Speaker
Dr
Yusuke Taniguchi
(University of Tsukuba)
Description
Topological susceptibility brings important information of the QCD vacuum and
contributes to a production of the axion. The temperature dependence of the topological susceptibility plays a crucial role in its production rate in the early universe.
It is a test whether the axion can be an appropriate candidate of the dark matter.
In this talk we report our recent study on the topological susceptibility in the finite temperature QCD with Nf=2+1 flavors.
The topological susceptibility is given by applying the gradient flow to the finite temperature system. We cover a wide range of temperature region $174\le T\le697$ MeV.
The ud quark mass is rather heavy $m_\pi/m_\rho=0.63$ and s quark mass is
set to almost the physical value.
Primary author
Dr
Yusuke Taniguchi
(University of Tsukuba)
Co-authors
Prof.
Hiroshi Suzuki
(Kyushu University)
Prof.
Kazuyuki Kanaya
(CiRfSE, Univ. Tsukuba)
Dr
Masakiyo Kitazawa
(Osaka University)
Mr
Naoki Wakabayashi
(Niigata University)
Mr
Ryo Iwami
(Niigata University)
Dr
Shinji Ejiri
(Niigata University)
Dr
Takashi UMEDA
(Hiroshima Univ.)
