal couplings'

  11. No Image 28Jan
    by Sanghui
    2016/01/28 by Sanghui
    in Journal Club

    [Journal Club] (Jan 28 2016) by Sang Hui Im file

  12. No Image 21Jan
    by Ryoutaro
    2016/01/21 by Ryoutaro
    in Journal Club

    [Journal Club] (Jan 21 2016) by Ryoutaro Watanabe file

  13. [School] 2016 Winter School on Collider Physics file

  14. [Workshop] Overview on the Recent Diphoton Excess at the LHC Run-II (Jan 08 2016)

  15. [Workshop] Non-conventional Searches at the LHC (IBS-CTPU Focused Workshop) (Aug 17-20 2015)

  16. No Image 13Jan
    by Min-Seok
    2016/01/13 by Min-Seok
    in PTC Seminar

    [Seminar] (Jan 13 2016) by Hiroyuki Tashiro on Search for parity-odd signatures in the gamma ray sky file

  17. No Image 12Jan
    by Min-Seok
    2016/01/12 by Min-Seok
    in PTC Seminar

    [Seminar] (Jan 12 2016) by Takashi Okamoto on Small-scale problems of cold dark matter model and baryonic solutions to them file

  18. No Image 11Jan
    by Min-Seok
    2016/01/11 by Min-Seok
    in PTC Seminar

    [Seminar] (Jan 11 2016) by Chang Sub Shin on A complete, calculable, predictive and testable model for all known and required CP violation file

  19. No Image 10Dec
    by Hyungjin
    2015/12/10 by Hyungjin
    in Journal Club

    [Journal Club] (Dec 10 2012) by Hyungjin Kim file

  20. No Image 08Dec
    by Min-Seok
    2015/12/08 by Min-Seok
    in PTC Seminar

    [Seminar] (Dec 08 2015) by Paolo Gondolo on Dark Mattert Searches: A Theorest's Perspective file

  21. [Journal Club] (Nov 26 2015) by Toyokazu Sekiguchi file

  22. No Image 20Nov
    by Min-Seok
    2015/11/20 by Min-Seok
    in PTC Seminar

    [Seminar] (Nov 20 2015) by Jae Sik Lee on Enhanced Charged Higgs Production through W±-Higgs Fusion file

  23. No Image 04Nov
    by Min-Seok
    2015/11/04 by Min-Seok
    in PTC Seminar

    [Seminar] (Oct 28 2015) by Naonori Sugiyama on <Theoretical Modeling of Cosmological Momentum Field through the Kinetic SZ Effect> file

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