We will have the supersymmetry journal club starting this semester.
It is held on Friday 11:00- at Room 815, NTU new physics
building. Everyone is welcome to join and contribute.
Here is the reading list .
May 18 (Fri.) 11:00-,
Darren Shih (Berkeley)
Title:Introduction to Freudenthal gauge theory
String seminar is usually held at
New Physics Building in NTU, Taipei,
Seminars in the past are in the below of this page (past events).
May 18 (Fri.) 2:20PM-3:50PM,
Room 815 @ NTU, New Physics Building
Darren Shih (Berkeley)
Freudenthal gauge theory
ABSTRACT:We present a novel gauge field theory, based on the Freudenthal
Triple System (FTS), a ternary algebra with mixed symmetry (not completely symmetric)
structure constants. The theory, named Freudenthal Gauge Theory (FGT), is invariant
under two symmetries : the symplectic gauge Lie algebra constructed from the FTS triple
product and a novel global non-linear symmetry, the so-called Freudenthal duality.
We prove a No-Go Theorem, stating the incompatibility of the invariance under Freudenthal
duality and the coupling to space-time vector and/or spinor fields.
May 18 (Fri.) 4:00PM-5:30PM,
Room 815 @ NTU, New Physics Building
Chi-Ming Chang (Harvard)
W_N minimal model and its gravity dual
May 25 (Fri.) 2:20PM,
Room 815 @ NTU, New Physics Building
Hiroyuki Kitamoto (KEK)
Soft gravitons screen couplings in de Sitter space
ABSTRACT:The scale invariance of the quantum fluctuations in de Sitter
space leads to the appearance of de Sitter symmetry breaking infra-red logarithms
in the graviton propagator. We investigate how virtual gravitons of the
super-horizon scale affect the local dynamics of matter fields at
sub-horizon scale. We show that the IR logarithms do not spoil Lorentz invariance
in scalar, Dirac and gauge field theories. The leading IR logarithms can be
absorbed by time dependent wave function renormalization factors. In the interacting
field theory with lambda phi^4, Yukawa and gauge interactions, we find
that the couplings become time dependent with definite scaling exponents. We
argue that the relative scaling exponents of the couplings are gauge
invariant and physical as we can use the evolution of a coupling as a physical time.
June 22 (Fri.) 2:20PM,
Room 815 @ NTU, New Physics Building
Yasuhiro Sekino (KEK)
TBA
June 29 (Fri.) 2:20PM-3:50PM,
Room 815 @ NTU, New Physics Building
Jia-Rui Sun (ECUST)
TBA
June 29 (Fri.) 4:00PM-5:30PM,
Room 815 @ NTU, New Physics Building
Xian-Hui Ge (ECUST)
TBA