2020年6月1日 (月) 17:00
Title: Novel Perspectives in String Phenomenology
Speaker: Alon E. Faraggi, University of Liverpool, UK

I will review the structure of the fermionic Z2xZ2 orbifolds that produced a large space of phenomenological three generation models. I will discuss the trial and error old school method that gave rise to the first known string derived MSSM models, as well as the more modern classification methods that enables the analysis of large spaces of vacua and extraction of some of the global properties underlying them, e.g. spinor--vector duality. I will discuss a new direction of research that was initiated over the past year. Since the mid-eighties it is known that in addition to the ten dimensional tachyon free heterotic-string vacua there exist tachyonic ten dimensional vacua. In the supersymmetric and non-supersymmetric tachyon free cases the ten dimensional tachyon are projected out by the same projection. I will discuss the construction of phenomenological tachyon free models starting from the tachyonic 10D vacua and their particular features.


2020年5月25日 (月) 16:00

Title: How Domain Walls of N=1, D=4 SYM look like

Speaker: Dmitri Sorokin, University of Padua, Italy

Abstract: We review main features of the pure N=1, D=4 SYM with the gauge group SU(N) and its effective description by the Veneziano-Yankielowicz generalized sigma-model. We then indicate that the construction of BPS domain walls interpolating between different SYM vacua requires the presence of a dynamical membrane source. We will show how such a membrane is coupled to the SYM and present the explicit form of BPS domain walls which it creates in the Veneziano-Yankielowicz effective theory. In particular, we will describe 1/2 BPS domain wall configurations with |k| less than or equal to N/3, where k is the membrane charge that sets the "distance" between two distinct SUSY vacua. 



2020年5月22日 (金) 14:00

General-audience geek-out Zoom talk.
Speaker: Yasha Neiman.
Title: "Reductionism, physics, mathematics and the mind".


2020年5月18日 (月) 15:30 17:00

Title: Quantization of folded strings in non-critical dimensions

Speaker: Dorin Weissmann

Abstract: I will talk about some problems that arise when attempting to quantize rotating strings semiclassically, in the critical and non-critical dimensions. The problems are divergences associated with folding points in the string. A rotating closed string is a basic system that suffers from this problem, and I show how we deal with it by treating the fold as a boundary and placing mass terms there. Based on an upcoming paper with J. Sonnenschein.


2020年6月4日 (木) 16:00

This is the first seminar in the online seminar series OIST Neuroscience Online Seminar (ONOS). Dr. Lukas Ian Schmitt is a team leader of the distributed cognitive processing laboratory in RIKEN. Please join us using the following link
Meeting ID: 914 2313 7155
Password: 337917


2020年5月13日 (水) 17:00 18:30

CFF internal seminar


2020年5月8日 (金) 14:00

Seminar for general audience, about mankind's discovery of magic.
Speaker: Yasha Neiman.
Title: "The spiritual art of Calculus and the union of Heaven and Earth".


2020年4月23日 (木) 14:00

General geek-out Zoom Webinar.
Speaker: Yasha Neiman.
Title: Clean hands and the Scientific Revolution.


2020年3月25日 (水) 13:00 14:00

"Dr. Takashi Saito, Team Leader, Laboratory for Cell Signaling, RIKEN. Language: English, no interpretation."


2020年3月16日 (月) 9:30

Speaker: Prof. Andrew Lobb

Morse theory is a branch of mathematics with which we can infer topological information of manifolds. In this series of lectures we will explore its formulation and how it encodes topology.