Seminars
2010
Report Meeting by GCOE Postdocs
 Date and time
 March 7th, 2010 (Mon) pm: 13:20  16:20
 Place
 Room 525 [5F], Physics Department)
 Program

13:20 Kazuto Otani
Efficient laserproton acceleration from locally metal coated polyethylene foil
13:40 Shigeto Kabuki
Study of 3D Reconstruction Method for ElectronTracking Compton Camera
14:00 Ryo Toda
A role of 3He atoms for NCRI response of solid 4He
14:20 Norichika Sago
Crosscultural comparison between black hole perturbation and postNewtonian theory
14:40 Break
15:00 Naoki Isobe
Longterm Xray observation of blazars with MAXI
15:20 Hidetoshi Morita
Spatiotemporal pattern in a conservative dynamical system
15:40 Yoshimasa Hidaka
Soft modes in QED/QCD plasma at high temperature
16:00 Alberto Martinez Torres
Fewbody systems made of kaons
GCOE/YITP seminar
 title
 Experimental investigations in superconductor/ferromagnet heterostructues:
a close look to induced superconductivity inside a ferromagnet
 author

Professor Edgar Patino
（University of Los Andes, Bogota, Colombia）
 date
 Feb. 8 (TUE), 2011, 13:30  14:45
 place
 Room 525［5F］, Physics Department
 abstract

This talk starts with a short review of the main experimental
investigations on the title subject. It is also intended to serve as an
introduction to the physics of superconductivity under the presence of
domain walls. First, the speaker briefly discusses general aspects of
Superconductor/Ferromagnet (S/F) proximity effects. Then the socalled
domain wall superconductivity (DWS) and stray field effects (SFE) are
clarified. The talk concludes with a discussion of induced superconductivity
inside a ferromagnet, as well as some outstanding issues and desirable
future work.
Ref. E. J. Patino, C. Bell and M.G. Blamire,
“Sudden Critical Current Drops Induced in S/F Structures”, European Physical Journal B 68, 7377 (2009).
 contact
 Y. Maeno、ext. 3783
 note

GCOE/YITP seminar
 title
 General Many Body Theory for alpha Particle (quartet) condensation in the macroscopic Limit
 author

Peter Schuck
（Orsay, France）
 date
 November 29 (Mon), 2010, 13:30 〜17:30
 place
 Room 525［5F］, Physics Department
 abstract

Buffer gas cooling has provided the basis for new types of cold beams, trapping of exotic
atoms, study of new collisional processes in atoms and molecules, production of quantum gases
and, now, the study of molecule clustering. This talk will review some of the recent results from
our lab. This will include the creation of cold molecular beams in a cryogenic intermediate regime
where radicals and other species can be formed at temperatures around one Kelvin at a velocity
around 150 meters per second. Also presented will be new results on three body and two body
association of atoms and molecules. In particular, the binding, or lack thereof, of helium to target
species, both atoms and molecules, will be discussed. Cooling of Naphthalene to around four
Kelvin will be described.
 contact
 Yoshiro Takahashi (Ext. 3745) (yitk＠scphys.kyotou.ac.jp)
 note

GCOE Seminar
 title
 Cooling of Molecules with Inert Gases: from Oxygen to Naphthalene
 author

Prof. John M.Doyle
（Harvard University）
 date
 November 11 (Thu), 2010, 16:00 〜17:30
 place
 Room 525［5F］, Physics Department
 abstract

Buffer gas cooling has provided the basis for new types of cold beams, trapping of exotic
atoms, study of new collisional processes in atoms and molecules, production of quantum gases
and, now, the study of molecule clustering. This talk will review some of the recent results from
our lab. This will include the creation of cold molecular beams in a cryogenic intermediate regime
where radicals and other species can be formed at temperatures around one Kelvin at a velocity
around 150 meters per second. Also presented will be new results on three body and two body
association of atoms and molecules. In particular, the binding, or lack thereof, of helium to target
species, both atoms and molecules, will be discussed. Cooling of Naphthalene to around four
Kelvin will be described.
 contact
 Yoshiro Takahashi (Ext. 3745) (yitk＠scphys.kyotou.ac.jp)
 note

GCOE/YITP seminar (Particle Physics)
 title
 Lattice string field theory
 author

Michael Kroyter
（TelAviv University）
 date
 October 25(Mon), 2010, 13:30 
 place
 Coference Room Y306, Yukawa Hall, Yukawa Institute, Kyoto University
 abstract

String field theory is a candidate for a full
nonperturbative definition of string theory. We want
to check whether it might be possible to fully define
it at the quantum level. To that end, we try to formulate
it on a spacetime lattice. We examine potential problems
with this approach and then turn to the particular case
of one dimensional open bosonic string field theory.
We report the first results of our simulations.
 contact
 Naoki Sasakura ( ext. 7037)
 note

http://www.yukawa.kyotou.ac.jp/contents/seminar/detail.php?SNUM=51071
GCOE seminar
 title
 Solid state physics with fermionic atomic quantum gases: engineering metals and Mott insulators in an optical lattice
 author

Dr. Robert Jordens
（ETH Zurich, Prof. Esslinger Group）
 date
 Sep.28(Tue), 2010, 10:30 〜
 place
 Room 115［1F］, Physics Department
 abstract

 contact
 Yoshiro Takahashi (yitk＠scphys.kyotou.ac.jp, ext. 3745)
 note

GCOE seminar
 title
 Towards Magnetic Trapping of CaH
 author

Julia H. Rasmussen
（Harvard University, USA）
 date
 September 17(FRI), 2010, 14:00  15:00
 place
 Room 115［1F］, Physics Department
 abstract

 contact
 Yoshiro Takahashi (yitk＠scphys.kyotou.ac.jp, ext. 3745)
 note

GCOE seminar
 title
 The ACME Electron EDM Experiment
 author

Nicholas R. Hutzler
（Harvard University, USA）
 date
 September 17(FRI), 2010, 15:30  16:30
 place
 Room 115［1F］, Physics Department
 abstract

 contact
 Yoshiro Takahashi (yitk＠scphys.kyotou.ac.jp, ext. 3745)
 note

GCOE seminar/Particle Physics Seminar
 title
Thermal effect on the Qballs and gravitational waves
 author

Kohei Kamada
（Reserch Center for the Early Universe, Univ. of Tokyo）
 date
 July 28, 2010, Wednesday 1:30pm−
 place
 Conference Room Y206, Yukawa Hall, Yukawa Institute, Kyoto University
 abstract

Qball formation associated with the AffleckDIne (AD)
mechanism is one of the interesting features of the MSSM flat direction.
In particular, when we consider the thermal effect, there emereges a
variety of scenarios of the AD mechanism and the Qball formation. In this
talk, I will show how thermal plasma affects the dynamics of the MSSM flat
direction and Qball properties. I also explain the cosmological
consequences of such features, especially the emission of the
gravitational waves and their detectability.
 contact
 Naoki Sasakura, Yukawa Institute（ext 7037）
 note

http://www.yukawa.kyotou.ac.jp/contents/seminar/detail.php?SNUM=51049
GCOE seminar
 title
 Key Symmetries of Superconductivity: Inversion and Time Reversal Symmetry
 author

Professor Manfred Sigrist
（ETH Institute for Theoretical Physics, Switzerland）
 date
 July 16th (FRI), 2010, 16:00 
 place
 The 4th Lecture Hall (Room 525) [5F], Physics Department
 abstract

Symmetries play an important role for superconductivity. At the superconducting
phase transition U(1)gauge symmetry is spontaneously broken and
in socalled unconventional superconductors even further symmetries
may be violated which give rise to extraordinary phenomena. Besides
this phenomenological symmetry concept there is also the microscopic
point of view that superconductivity is based on the formation of
Cooper pairs built of degenerate electronic states very close to the
Fermi surface. The availability of such degenerate electronic states
relies on two key symmetries, inversion and time reversal symmetry,
which allow for the most basic classification of superconductors
into evenparity (spin singlet) and oddparity (spintriplet) pairing.
The absence of any of these two symmetries yields a modification of the
Cooper pairing states with numerous implications. This presentation
will shed light some of the physical properties resulting from the
lack of time reversal and inversion symmetry and discusses examples,
which we encounter among ferromagnetic and noncentrosymmetric superconductors.
Special attention will be given to the later class in the light of recent
remarkable developments for the noncentrosymmetric heavy Fermion superconductors.
 contact
 Yoshiteru Maeno, maeno＠scphys.kyotou.ac.jp, ext.3783
 note

GCOE seminar
 title
 The Measure of the Universe A Crisis For Cosmology
 author

Professor George Efstathiou
(Kavli Institute for Cosmology Cambridge and Institute of Astronomy)
 date
 June 30 (Wed), 2008, 16:45  18:00
 place
 Room 301, the 6th building of Faculty of Science
 abstract

Recent developments in Cosmology and Theoretical Physics suggests
that our Universe is just one pocket in a Multiverse, possibly consisting
of an infinite number of infinite Universes. Furthermore, astronomical
observations have shown, to the surprise of most cosmologists, that the
expansion of our Universe is accelerating, rather than decelerating
under the action of gravity. This acceleration requires a small,
but nonzero, vacuum energy that is 120 orders of magnitude smaller
than predicted by fundamental physics. The existence of a Multiverse
may explain this puzzle, but a consistent cosmology requires an
understanding of how to tame infinities in the Multiverse. This
is the `Measure Problem'. Without a solution to this problem,
modern cosmology has boxed itself into a crisis.
 contact
 Misao Sasaki, misao＠yukawa.kyotou.ac.jp
 note

GCOE/YITP Seminar (Condensed Matter physics and Nuclear physics)
 title
 RG derivation of relativistic fluiddynamic equations for a viscous fluid
 author

Teiji Kunihiro
(Kyoto University)
 date
 22 April, 2010 (Thu) pm 13:30−
 place
 Panasonic Auditorium, Yukawa Hall, YITP, Kyoto University
 abstract

After a brief introduction to the fundamental issues on the theory of
relativistic fluid dynamic equations for a viscous fluid, we present
an attempt to derive relativistic fluiddynamic equations in general
local rest frames for a viscous fluid from the underlying relativistic
Boltzmann equation. Our method is based on the so called renormalizationgroup method as a
powerful reduction method of a dynamical system.
The local rest frames (LRF's) are specified by introducing a
macroscopic frame vector: The derived firstorder equations include
the Landau equation in the energy frame as a special case, but the
equation in the particle frame does not coincide with the Eckart one
which is known to have a pathological property that the thermal
equilibrium becomes unstable if the linear perturbation around the
equilibrium is described by this equation.
We show that our equation has no such a pathological property, and
discuss the origin of the difference between the two equations in the
particle frame: The dissipative part of the energymomentum tensor
$\delta T^{\mu\nu} $ in the particle frame satisfies $\delta T^\mu_\mu
= 0$ , in contrast to the Eckart choice $u_\mu \delta T^{\mu\nu} u_\nu
= 0$ adopted as a matching condition by Eckart and the subsequent
literature. We emphasize that the way how to impose the matching
condition is a fundamentl but has been an unsolved problem. This
problem is solved in a natural way by the introduction of the
macroscopic frame vector in our method.
In the final part, we briefly present a derivation of the secondorder
(IsraelStewart type) dissipative relativistic fluiddynamic equations in a
generic frame from the relativistic Boltzmann equation. The relaxation terms
in the energy and particle frames are given. Our results show that the
viscosities are frameindependent but the relaxation times are generically
framedependent.
We confirm that the dissipative part of the energymomentum tensor in the
particle frame satisfies $\delta T^\mu_\mu = 0$ obtained for the firstorder
equation. We show that the new constraint $\delta T^\mu_\mu = 0$ can be
compatible with the phenomenological derivation of hydrodynamics based
on the second law of thermodynamics.
 contact

 note

GCOE/YITP seminar（Astrophysics）
 title
 Phenomenological Aspects of Bounce Cosmology
 author

Yifu Cai
(Institute of High Energy Physics, Chinese Academy of Sciences)
 date
 April 20, 2010 (Tue) 16:00−
 place
 Conference Room K202, Yukawa Institute, Kyoto University
 abstract

In the talk, I will first introduce the singularity
problem in current paradigm of cosmology. Up to now, we have no idea of
solving this problem in current framework of theoretical physics. However,
we have opportunities to study potential observational signals of
solutions to cosmic singularities by virtue of effective field theory. I
will present two examples to illustrate the big bang singularity can be
replaced by a big bounce. I will also talk about the perturbation theory
in bounce cosmology, and show that it predicts sizable and
negative nongaussianities which can be measured by near future observations.
 contact

 note

http://www.yukawa.kyotou.ac.jp/contents/seminar/detail.php?SNUM=50977
GCOE/YITP seminar (Nuclear physics)
 title
 Threebody hadron resonances
 author

Alberto Martinez Torres
(YITP, Kyoto University)
 date
 April 14, 2010 (Wed) 15:00−
 place
 Conference Room K206, Yukawa Institute, Kyoto University
 abstract

We have solved the Faddeev equations for different
threebody hadron systems by using as input the twobody chiral tmatrices
obtained after solving the BetheSalpeter equations in a coupled channel
formalism. We have found several resonances in which the threebody
interaction is essential in order to describe its properties.
 contact

 note

http://www.yukawa.kyotou.ac.jp/contents/seminar/detail.php?SNUM=50978
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