Back Numbers 2015-16
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Schedule

April

• April 10, 2015
@@ Cosmological Collider Physics
@@@@K. Suehiro (Hokkaido Univ.)
• @E-PRINT : Nima Arkani-Hamed, Juan Maldacena, " Cosmological Collider Physics " arXiv:1503.08043[hep-th]

@COMMENT : Journal Club

• April 17, 2015
@@Non-supersymmetric heterotic model building
@@@@Y. Takano (Hokkaido Univ.)
• @E-PRINT : Michael Blaszczyk, Stefan Groot Nibbelink, Orestis Loukas, Saul Ramos-Sanchez,
@@@@@@@ " Non-supersymmetric heterotic model building " arXiv:arXiv:1407.6362

@COMMENT : Journal Club

• April 24, 2015
@@@@T. Houri (kobe Univ.)
• @@Liouville integrability of Hamiltonian systems and spacetime symmetry
@@ABSTRACT : Hamiltonian dynamical systems are said to be integrable in the Liouville sense if there exists a
@@@@@@@@@@maximal set of first integrals that are Poisson commuting with each other. However, it is not always
@@@@@@@@@@easy to find such a set of first integrals for a given system. In this talk, I will show that any natural
@@@@@@@@@@Hamiltonian dynamics can be rephrased as geodesic problem in a curved spacetime, where the
@@@@@@@@@@existence of first integrals in the original Hamiltonian system corresponds to the existence of
@@@@@@@@@@symmetry of the corresponding spacetime, and discuss on a technique for finding spacetime symmetry.

@@COMMENT : Seminar (Morning Session)

@@Killing-Yano symmetry and supergravity black holes
@@ABSTRACT : Killing-Yano symmetry has been thought of as hidden symmetry of spacetimes because thanks to
@@@@@@@@@@such symmetry equations of motion for test particles and test scalar and Dirac fields -
@@@@@@@@@@- Hamilton-Jacobi, Klein-Gordon and Dirac equations -- can be solved by separation of variables.
@@@@@@@@@@The most remarkable property of spacetimes admitting Killing-Yano symmetry is that when the
@@@@@@@@@@vacuum Einstein equation is assumed, metrics on such spacetimes are determined to be black
@@@@@@@@@@hole solutions. In this talk, I will discuss on black hole solutions admitting Killing-Yano symmetry
@@@@@@@@@@in the context of supergravity theory.

@@COMMENT : Seminar (Afternoon Session)

May

• May 1, 2015
@@Towards a Non-Supersymmetric String Phenomenology
@@@@H. Suzuki (Hokkaido Univ.)
• @E-PRINT : Steven Abel, Keith R. Dienes, Eirini Mavroudi, " Towards a Non-Supersymmetric String Phenomenology "
@@@@@@@@arXiv:1502.03087

@COMMENT : Journal Club

• May 8, 2015
@@Oscillations of the $$^7$$Be solar neutrinos inside the Earth
@@@@Y. Tobita (Hokkaido Univ.)
• @E-PRINT : A. N. Ioannisian, A. Yu. Smirnov, D. Wyler, " Oscillations of the $$^7$$Be solar neutrinos inside the Earth "
@@@@@@@@arXiv:1503.02183

@COMMENT : Journal Club

• May 15, 2015
@@@@S. Sugishita (Kyoto Univ.)
@@Ramond-Ramond couplings of D-branes
• @@ABSTRACT : We find the general Ramond-Ramond coupling formula including open string massive modes on
@@@@@@@@@@D9-branes in the context of the boundary string field theory (BSFT). For superstring theory,
@@@@@@@@@@the BSFT action of open string is given by a disk worldsheet partiton function with boundary
@@@@@@@@@@interactions corresponding to open string excitations. Applying the supersymmetric localization
@@@@@@@@@@technique to superstring worldsheet theory with arbitrary worldsheet-supersymmetric boundary
@@@@@@@@@@interactions, we find that a finite number of massive modes can contriute to Ramond-Ramond
@@@@@@@@@@coupling formula and that the formula is written in terms of Quillen's superconnection including
@@@@@@@@@@higher form fields. We also find that any D9-branes creation via condensation of massive modes
@@@@@@@@@@never happens.
@
@@E-PRINT : JHEP 1503 (2015) 077 arXiv:1501.00095[hep-th]

@@COMMENT : Seminar

• May 22, 2015
@@@@Y. Sato (Kyoto Univ.)
@@Comments on Entanglement Entropy in the dS/CFT Correspondence
• @@ABSTRACT : We consider the entanglement entropy in the dS/CFT correspondence. In Einstein gravity on
@@@@@@@@@@de Sitter spacetime we propose the holographic entanglement entropy as the analytic continuation
@@@@@@@@@@of the extremal surface in Euclidean anti-de Sitter spacetime. Even though dual conformal field
@@@@@@@@@@theories for Einstein gravity on de Sitter spacetime have not been known yet, we analyzed the
@@@@@@@@@@free Sp(N) model dual to Vasiliev's higher spin gauge theory as a toy model. In this model we
@@@@@@@@@@confirmed the behaviour similar to our holographic result from Einstein gravity.
@
@@E-PRINT : Phys.Rev. D91 (2015) 8, 086009 arXiv:1501.04903 [hep-th]

@@COMMENT : Seminar

• May 29, 2015
@@@@K. Hotta (Hokkaido Univ.)
@@Closed Superstrings at Finite Temperature in the Framework of Thermo Field Dynamics
• @@ABSTRACT : Although the finite temperature systems of strings have been mainly examined in the framework
@@@@@@@@@@of Matsubara formalism, quite a few works have been done to investigate these systems in the
@@@@@@@@@@framework of thermo field dynamics. Previously we have calculated the thermal vacuum state
@@@@@@@@@@and the partition function for a single closed superstring in the framework of thermo field dynamics.
@@@@@@@@@@From this we can reproduce the free energy for multiple strings in the case of Matsubara method.
@@@@@@@@@@However it is unsatisfactory to derive free energy in such a way, since the free energy for multiple
@@@@@@@@@@strings should be obtained by only calculating the expectation value of the corresponding operator
@@@@@@@@@@in the thermal vacuum state. In this talk, we compute the thermal vacuum state for multiple closed
@@@@@@@@@@superstrings based on free light-cone superstring field theory. From this we can reproduce the
@@@@@@@@@@free energy for closed superstrings in the case of Matsubara method. We comment on the relation
@@@@@@@@@@between this closed superstrings at finite temperature and the open superstrings on D9-brane-
@@@@@@@@@@-anti-D9-brane pairs.

@@COMMENT : Seminar

June

• June 5, 2015
@@@@M. Kakizaki (Toyama Univ.)
@@Dark matter in universal extra dimension models
• @@Abstract : Models where all the Standard Model particle propagate in extra dimensions, so-called universal
@@@@@@@@@extra dimension models, can be accompanied by symmetry related to their geometry. Due to the
@@@@@@@@@symmetry, the lightest first Kaluza-Klein (KK) particle that is a partner of one of the neutral
@@@@@@@@@standard model particles, mostly that of the hypercharge gauge boson is stabilized and thus an
@@@@@@@@@excellent candidate for dark matter. As a consequence, the first KK mode of hypercharge gauge
@@@@@@@@@boson can be a weakly interacting massive particle (WIMP) whose thermal relic abundance
@@@@@@@@@satisfies the observed dark matter abundance. In this talk, we focus this case and show that
@@@@@@@@@various first and second KK particles affect the amount of this WIMP candidate drastically. We
@@@@@@@@@also discuss experimental signatures of such models at direct and indirect dark matter detections
@@@@@@@@@as well as at on-going and future colliders.
@
@@References : G.Belanger, A.Belyaev, M.Brown, M.Kakizaki and A.Pukhov,
@@@@@@@@@@@@@@Phys. Rev. D 87, no. 1, 016008 (2013) @arXiv: 1207.0798[hep-ph]
@
@@@@@@@@ @@G.Belanger, M.Kakizaki and A.Pukhov, JCAP 1102, 009 (2011) @arXiv: 1012.2577[hep-ph]
@
@@@@@@@@ @@M.Kakizaki, S.Matsumoto and M.Senami, Phys. Rev. D 74, 023504 (2006) @arXiv: hep-ph/0605280
@
@@@@@@@@ @@M.Kakizaki, S.Matsumoto, Y.Sato and M.Senami, Nucl. Phys. B 735, 84 (2006) @arXiv: hep-ph/0508283
@
@@@@@@@@ @@M.Kakizaki, S.Matsumoto, Y.Sato and M.Senami, Phys. Rev. D 71, 123522 (2005) @arXiv: hep-ph/0502059

@@Comment : Seminar

• June 12, 2015
@@@@S. Kashiwase (Kanazawa Univ.)
@@Baryon Asymmetry and Inflation in a Radiative Seesaw Model
• @@Abstract : The standard model has serious problems from experimental and observational standpoints
@@@@@@@@@neutrino masses, dark matter and baryon asymmetry of the Universe. A radiative seesaw model is
@@@@@@@@@known as a candidate which could explain neutrino masses and existence of dark matter
@@@@@@@@@simultaneously. In addition, in this model, the sufficient baryon number asymmetry could be
@@@@@@@@@generated through resonant leptogenesis at TeV scale. We estimate the baryon number asymmetry
@@@@@@@@@and discuss the prospects in the dark matter direct search experiments. In addition to three
@@@@@@@@@problems, inflation should also be explained since the recent CMB observations suggest the
@@@@@@@@@existence of the inflationary era at the early stage of the Universe. Thus, we extend it by a
@@@@@@@@@complex scalar field with specific potential. We show that the inflation favored by the CMB
@@@@@@@@@observations could be realized even if inflaton takes sub-Plankian values during inflation.

@@Comment : Seminar

• June 19, 2015
@@ Resolving Witten's Superstring Field Theory
@@@@W. Akutsu (Hokkaido Univ.)
• @ E-PRINT : T. Erler, S. Konopka, I. Sachs, "Resolving Witten's Superstring Field Theory" arXiv:1312.2948 [hep-th]

@ Comment : Journal Club

• June 26, 2015
@@@@A. Sako (Tokyo university of science)
@@ Introduction to Noncommutative geometry
• @@@@Comment : Seminar (Morning Session)

@@ Noncommutative Gauge Theory on $$\mathbb{C}P^N$$
@ @@ Comment : Seminar (Afternoon Session)

July

• July 3, 2015
@@Effects of thermal inflation on small scale density perturbation
@@@@H. Hattori (Hokkaido Univ.)
• @E-PRINT : Sungwook E. Hong, Hyung-Joo Lee, Young Jae Lee, Ewan D. Stewart, Heeseung Zoe,
@@@@@@@@@@@@@@@@@@" Effects of thermal inflation on small scale density perturbation " arXiv:1503.08938

@Comment : Journal Club

• July 10, 2015
@@@@N. Umeda (Kyoto Univ.)
@@Random volumes from matrices
• @@Abstract : We propose a new class of models generating three-dimensional random volumes, where each
@@@@@@@@ configuration consists of triangles glued together along multiple hinges. The models are characterized
@@@@@@@@ by semisimple associative algebras, and the set of possible diagrams can be reduced by an
@@@@@@@ @appropriate large N limit such that they represent only (and all of the) tetrahedral decompositions of
@@@@@@@ @three-dimensional manifolds. We also give a prescription to put local matters on simplices of any
@@@@@@@ @dimensions (tetrahedra, triangles, edges and vertices). Simple examples include the Ising model
@@@@@@@ @coupled to three-dimensional quantum gravity. The three-dimensional colored tensor models can be
@@@@@@@ @obtained by putting specific matters on tetrahedra, triangles and edges at a time.
@
@@References : Masafumi Fukuma, Sotaro Sugishita, Naoya Umeda,
@@@@@@@@@@@@@@@@@@@@@@@@"Random volumes from matrices", @arXiv:1503.08812[hep-th]
@
@@@@@@@@ @@Masafumi Fukuma, Sotaro Sugishita, Naoya Umeda,
@@@@@@@@@@@@@@@@@@@@@@@@"Putting matters on the triangle-hinge models", @arXiv:1504.03532[hep-th]

@@Comment : Seminar

• July 17, 2015
@@Realistic three-generation models from SO(32) heterotic string theory
@@@@T. Tatsuishi (Hokkaido Univ.)
• @
@@E-PRINT : Hiroyuki Abe, Tatsuo Kobayashi, Hajime Otsuka, Yasufumi Takano,
@@@@@@@@" Realistic three-generation models from SO(32) heterotic string theory " arXiv:1503.06770 [hep-th]
@
@@Comment : M2 Journal Club (Morning Session)

@@Domain wall in the NMSSM
@@@@N. Omoto (Hokkaido Univ.)
@
@@E-PRINT : M. Kawasaki and F. Takahashi,
@@@@@@@@@@@@@" Late-time entropy production due to the decay of domain wall" arXiv:hep-ph/0410158
@
@@@@@@@@@T. Asaka, M. Kawasaki,
@@@@@@@@@@@@@ @ @"Cosmological Moduli Problem and Thermal Inflation Models" arXiv:hep-ph/9905467
@
@@Comment : M2 Journal Club (Afternoon Session)

• July 24, 2015
@@@@R. Nagai (Nagoya Univ.)
• @@Unitarity, Electroweak Precision Physics, and Higgs couplings
@
@@Abstract :@@We discuss perturbative unitarity in the 2 -> 2 scattering amplitudes of the longitudinal massive
@@@@@@@@@spin-1 particles. It is naively broken down in the high energy limit since the longitudinal
@@@@@@@@@polarization vector grows as energy.
@@@@@@@@@@ One way to cancel the bad behavior in the amplitudes is to impose gauge symmetry and to add
@@@@@@@@@spin-0 particles (gHiggsh bosons). These Higgs coupling strengths with massive spin-1 particles
@@@@@@@@@are required to satisfy a set of condition, which is known as gunitarity sum rules[1]h
@@@@@@@@@@ We (re)visit the unitarity sum rules in the context of the SU(2)~U(1) gauge theory with
@@@@@@@@@arbitrary neutral Higgs bosons. Furthermore, we discuss the implication of the unitarity sum
@@@@@@@@@rules to the electroweak precision tests(EWPTs)[2], which have not been clarified in earlier literature.
@@@@@@@@@@ Finally, we investigate the mass of the extra neutral Higgs bosons applying the unitarity sum
@@@@@@@@@rules. We find the EWPTs gives us a severe constraints on upper bass bound on the second
@@@@@@@@@lightest neutral Higgs boson.
@
@@Comment : Seminar (Morning Session)

@@The ATLAS 2TeV diboson anomalies and Unitarity sum rules
@
@@Abstract :@@We investigate Wf interpretations for the ATLAS 2TeV diboson anomalies from the view point
@@@@@@@@@of the perturbative unitarity in the longitudinal gauge boson scattering amplitudes.
@@@@@@@@@@We derive a set of unitarity sum rules in a class of models with the custodial symmetry including
@@@@@@@@@arbitrary number of the custodial triplet vector bosons (W,Wf,Wffc) and neutral Higgs bosons
@@@@@@@@@(h,hf,hffc). We then find the unitarity sum rules give us non-trivial relations among WWZf,
@@@@@@@@@WZWf,hWWf, and hZZf coupling strengths.
@@@@@@@@@@Applying the unitarity sum rules, we perform surveys in the general parameter space of Wf
@@@@@@@@@models. It is found that the non standard-model-like Higgs boson is favored by the present data
@@@@@@@@@to interpret the ATLAS diboson anomalies as the consequences of the Wf and Zf bosons.
@
@@Comment : Seminar (Afternoon Session)

@
@@E-PRINT : [1] J.F.Gunion, H.E.Haber, and J.Wudka Phys.Rev. D43 (1991) 904-912 "Sum rules for Higgs bosons"
@@@@@@@@@@
@
@@@@@@@@@[2] R.Nagai, M.Tanabashi, and K.Tsumura Phys.Rev. D91 (2015) 034030 aXiv: 1409.1709
@@@@@@@@@@@"Does unitarity imply finiteness of electroweak oblique corrections at one-loop?
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@-constraining extra neutral Higgs bosons-"
@
@@@@@@@@@[3] R.Nagai, M.Tanabashi, and K.Tsumura Phys.Rev. D91 (2015) 034030 arXiv:1507.01185
@@@@@@@@@@@@@@@@@"Unitarity sum rules, three site moose model, and the ATLAS 2 TeV diboson anomalies"

• July 31, 2015
@@Dark Matter Searches in Supersymmetric Models
@@@@A. Kaneko (Hokkaido Univ.)
• @
@@E-PRINT : G. Jungman, M. Kamionkowski, K. Griest,g Supersymmetric Dark Matter g arXiv:hep-ph/9506380
@
@@Comment : M2 Journal Club (Morning Session)

@@Holographic reprsentation of local operators in de Sitter space
@@@@T. Suzuki (Hokkaido Univ.)
@
@@E-PRINT : X. Xiao,g Holographic reprsentation of local operators in de Sitter spaceg arXiv:1402.7080
@
@@Comment : M2 Journal Club (Afternoon Session)

@@Investigation of Gauge-gravity duality via simulations of 2D N=(8,8) super Yang-Mills
@@@@E. Gigu$$\acute{{\mathrm e}}$$re (Hokkaido Univ.)

@COMMENT : Seminar (for sutudents)

August

• August 3, 2015
@@Soft theorem and consistency relations for the primordial perturbations
@@@@Y. Urakawa (Nagoya Univ.)
• @
@@Abstract :@@In quantum field theory, it is widely known that a symmetry leads to a corresponding
@@@@@@@@@@Ward-Takahashi (WT) identity. For the primordial perturbations, the WT identity of the scaling
@@@@@@@@@@symmetry gives the consistency elation, which connects the (n+1)-point function of the curvature
@@@@@@@@@@perturbation with one soft xternal leg to the n-point function. We show that the consistency
@@@@@@@@@@relation implies the conservation of the curvature perturbation at large scales in holographic
@@@@@@@@@@inflation and also in two field models with isocurvature loops.
@@@@@@@@@@In the morning session, I'll give a brief review on inflation and (if I have time) also on a holographic
@@@@@@@@@@description of inflationary scenario, which provides an alternative description of inflation.
@@@@@@@@@@Then, in the afternoon session, I'm going to talk about our recent works.
@
@@E-PRINT : Jaume Garriga, Yuko Urakawa (Barcelona U., Dept. Fund. Phys. & ICC, Barcelona U.),
@@@@@@@@@g Inflation and deformation of conformal field theoryg arXiv:1303.5997 [hep-th]
@
@@Comment : Informal seminar

• August 4, 2015
@@How one determines alpha_s on the lattice ?
@@@@Rainer Sommer (DESY, Hamburg)
• @
@@Comment : Informal seminar

• August 7, 2015
@@Lepton flavour violation in the inverse seesaw and its supersymmetric realization
@@@@C$$\acute{{\mathrm e}}$$dric Weiland (Universidad Aut$$\acute{{\mathrm o}}$$noma de Madrid)
• @
@@Abstract :@@The discovery of neutrino oscillations more than a decade ago called for an extension of the
@@@@@@@@@@Standard Model that would generate neutrino masses and mixing. We considered a specific
@@@@@@@@@@mechanism, the inverse seesaw, that introduces new fermionic gauge singlets around the TeV
@@@@@@@@@@scale with large couplings to SM leptons. This leads to a rich phenomenology and makes it easily
@@@@@@@@@@testable at current and future experiments. After describing the inverse seesaw and its
@@@@@@@@@@embedding in a supersymmetric framework, we will discuss their predictions for lepton flavour
@@@@@@@@@@violating (LFV) observables in light of the recent CMS excess in the Higgs to tau mu channel and
@@@@@@@@@@future experimental sensitivities to LFV lepton decays.
@
@@Comment : Informal Seminar

• August 26, 2015
@@LHC phenomenology of natural MSSM with non-universal gaugino masses at the unification scale
@@@@J. Kawamura (Waseda Univ.)
• @
@@Abstract :@@We study collider phenomenology in the supersymmetric Standard Model with a certain type of
@@@@@@@@@@non-universal gaugino masses at the gauge coupling unification scale, motivated by the little
@@@@@@@@@@hierarchy problem. In this scenario, especially the wino mass is relatively large compared to the
@@@@@@@@@@gluino mass at the unification scale, and the heavy wino can relax the fine-tuning of the higgsino
@@@@@@@@@@mass parameter,so-called parameter. Besides, it will enhance the lightest Higgs boson mass
@@@@@@@@@@due to the relatively large left-right mixing of top squarks through the renormalization group (RG)
@@@@@@@@@@effect. Then 125GeV Higgs boson could be accomplished, even if the top squarks are lighter than
@@@@@@@@@@1TeV and the parameter is within a few hundreds GeV. The right-handed top squark tends to
@@@@@@@@@@be lighter than the other sfermions due to the RG runnings, then we focus on the top squark
@@@@@@@@@@search at the LHC. Since the top squark is almost right-handed and the higgsinos are nearly
@@@@@@@@@@degenerate, 2b + MET channel is the most sensitive to this scenario. We figure out current and
@@@@@@@@@@expected experimental bounds on the lightest top squark mass and model parameters at the
@@@@@@@@@@gauge coupling unification scale.
@
@@E-PRINT : Hiroyuki Abe, Tatsuo Kobayashi, Yuji Omura,
@@@@@@@@@@@@@g Relaxed fine-tuning in models with non-universal gaugino massesg arXiv:hep-ph/0703044
@
@@@@@@@@@Hiroyuki Abe, Junichiro Kawamura, Hajime Otsuka,
@@@@@@@@@g The Higgs boson mass in a natural MSSM with nonuniversal gaugino masses at the GUT scaleg
@@@@@@@@@arXiv:1208.5328
@
@@@@@@@@@Hiroyuki Abe, Junichiro Kawamura, Yuji Omura,
@@@@@@@@@g LHC phenomenology of natural MSSM with non-universal gaugino masses at the unification scaleg
@@@@@@@@@arXiv:1505.03729
@
@@Comment : Informal seminar

September

• September 1, 2015@
@@ Particle physics and cosmology in 5D SUGRA
@@@@H. Otsuka (Waseda Univ.)
• @
@@Abstract :@@We discuss high- and low-scale SUSY breaking scenarios in the five-dimensional supergravity
@@@@@@@@@@model on S^1/Z_2. The extra U(1) symmetries broken by the orbifold projection control the
@@@@@@@@@@flavor structure of soft SUSY-breaking parameters as well as the Yukawa couplings, and a
@@@@@@@@@@scalar component of the one of moduli multiplets, which arise from extra-dimensional
@@@@@@@@@@components of the U(1) vector multiplets, induces the slow-roll inflation. Because of the
@@@@@@@@@@supersymmetric moduli stabilization as well as the moduli inflation, it is found that the correct
@@@@@@@@@@dark matter relic abundance can be realized in both high- and low-scale SUSY breaking scenarios.
@@@@@@@@@@@Finally, we embedd the five-dimensional theory into the type IIB string theory on warped throat.
@
@@Comment : Informal Seminar

• September 8-10, 2015@
@@@@Y. Ookouchi (Kyushu Univ.)
@@ Introduction to superstring theories I, II
@
@@Comment : Intensive Lecture@@(Bldg.3@3|202)

• September 10, 2015@
@@ Baryon as Impurity for Phase Transition in String Landscape
• @
@@Abstract :@@We consider a decay of a false vacuum in flux compactifications of type IIB string theory and
@@@@@@@@@@study a catalytic effect for a hase transition induced by a new type of impurities.
@@@@@@@@@@We concentrate on the large $N$ dual of a D5-brane/anti-D5-brane system which has a rich
@@@@@@@@@@vacuum structure. We show that D3-branes wrapping the 3-cycles can form a dibaryon and make
@@@@@@@@@@a bound state with a monopole. We find that these baryon-like objects can make the lifetime of
@@@@@@@@@@the metastable vacuum shorter.
@
@@Comment : Seminar

October

• October 2, 2015
@@@@K. Isikawa (Hokkaido Univ.)
@@ 1. Dirac, von Neumann,@Fermi, ɂJڊmvZ@̖_
@@ 2. JڊmA@P=Gamma T +P^(d)Aɂ␳P^(d) ̓A炷ʁEe
• @
@Comment : Seminar (morning session)

@@ 3. j[gmE𒆐SɂP^(d)̂炷
@
@@E-PRINT : K.Ishikawa and Y.Tobita, Prog. Theor. Exp.Phys. 2013,073B02(2013)
@
@@@@@@@@@K.Ishikawa and Y.Tobita, Ann of Phys. 344,118(2014)
@
@@@@@@@@@K.Ishikawa, T.Tajima, and Y.Tobita, Prog. Theor. Exp.Phys. 2015,013B02(2015)
@
@@@@@@@@@K.Ishikawa and Y.Tobita, arXiv :1503.07285[hep-ph] ,in preparation
@
@@@@@@@@@K.Ishikawa, T.Sloan, and Y.Tobita, "On SN1987 A neutrino in the Galaxy"
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@in preparation ΐ쌒OhtF~̉ h@m[gA
@
@@Comment : Seminar (afternoon session)

• October 9, 2015
@@ Nonplanar operator mixing and negative anomalous dimensions
@@@@Y. Kimura (OIQP)
• @
@@E-PRINT : Yusuke Kimura, Ryo Suzuki, arXiv:1503.06210 [hep-th]
@
@@Comment : @This seminar is canceled.

• October 16, 2015
@@ Primordial black hole formation from cosmological fluctuations
• @
@@Abstract :@@Primordial black holes are black holes which may have formed in the early universe and affected
@@@@@@@@@the subsequent evolution of the universe through Hawking radiation and as the source of gravitational
@@@@@@@@@field. To predict the abundance of primordial black hole formation for given cosmological scenarios,
@@@@@@@@@it is essential to determine the formation threshold for primordial cosmological fluctuations, which
@@@@@@@@@are naturally described by cosmological long-wavelength solutions. After a brief introcution, I will
@@@@@@@@@talk the recent analytical and numerical results on the primordial black hole formation.
@@@@@@@@@@This talk is based on our recent work [1, 2].
@
@@E-PRINT : [1] T. Harada, C. M. Yoo, T. Nakama and Y. Koga,
@@@@@@@@@@@@@@@@@@@@@@@Phys. Rev. D 91 (2015)8, 084057 arXiv:1503.03934 [gr-qc]
@
@@@@@@@@@[2] T. Harada, C. M. Yoo and K. Kohri,
@@@@@@@@@@ Phys. Rev. D 88 (2013) 8, 084051 [Phys. Rev. D 89 (2014) 2, 029903] arXiv:1309.4201 [astro-ph.CO]
@
@@Comment : Seminar

@@ Introduction to Supersymmetry
@@@@H. Kato (Hokkido Univ.)
@
@@Comment : M1 Journal Club

• October 23, 2015
@@ The structure of neutrino Majorana mass and $$\mu$$-term induced
@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@by rigid instatons on Z$$_2$$~Z$$_2'$$ toroidal orbifold

@@@@S. Uemura (Kyoto Univ.)
• @
@@Abstract :@@@Dp-brane insatntons are Dp-branes localized at points in 4 dimensional Minkowski space and
@@@@@@@@@@warapping on (p+1)-cycles in 6 dimensinal compact space. D-brane instantons are important
@@@@@@@@@@non-perturbative effects because they can generate perturbatively forbidden interactions in
@@@@@@@@@@D-brane models, for example neutrino Majorana masses, Higgs mu-terms and so on.
@@@@@@@@@@@ In this seminar, I review intersecting D-brane modelbuilding briefly and talk about D-brane
@@@@@@@@@@instantons. Then, I compute non-perturbative superpotential in toroidal orbifold, especially
@@@@@@@@@@Majorana mass of right-handed neutrino and mu-terms of Higgs on toroidal orbifold.
@@@@@@@@@@@ I discuss its phenomenological implications for the flavor structure of leptons too.
@
@@Comment : Seminar

• October 30, 2015
@@ Introduction to Classical Mirror Symmetry
@@@@M. Jinzenji (Hokkaido Univ.)
• @
@@Contents : @1. T-duality of Bosonic Closed String on S$$^1$$
@@@@@@@@@@2. Compactification of Heterotic String Theory and Mirror Symmetry
@@@@@@@@@@3. Mathematical Prediction of Mirror Symmetry
@@@@@@@@@@4. Topics after 1991
@
@@Comment : Journal Club

November

• November 6, 2015
• @@ TITLE: TBA
@@@@T. Sasaki (Hokkido Univ.)
@
@@Comment : M1 Journal Club @(start at 14:30-)

@@ Particle cosmological probes on light dark matter
@
@@Abstract :@@he constraints on the light (the mass below GeV-scale) dark matter will be discussed. A few
@@@@@@@@@@examples will be presented, including the constrains from the collider, supernovae, Sun and the
@@@@@@@@@@large scale structure (21cm), to illustrate the complementarity between the particle physics and
@@@@@@@@@@cosmology probes.
@
@@E-PRINT :@ KK and Joe Silk, Phys. Rev. D89 (2014) 103528
@
@@@@@@@@@@Hiroyuki Tashiro, Kenji Kadota, Joseph Silk, Phys.Rev. D90 (2014) 8, 083522
@
@@@@@@@@@@Kenji Kadota, Yi Mao, Kiyomoto Ichiki, Joseph Silk, JCAP 1406 (2014) 011
@
@@@@@@@@@@Ilidio Lopes, Kenji Kadota, Joseph Silk, Astrophys.J.Lett. 780 (2014) L15
@
@@Comment : Seminar @(start at 15:30-)

• November 13, 2015
@@ De Sitter vacua from a D-term generated racetrack potential
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@in hypersurface Calabi-Yau compactifications

@@@@T. Kobayashi (Hokkaido Univ.)
• @
@@E-PRINT :@ Andreas P. Braun, Markus Rummel, Yoske Sumitomo, Roberto Valandro, arXiv:1509.06918[hep-th]
@
@@Comment : Journal Club

@@ Supersymmetry and Grand Unified Theory
@@@@N. Fukuhara (Hokkido Univ.)
@
@@Comment : M1 Journal Club

• November 20, 2015
@@ Constraints on Dark Matter in the Inert Doublet Model from Run1 of LHC
@@@@E. Park (Hokkaido Univ.)
• @
@@E-PRINT :@ A. Goudelis,
@@@@@@@@@"Status of the Inert Doublet Model of dark matter after Run-1 of the LHC",arXiv: 1510.03993[hep-ph]
@
@@@@@@@@@@G. Belanger, B. Dumont, A. Goudelis, B. Herrmann, S. Kraml, D. Sengupta,
@@@@@@@"Dilepton constraints in the in the Inert Doublet Model from Run1 of the LHC",@arXiv:1503.07367[hep-ph]
@
@@Comment : Journal Club

• November 27, 2015
@@@@Y. Shimizu (KIAS)
@@ Neutrino physics and non-Abelian discrete flavor symmetry
• @
@@Abstract :@@The experiments of neutrino oscillation go into a new phase of precise determination of the
@@@@@@@@@@mixing angles and mass squared differences. The T2K experiment, which has already confirmed
@@@@@@@@@@the neutrino oscillation in the $$\nu _\mu$$ $$\to$$ $$\nu _e$$ appearance events, provides us the new information of
@@@@@@@@@@the CP violating Dirac phase by combining the data of reactor experiments.
@@@@@@@@@@We discuss the neutrino flavor model by using non-Abelian discrete symmetry as flavor symmetry
@@@@@@@@@@in order to explain these experimental results.
@
@@Comment : Morning Session

@@ Relation between Dirac and Majorana phases in $$S_4$$ model of neutrinos
@
@@Abstract :@@We present two new simple lepton flavor models in the framework of the $$S_4$$ flavor symmetry.
@@@@@@@@@@We discuss the neutrino mass matrices, which are given by two complex parameters. In our model,
@@@@@@@@@@because of the less parameters, we predict the only inverted mass hierarchy. The charged lepton
@@@@@@@@@@mass matrix has the 1-2 lepton flavor mixing, which gives the non-vanishing reactor angle $$\theta _{13}$$.
@@@@@@@@@@These models predict the Dirac phase and the Majorana phases, which are testable in the
@@@@@@@@@@future experiments.
@
@@Comment : Afternoon Session

@
@@E-PRINT :@ H. Ishimori, T. Kobayashi, H. Ohki, Y. Shimizu, H. Okada and M. Tanimoto,
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@Prog. Theor. Phys. Suppl. 183 (2010) 1,@arXiv:1003.3552 [hep-th]
@
@@@@@@@@@@Y. Shimizu, M. Tanimoto and A. Watanabe,
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@Prog. Theor. Phys. 126 (2011) 81,@arXiv:1105.2929 [hep-ph]
@
@@@@@@@@@@Y. Shimizu, M. Tanimoto and K. Yamamoto,
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@Mod. Phys. Lett. A30 (2015) 1550002,@arXiv:1405.1521 [hep-ph]
@
@@@@@@@@@@Y. Shimizu and M. Tanimoto, arXiv:1507.06221 [hep-ph]

December

• December 4, 2015
@@ Entanglement Holography
@@@@R. Nakayama (Hokkaido Univ.)
• @
@@E-PRINT :@ J. de Boer, M.P. Heller, R.C. Meyers and Y. Neiman, arXiv:1509.00113 [hep-th]
@
@@Comment : Journal Club

@@ Conformal Symmetry
@@@@Y. Nishimura (Hokkido Univ.)
@
@@Comment : M1 Journal Club

• December 11, 2015
@@ From Data to Models to Theories
@@@@Pyungwon Ko (KIAS)
• @
@@Comment : Seminar @(start at 13:30-)

@@ Noether's Theorem in Field Theory
@@@@K. Ueda (Hokkido Univ.)
@
@@Comment : M1 Journal Club

• December 18, 2015
@@ Generalized Global Symmetries
@@@@N. Shimode (Hokkido Univ.)
• @
@@E-PRINT :@ [1] Davide Gaiotto, Anton Kapustin, Nathan Seiberg, Brian Willett, arXiv:1412.5148[hep-th]
@
@@@@@@@@@@[2] Eric Sharpe, arXiv:1508.04770[hep-th]
@
@@Comment : Journal Club

January

• January 15, 2016
@@ Non-planar operator mixing and negative anomalous dimensions
@@@@Y. Kimura (OIQP)
• @
@@Abstract :@@We study the one-loop anomalous dimension of so(6) singlet multi-trace operators in N=4 Super
@@@@@@@@@@Yang-Mills theory. We will first review the operator mixing problem.
@@@@@@@@@@The main part of this talk is based on work with Ryo Suzuki [1503.06210], where it is shown that
@@@@@@@@@@the planar zero modes get a negative anomalous dimension by including non-planar corrections.
@
@@Comment : Seminar

@@ Relaxion from N axions
@@@@Kiwoon Choi (CTPU, IBS)
@
@@Abstract :@@The relaxion mechanism which was proposed recently to solve the gauge hierarchy problem requires
@@@@@@@@@@a big hierarchy between the involved axion scales. In this talk, I discuss a novel scheme to generate
@@@@@@@@@@a big hierarchy in axion scales, without introducing a fine tuning of continuous parameters or an
@@@@@@@@@@unreasonably large number of degrees of freedom.
@
@@Comment : Seminar

• January 22, 2016
@@Toward the Standard Model from SO(32) heterotic string theory
@@@@T. Tatsuishi (Hokkaido Univ.)
• @
@@Comment : Rehearsal of Master Thesis Presentation (Morning Session)

@@Domain Wall in the NMSSM
@@@@N. Omoto (Hokkaido Univ.)
@
@@Comment : Rehearsal of Master Thesis Presentation (Afternoon Session)

• January 29, 2016
@@TITLE : TBA
@@@@A. Kaneko (Hokkaido Univ.)
• @
@
@@Comment : Rehearsal of Master Thesis Presentation (Morning Session)

@@dS/CFT correspondence and boundary conditions at future infinity
@@@@T. Suzuki (Hokkaido Univ.)
@
@@Comment : Rehearsal of Master Thesis Presentation (Afternoon Session)

February

• February 5, 2016
@@ SO(32) heterotic string theoryɂfqW͌^̓oɌ
@@@@T. Tatsuishi (Hokkaido Univ.)
@@ ŏΏ̕W͌^ڂF_ւ̉e
@@@@N. Omoto (Hokkaido Univ.)
@@ Phenomenological Constraints on Neutralino Dark Matter in cMSSM
@@@@A. Kaneko (Hokkaido Univ.)
@@ dS/CFTΉƎԓIɂ鋫E
@@@@T. Suzuki (Hokkaido Univ.)
• @
@@Comment : Short Rehearsal of Master Thesis Presentation (start at 10:30-)

@@ Majorana Dark Matter Search: Pure Singlet and Singlet-Doublet mixed Case
@@@@Yue-Lin Sming Tsai (IPMU)
@
@@Abstract :@ Majorana Dark matter (DM) model can be classified by their electroweak charge. In this talk I will
@@@@@@@@@start with singlet DM effective theory (EFT) and then move to singlet-doublet mixed case.
@@@@@@@@@In singlet case, we will present a global picture by taking all the operators and DM constraints into
@@@@@@@@@account. However, the EFT is no longer valid with current LHC 8 TeV region. Therefore, by the help
@@@@@@@@@from UV models, this problem can be fixed non-trivially. The current monojet and dijet constraint
@@@@@@@@@power will be presented. Moreover, a future prospect on the future DM direct detections and e+e-
@@@@@@@@@colliders (CEPC and ILC) will be also demonstrated. In the second part of talk, I will show some of
@@@@@@@@@our preliminary result on singlet-doublet mixed DM model by using the similar manner. The present,
@@@@@@@@@near future, and far future status of singlet-doublet mixed DM will be shown in this seminar.
@
@@Comment : Seminar (start at 13:30-)

• February 8-10, 2016@
@@ GlM[kgb̎ƕPEQ
@@@@H. Sakamoto (Tokyo Univ.)
@
@@Comment : Intensive Lecture@@

• February 12, 2016
@@ TITLE : TBA
@@@@B. -H. Lee (APCTP)
• @
@@Comment : Seminar

• February 19, 2016
@@ Matrix Model Regularization of Super Yang-Mills
@@@@N. Kawamoto (Hokkido Univ.)
• @
@@Abstract :@@I try to explain g How matrix model can avoid lattice SUSY difficulties and keep exact
@@@@@@@@@@supersymmetry even after regularization ? hbased on the works by A.Tsuchiya et. al.
@
@@Comment : Journal Club

• February 22, 2016
@@ An entanglement analogue in light cones
@@@@F. Morikoshi (NTT Basic Research Laboratories)
• @
@@Comment : Informal Seminar (start at 13:30-)

• February 26, 2016
@@ Complete action of open superstring field theory
@@@@Y. Okawa (Tokyo Univ.,Komaba)
• @
@@Abstract :@@In formulating superstring field theory, construction of an action including the Ramond sector
@@@@@@@@@@has not been successful for about thirty years, and this has been a major obstacle. This August
@@@@@@@@@@we finally succeeded in constructing a gauge-invariant action of open superstring field theory
@@@@@@@@@@including both the Neveu-Schwarz sector and the Ramond sector. This is the first construction
@@@@@@@@@@of a complete formulation of superstring field theory. In this talk, we explain the construction of
@@@@@@@@@@the complete action without assuming any background on string field theory. The talk is based on
@@@@@@@@@@the paper arXiv:1508.00366 in collaboration with Kunitomo.
@
@@Comment : Seminar