# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## Temperature dependence of topological susceptibility using gradient flow

29 Jul 2016, 17:10
20m
Building 32 Room 1015 (Highfield Campus, University of Southampton)

### Building 32 Room 1015

#### Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density

### 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.)

### Presentation Materials

 Slides
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