2019年†
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
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
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.
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).
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.
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