*2019年 [#le173fee]

***[[Seminar]] [#b85254f3]

 日時: July 3 (Wed.) 15:00-16:00
 場所: Workshop room at CCS
 講演者: Masaki Honda (Waseda Univ.)
 タイトル: 行列模型に基づく背景磁場付き非可換トーラス上の湯川結合
 概要:
 TBA

-[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2019/seminar20190703_Honda.pdf 2019/7/3:slides(pdf)]

 日時: June 28 (Fri.) 14:00-15:00
 場所: Workshop room at CCS
 講演者: Oliver Baer (Humboldt-Universitaet zu Berlin)
 タイトル: TBA
 概要:
 TBA

-[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2019/seminar20190627_Noumi.pdf 2019/6/27:slides(pdf)]

 日時: June 27 (Thu.) 15:00-16:00
 場所: Meeting room A at CCS
 講演者: Toshifumi Noumi (Kobe Univ.)
 タイトル: Conformal correlators in momentum space and cosmological applications
 概要:
 Recent studies in cosmology have shown that analytic properties of inflationary correlators,
 together with approximate conformal symmetry realized at the end of inflation, are crucial for
 probing new physics at the inflation scale. These cosmological applications have then
 boosted research activities on conformal correlators in momentum space. In this talk, after
 introducing motivations from the cosmology side, I will discuss analytic properties and
 symmetry constraints on conformal correlators in momentum space. In particular, I will
 discuss how to construct a crossing symmetric basis of four-point functions based on
 consistent factorization in analogy with scattering amplitudes.

-[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2019/seminar20190627_Noumi.pdf 2019/6/27:slides(pdf)]

 日時: May 15 (Wed.) 15:00-16:00
 場所: D413
 講演者: Kotaro Tamaoka (YITP)
 タイトル: A Generalization of the Entanglement Entropy and Holography
 概要:
 We define a new information theoretic quantity called odd entanglement entropy (OEE)
 which enables us to compute the entanglement wedge cross section in holographic CFTs.
 The entanglement wedge cross section has been introduced as a minimal cross
 section of the entanglement wedge,
 a natural generalization of the Ryu-Takayanagi surface.
 First, we review basic ingredients in order to define the OEE.
 Then, we will explain some basic properties of the OEE.
 Finally, we explicitly compute the generalized entropy for mixed states
 in two-dimensional holographic CFT and see agreement with the entanglement wedge cross section.
 This talk is based on 1809.09109 (Phys. Rev. Lett. 122, 141601). 

-[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2019/seminar20190515_Tamaoka.pdf 2019/5/15:slides(pdf)]

 日時: April 11 (Thr.) 15:00-16:00
 場所: Workshop room at CCS
 講演者: Sato Yuki (Nagoya Univ.)
 タイトル: How to "cool down" Ising model on 2d dynamical triangulations
 概要:
 The Ising model on 2d dynamical triangulations was originally introduced 
 by Kazakov in 1986, which is a statistical system including 
 gravitational degrees of freedom. This system is known to be critical at 
 the finite temperature and the continuum theory defined around the 
 critical point is the 2d gravity minimally coupled to fermions.
 We introduce an external parameter to the system, aiming at 
 observing the quantum critical behavior. Tuning the parameter to a 
 certain value the critical temperature reaches absolute zero and the 
 resulting continuum theory at the zero temperature is NOT the 2d gravity 
 minimally coupled to fermions. As it turns out, physics at the 
 zero-temperature may differ depending on the "cool down speed".
 The talk will be based on the work with Tomo Tanaka (Phys.Rev. D98 
 (2018) no.2, 026026) and the work in progress with Jan Ambjorn.

-[http://www-het.ph.tsukuba.ac.jp/Seminar/tsukuba-only/2019/seminar20190411_Sato.pdf 2019/4/11:slides(pdf)]
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