Back Numbers 2012-13
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- DAY & TIME : 3/15 (Fri.) 10:30-12:00
- SPEAKER : E. J. Chun (KIAS.)
- TITLE : BSM
in light of the Higgs and neutrinos
- ABSTRACTS : An introductory talk will be given on new physics
beyond the standard model in view of the recent Higgs discovery and the origin
of neutrino masses and mixing. The first part is a brief review
of the standard model concentrating on some of the Higgs properties and the second
part will be devoted to discussions on various seesaw models at TeV scale and their
collider signatures.
- COMMENTS : Morning Seminar
- DAY & TIME : 3/15 (Fri.) 13:30-
- SPEAKER : E. J. Chun (KIAS.)
- TITLE : LHC
Phenomenology of Type II Seesaw
- ABSTRACTS : The type II seesaw mechanism introduces a triplet
boson to explain the observed neutrino masses and mixing. As
a result, the model predicts a peculiar signature of a doubly charged boson
decaying to di-leptons which is one of the interesting
search channels at the LHC as it can tell us about the
neutrino mass pattern. In this talk, I will discuss some of the recent
developments in the field including the latest LHC results,
a novel same-sign tetra-lepton signal coming from the
triplet-antitriplet oscillation, and modifications to the
standard Higgs properties induced by the presence of the
triplet.
- COMMENTS : Afternoon Seminar
- DAY & TIME : 3/1 (Fri.) 10:30-12:00
- SPEAKER : E. Giguere (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : Journal Club
- DAY & TIME : 2/22 (Fri.) 10:30-12:00
- SPEAKER : Y. Tobita (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : "Correlation between nanosecond X-ray flashes and
stick–slip friction in peeling tape", Carlos G. Camara, Juan V.
Escobar, Jonathan R. Hird & Seth J. Putterman Nature 455,
1089-1092 (2008)
- ABSTRACTS : TBA
- COMMENTS : Journal Club
- DAY & TIME : 2/1 (Fri.) 10:30-11:00
- SPEAKER : Yuuki Takayasu (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- ABSTRACTS : TBA
- COMMENTS : Short Rehearsal
- DAY & TIME :2/1 (Fri.) 11:00-11:30
- SPEAKER : Ippei Fujisawa (Hokkaido Univ.)
- TITLE : TBA
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Short Rehearsa
- DAY & TIME : 2/2 (Fri.) 11:30-12:00
- SPEAKER : Kazuya Matsuda (Hokkaido Univ.)
- TITLE : TBA
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Short Rehears
- DAY & TIME : 2/2 (Fri.) 12:00-12:30
- SPEAKER : Naoki Yokomakura (Hokkaido Univ.)
- TITLE : TBA
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Short Rehears
- DAY & TIME : 1/25 (Fri.) 10:30-11:30
- SPEAKER : Ippei Fujisawa (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- ABSTRACTS : TBA
- COMMENTS : Long Rehearsal
- DAY & TIME : 1/25 (Fri.) 11:30-12:30
- SPEAKER : Kazuya Matsuda (Hokkaido Univ.)
- TITLE : TBA
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Long Rehearsa
- DAY & TIME : 1/25 (Fri.) 13:30-14:30
- SPEAKER : Yuuki Takayasu (Hokkaido Univ.)
- TITLE : Parity Violation at QCD processes via SUSY
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Long Rehears
- DAY & TIME : 1/25 (Fri.) 14:30-15:30
- SPEAKER : Naoki Yokomakura (Hokkaido Univ.)
- TITLE : Microscopic states of black holes
- ABSTRACTS : TBA
- E-PRINT :TBA
- COMMENTS : Long Rehears
- DAY & TIME : 1/18 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Shigeki Sugimoto (Kavli IPMU)
- TITLE : Confinement and Dynamical Symmetry Breaking in
non-SUSY Gauge Theory from S-duality in String Theory
- E-PRINT : arXiv:1207.2203 [hep-ph]
- ABSTRACTS : We discuss an attempt to understand confinement
and dynamical symmetry breaking in a 4-dimensional
non-supersymmetric gauge theory using S-duality in type IIB
string theory.
- COMMENTS : Seminar
- DAY & TIME : 1/11 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : C.S. Lim （Kobe Univ.）
- TITLE : TBA
- E-PRINT : TBA
- ABSTRACTS : Ignoring gravity, elementary particles have two
kinds of interactions, gauge and Higgs interactions. These
interactions seem to have nothing to do with. We, however,
discuss these interactions may be unified in the framework of
higher dimensional gauge theories. This scenario of
``gauge-Higgs unification" provides a possible solution to the
hierarchy problem and therefore new avenue to the physics beyond
the standard model. The gauge-Higgs unification is argued to be
closely related with other attractive scenarios of new physics.
In the scenario, Higgs is orginally a gauge field and is
regarded as a sort of Aharonov-Bohm phase. This leads to very
specific and characteristic predictions concerning various
interactions of Higgs, including the origin of hierarchical
Yukawa couplings, and other physical observables. We discuss
these phenomenological consequences in some details.
- COMMENTS : Seminar
- DAY & TIME : 12/14 (Fri.) 10:30-12:00
- SPEAKER : R.Takahashi (Hokkaido Univ.)
- TITLE : Higgs Decays in the Low Scale Type I See-Saw Model
- E-PRINT : arXiv:1208.3654 [hep-ph]
- ABSTRACTS : TBA
- COMMENTS : Journal Club
- DAY & TIME : 12/14 (Fri.) 13:30-
- SPEAKER : Y.Yamaguchi
(Hokkaido Univ.)
- TITLE : Baryogenesis via Leptogenesis
- E-PRINT : TBA
- ABSTRACTS : TBA
- COMMENTS : M1 Journal Club
- DAY & TIME : 12/7 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Kin-ya Oda (Kyoto U.)
- TITLE : New physics in LHC era: After discovery of Higgs
candidate
- ABSTRACTS :
First I review the discovery of the Higgs candidate. Currently the diphoton signal shows an excess from the Standard Model (SM) expectation. If this tendency persists, what has been discovered cannot be the SM Higgs. I present the Minimal Dilaton Model for such a possibility. Contrarily if the excess shrinks to the SM value, the observed Higgs mass indicates that the SM can be valid up to very high scales. I show the quadratic divergence in the bare Higgs mass and its implications.
- DAY & TIME : 11/30 (Fri.) 15:30-
- SPEAKER : Shuji Nakano (Hokkaido Univ.)
- TITLE : Supersymmetry and MSSM
- E-PRINT : TBA
- COMMENTS : M1 Journal Club.
- DAY & TIME : 11/30 (Fri.) 13:30-15:00
- SPEAKER : Norimi Yokozaki (IPMU)
- TITLE : Relatively heavy Higgs boson and the muon g-2 in gauge
mediation models
- ABSTRACTS : The deviation of the muon g-2 from the SM
prediction is one of the reason to consider the light SUSY
particles as O(100-1000) GeV. With such light SUSY particles, a
flavor blind way to transmit SUSY breaking effects to the
supersymmetric standard model sector is required. Otherwise,
dangerous flavor violating effects can not be suppressed. In
this sense, the gauge mediated SUSY breaking (GMSB) scenarios
are attractive. However, the recent observation of the
relatively heavy Higgs boson seems not consistent with a minimal
setup of GMSB, unless the SUSY particles are heavy. In this
talk, I will discuss possible extended GMSB scenarios which are
consistent with the recent observation of the Higgs boson mass
and the muon g-2 experiment. The phenomenology as well as the
cosmology of the model are also discussed.
- DAY & TIME : 11/30 (Fri.) 10:30-12:00
- SPEAKER : Shigeki Matsumoto (IPMU)
- TITLE : Detecting 2.7 TeV wino LSP at gamma-ray observations
- E-PRINT : TBA
- ABSTRACTS : High scale SUSY breaking scenario attracts
attentions because of recent results of the higgs search and of
non-observations of SUSY signals at the LHC. In this scenario,
the neutral wino is predicted to be the LSP, which is nothing
but a candidate for dark matter. According to the cosmology of
the particle, the wino mass is predicted to be 2.7 TeV, and an
important question here is how we can detect the dark matter. In
this talk, I would like to emphasize that gamma-ray observations
from milky-way satellites allows us to detect it in the (near)
future.
- DAY & TIME : 11/16 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Masaki Shigemori (KMI, Nagoya Univ.)
- TITLE : Black hole microstates in string theory
- E-PRINT : arXiv:1209.6056 [hep-th], arXiv:1110.2781
[hep-th], arXiv:1107.2650 [hep-th], arXiv:1004.2521
[hep-th].
- ABSTRACTS : The black hole is one of the the most intriguing
objects in our universe. Although its classical properties are
well understood, its quantum, microscopic nature is poorly
understood. String theory has been successful in explaining
certain quantum aspects of black holes, but there still remain
many unresolved problems. In this talk, I will first review the
studies of black holes in string theory, in particular recent
developments based on a novel picture of black holes called the
"fuzzball conjecture." Then, I will discuss the surprising
possibility that black holes are made of string theory objects
called "exotic branes". This would mean that the microscopic
structure of black holes cannot be described using the standard
notion of geometry that we are familiar with.
- DAY & TIME : 11/9 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Asato Tsuchiya (Shizuoka Univ.)
- TITLE : Expanding (3+1)-dimensional universe from the IIB
matrix model
- E-PRINT : arXiv:1108.1540 [hep-th], arXiv:1110.4803
[hep-th], arXiv:1208.0711 [hep-th], arXiv:1208.4910
[hep-th].
- ABSTRACTS : We study the Lorentzian version of the IIB matrix
model as a nonperturbative formulation of superstring theory. By
Monte Carlo simulation, we show that the notion of time as well
as space emerges dynamically from this model, and that we can
uniquely extract the real-time dynamics, which turns out to be
rather surprising: after ``some critical time", the SO(9)
rotational symmetry of the nine-dimensional space is
spontaneously broken down to SO(3) and the three-dimensional
space starts to expand rapidly. We also analyze the classical
equations of motion, which are expected to be valid at late
times. After providing a general prescription to solve the
equations, we examine a class of solutions, which correspond to
manifestly commutative space. In particular, we find a solution
with an expanding behavior that naturally solves the
cosmological constant problem. Finally, we propose a concrete
procedure to identify the local fields corresponding to the
massless modes that appear at late times. As an explicit
example, we discuss the massless modes associated with the
spontaneous breaking of (9+1)-dimensional Poincare symmetry and
supersymmetry.
- DAY & TIME : 11/2 (Fri.) 13:30-
- SPEAKER : Kirara Koyama (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : M1 Journal Club.
- DAY & TIME : 11/2 (Fri.) 10:30-12:00
- SPEAKER : Hisao Suzuki (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : Journal Club.
- DAY & TIME : 10/19 (Fri.) 10:30-12:00
- SPEAKER : Kazuhiko Suehiro (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : Journal Club.
- DAY & TIME : 10/12 (Fri.) 13:30-
- SPEAKER : Kenta Nakagawa (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : M1 Journal Club.
- DAY & TIME : 10/12 (Fri.) 10:30-12:00
- SPEAKER : Eun-Kyung Park (Hokkaido Univ.)
- TITLE : TBA
- E-PRINT : TBA
- COMMENTS : Journal Club.
- DAY & TIME : 10/5 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Kazuhiro Sakai (YITP)
- TITLE : Counting BPS states in E-string theory
- E-PRINT : arXiv:1111.3967 [hep-th], arXiv:1203.2921
[hep-th], arXiv:1207.5739 [hep-th].
- ABSTRACTS : The E-string theory is one of the simplest
interacting quantum field theories with minimal (1,0)
supersymmetry in six dimensions. It is obtained as the
world-volume theory of a small E_8 instanton in heterotic string
theory. The theory shows extremely rich properties when
toroidally compactified down to lower dimensions. In this talk,
I will discuss the counting of BPS states in the E-string theory
compactified on T^2 and its relation to Seiberg-Witten theory
and the counting of holomorphic curves in half K3 and del Pezzo
surfaces. I will then introduce a Nekrasov-type explicit
expression for the BPS partition function which we have found
recently and discuss its properties.
物理コロキウム
- DAY & TIME & PLACE : 9/26(水)16:30-18:00 2号館2-409
- SPEAKER : 日笠 健一（東北大学大学院理学研究院）
- TITLE : ヘリシティ振幅と新しい物理
- 要旨 : パリティ保存を破る弱い相互作用や，標準模型を超える新しい物理の関わる現象では， 素粒子のスピンの情報が重要となる。
相対論的な過程においてスピンの自由度を記述するのに有用なヘリシティ振幅の手法と，
それに基づく新しい物理の関与する過程を議論する。
集中講義 (宇宙理学特別講義1)
- DAY & TIME & PLACE :
9/25(火)10：30-12：00,13：00-18：00 2号館2-402
9/26(水)8：45-12：00,13：00-16：15 2号館2-402
9/27(木)10：30-12：00,13：00-16：15 2号館2-402
- SPEAKER : 日笠 健一（東北大学大学院理学研究院）
- TITLE : 高エネルギーフロンティアの物理1,2
- 講義内容 :
1. 素粒子理論の枠組
2. 高エネルギー素粒子過程の理論
3. 高エネルギー実験の手法
4. 素粒子標準模型
5. QCDと高エネルギーハドロン過程
6. 弱い相互作用
7. ヒッグス機構
8. ニュートリノの質量
9. ヒッグス粒子の現象論
10. 超対称標準模型
- DAY & TIME : 8/3 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Shuhei Sasa (Tohoku Univ.)
- TITLE : D-branes in Generalized Geometry and Dirac-Born-Infeld
Action
- E-PRINT : arXiv:1206.6964 [hep-th].
- ABSTRACTS : The purpose of this talk is to formulate the
Dirac-Born-Infeld (DBI) action in a framework of generalized
geometry and clarify its symmetry. A D-brane is defined as a
Dirac structure where scalar fields and gauge field are treated
on an equal footing in a static gauge. We derive generalized Lie
derivatives corresponding to the diffeomorphism and B-field
gauge transformations and show that the DBI action is invariant
under non-linearly realized symmetries for all types of
diffeomorphisms and B-field gauge transformations. Consequently,
we can interpret not only the scalar field but also the gauge
field on the D-brane as the generalized Nambu-Goldstone boson.
- DAY & TIME : 7/20, 7/27 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : M2 Students (Ippei Fujisawa, Yuki Takayasu, Kazuya
Matsuda, Naoki Yokomakura)
- TITLE : TBA
- E-PRINT : TBA
- ABSTRACTS : TBA
- COMMENTS : M2 Journal Club
- DAY & TIME : 7/13 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Koji Hashimoto (Osaka Univ. and RIKEN)
- TITLE : Atomic Nucleus from String Theory
- E-PRINT : arxiv:1103.5688 [hep-th],
arxiv:1003.4988 [hep-th].
- ABSTRACTS : In generic holographic QCD, we find that baryons
are bound to form a nucleus, and that its radius obeys the
empirically-known mass number (A) dependence A^{1/3} for large
A.
- DAY & TIME : 7/6 (Fri.) 10:30-12:00
- SPEAKER :
Wang Weichang (Hokkaido Univ.) Yutaka Tobita
(Hokkaido Univ.)
- TITLE : TBA
- COMMENTS : Journal club by Wang was cancelled.
- DAY & TIME and PLACE : 6/22 (Fri.) 13:00-14:45, 2-211
- SPEAKER : Tomohiko Tanabe (Tokyo Univ.), Masao Kuriki
(Hiroshima Univ.) Toru Takeshita (Shinshu Univ.)
- TITLE : ILC Seminar
- DAY & TIME and PLACE : 6/22 (Fri.) 15:30-, 2-11-04
- SPEAKER : Tomohiko Tanabe (Tokyo Univ.)
- TITLE : ILC Seminar (for experts)
- DAY & TIME : 6/15 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Mitsuru Kakizaki (Toyama Univ.)
- TITLE : Implementation of Universal Extra Dimensions in
micrOMEGAs
- E-PRINT : TBA
- ABSTRACTS : We present a new implementation of all level-1 and
level-2 Kaluza-Klein particles of the five-dimensional universal
extra dimension model in micrOMEGAs. With this new
implementation, we include the effects of the finite Higgs
vacuum expectation value in the Higgs potential as well as in
the fermion and gauge sectors. Radiative corrections to the
masses of the Kaluza-Klein particles are practically described
by introducing the wave function factors that violate the
five-dimensional Lorentz invariance. The loop-induced
Kaluza-Klein number violating interactions that destabilize the
lightest level-2 particle are also added.
- DAY & TIME : 6/14 (Thu.) 14:00-
- SPEAKER : Hiroshi Suzuki (RIKEN)
- COMMENTS : Informal Seminar.
- DAY & TIME : 6/8 (Fri.) 10:30-12:00
- SPEAKER : Yoshi Kondo (Hokkaido Univ.)
- TITLE : Orbifolds, fuzzy spheres and chiral fermions
- E-PRINT : arXiv:1002.2606 [hep-th].
- COMMENTS : Journal Club.
- DAY & TIME : 6/1 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Ryo Takahashi (Hokkaido Univ.)
- TITLE : Split Seesaw Mechanism and Flavor Symmetry
- DAY & TIME : 5/25 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Andrea Prudenziati (YITP)
- TITLE : Looking for a worldsheet description of the Nekrasov
partition function
- E-PRINT : arXiv:1204.2322 [hep-th].
- ABSTRACTS : I will show how the Nekrasov partition function,
expanded in a certain two parameters way, can be described by a
world sheet theory involving Riemann surfaces with genus
counting associated to both the parameters. I will present the
most general ansatz compatible with the holomorphic anomaly
equation respected by those amplitudes and derive all the
possible conditions that have to be satisfied. Finally I will
try to give some physical insight for this model and present my
conclusions.
- DAY & TIME : 5/18 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Kunio Kaneta (Hokkaido Univ./Osaka Univ.)
- TITLE : Parity Violation in QCD processes via SUSY
- E-PRINT : arXiv:1109.5082 [hep-ph],
arXiv:1109.5442 [hep-ph].
- ABSTRACTS : In SUSY QCD, mass of left-handed squark is
generally different from that of right-handed squark. Therefore,
parity can be violated in QCD process through
quark-squark-gluino interaction, which is chiral. We discuss
following two topics by focusing on parity violation First topic
is a discrimination between SUSY and UED. SUSY and UED are
promising candidates beyond the SM. However, it is difficult to
distinguish one from the other. We make a proposal to
discriminate SUSY from UED at the LHC by focusing on the parity
violation without discovering any new particles. Next we will
discuss bounds for left-right degeneracy between squark masses.
Since any parity violations have not been discovered in QCD,
non-degeneracy bounds should be obtained between left- and
right-handed squarks. We try to estimate the bounds by an
investigation of charmonium decay and nucleon interactions.
- DAY & TIME : 5/11 (Fri.) 10:30-12:00, 13:30-
- SPEAKER : Masazumi Honda (KEK)
- TITLE : Numerical studies of the ABJM theory for arbitrary N
at arbitrary coupling constant
- E-PRINT : arXiv:1202.5300 [hep-th].
- ABSTRACTS : We show that the ABJM theory, which is an N=6
superconformal U(N)*U(N) Chern-Simons gauge theory, can be
studied for arbitrary N at arbitrary coupling constant by
applying a simple Monte Carlo method to the matrix model that
can be derived from the theory by using the localization
technique. This opens up the possibility of probing the quantum
aspects of M-theory and testing the AdS_4/CFT_3 duality at the
quantum level. Here we calculate the free energy, and confirm
the N^{3/2} scaling in the M-theory limit predicted from the
gravity side. We also find that our results nicely interpolate
the analytical formulae proposed previously in the M-theory and
type IIA regimes. Furthermore, we show that some results
obtained by the Fermi gas approach can be clearly understood
from the constant map contribution obtained by the genus
expansion. The method can be easily generalized to the
calculations of BPS operators and to other theories that reduce
to matrix models.
- DAY & TIME : 4/20 (Fri.) 13:00-14:30
- SPEAKER : Naoyuki Haba (Hokkaido Univ.)
- DAY & TIME : 4/13 (Fri.) 10:30-12:00
- SPEAKER : Kenji Hotta (Hokkaido Univ.)
- TITLE : Classicalization of Gravitons and Goldstones
- E-PRINT : arXiv:1103.5963 [hep-th].
- COMMENTS : Journal Club.
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