Titles, Abstracts, and Slides

Abstract:
Information of the phase structure of many-flavor SU(3) gauge theory is of great interest for finding a theory which realizes dynamical electroweak symmetry breaking, the mechanism that governs the dynamical generation of the mass of elementary particles. We try to determine the phase of the SU(3) gauge theory non-perturbatively with lattice simulation varying the numbers of fundamental fermions. This project fully utilizes the high performance computing system "phi" installed in KMI.

Abstract:
We discuss modified gravitational theories to explain the current accelerated expansion of the universe, so-called dark energy problem. One of the most important parameter in this issue is the equation of state (EoS) for dark energy $w_{\mathrm{DE}} \equiv P_{\mathrm{DE}}/ \rho_{\mathrm{DE}}$, which is the ratio of the pressure $P_{\mathrm{DE}}$ of dark energy to the energy density $\rho_{\mathrm{DE}}$ of it. In particular, we investigate $w_{\mathrm{DE}}$ in $f(R)$ gravity as well as $f(T)$ theory, where $f$ is an arbitrary function, $R$ and $T$ are the Ricci and torsion scalars, respectively. We explicitly demonstrate that the future crossings of the phantom divide line $w_{\mathrm{DE}}=-1$ are the generic feature in the existing viable $f(R)$ gravity models [1]. In addition, we show that the crossing of the phantom divide line of $w_{\mathrm{DE}} = -1$ can be realized in the combined $f(T)$ theory even though it cannot be in the exponential or logarithmic $f(T)$ theory [2]. Furthermore, we study the effective equation of state for the universe when the finite-time future singularities occur in non-local gravity [3].
Main references:
[1] K. Bamba, C. Q. Geng and C. C. Lee, ``Generic feature of future crossing of phantom divide in viable $f(R)$ gravity models,'' JCAP 1011, 001 (2010) [arXiv:1007.0482 [astro-ph.CO]].
[2] K. Bamba, C. Q. Geng, C. C. Lee and L. W. Luo, ``Equation of state for dark energy in $f(T)$ gravity,'' JCAP 1101, 021 (2011) [arXiv:1011.0508 [astro-ph.CO]].
[3] K. Bamba, S. Nojiri, S. D. Odintsov and M. Sasaki, ``Screening of cosmological constant for De Sitter Universe in non-local gravity, phantom-divide crossing and finite-time future singularities,'' arXiv:1104.2692 [hep-th].

Abstract:
The LHC accelerator and the ATLAS and CMS detectors are performing spectacularly well, but so far no signature of the agent of electroweak symmetry breaking has been observed and the standard model Higgs boson has been ruled out over a large range of masses. In this talk I will outline the consequences of the limits on a standard model Higgs boson for dynamical models of electroweak symmetry breaking, in particular for traditional technicolor models and for Higgsless models.

Abstract:
Accretion onto a black hole can liberate ten per cent or more of rest mass energy as radiation and/or relativistic jets. It powers stellar mass black hole binaries like Cygnus X-1 and quasars, massive accreting black holes in galactic nuclei which determine the final stellar mass of a host galaxy. X-ray observations probe the innermost parts of the accretion flow where the primary power-law continuum is generated. Irradiation of the flow produces a characteristic reflection spectrum which, through relativistic blurring, carries imprints of the effects of strong gravity. These phenomena will be discussed and illustrated with recent X-ray observations of accreting black holes, covering a wide range of black hole mass and spin.

Abstract:
While the LHC experimentalists work to find evidence of physics beyond the standard model, lattice gauge theorists are working as well to characterize the range of possible phenomena in strongly-coupled models of electroweak symmetry breaking. I will summarize the current progress of the Lattice Strong Dynamics (LSD) collaboration on the flavor dependence of SU(3) gauge theories.

Abstract:
We will first review some recent highlights of measurements of B and D meson properties that have been carried out by the Belle collaboration. We will discuss the motivation for a future super B factory at KEK, as well as the requirements for the accelerator and for the detector. Finally, the status of the project will be presented together with the plans for the future.

Abstract:
We show that the Kobayashi-Maskawa phase can be obtained by spontaneous CP violation in E6 GUT with family symmetry. At the same time, SUSY CP problem can be solved. Note that Predicted mass spectrum of SUSY particles is consistent with the LHC's null result for the SUSY search.

Abstract:
The large-scale structure (LSS) of the universe has been providing valuable clues to elucidate the universe. In 1990s, the bubble-like structures in the LSS suggested the existence of the cosmological constant, before the discovery of the accelerated universe by supernovae surveys. In 2000s, it was found that the LSS is one of the most robust ways of constraining the nature of dark energy. Ambitiously large, future galaxy surveys of LSS are proposed for that purpose. Other fundamental physics such as the modified gravity, generation of the primordial non-Gaussianity can also be probed by LSS in such future surveys. I will review recent theoretical developments of the LSS and some advanced topics that I have recently developed.

Abstract:
A lot of TeV gamma-ray objects have been discovered recently. Many of them have no known counterpart in the other wavelengths. They are called "dark particle accelerators." What are they? What particle is the origin of the gamma-rays? X-ray observations can give a clue to clarify these questions. In my talk, some recent X-ray observations with the Suzaku satellite are summarized.

Abstract:
I will report on OPERA, Dark Matter Detection and technology applications of Nuclear Emulsion, including short explanation of the neutrino velocity measurement by OPERA.

Abstract:
We present the most recent results of neutrino oscillations measured by the T2K neutrino experiment. The T2K uese the hgh intensity neutrino beam produced in J-PARC, and oberves the oscillations by the Super-Kamiokande detector 300km away from J-PARC. In 2011, we find a hint of electron neutrino appearance in the muon neutrino beam. This is the FIRST evidence of non-zero value of theta_13 which is the third neutrino mixing angle. We also measure the neutrino oscillation precisely in the disappearance channel of muon neutrinos. We also show the future prospect of the neutrino program in Japan with the J-PARC accelerator neutrino beam, especially the Hyper-Kamiokande project.

Abstract:
Since the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory started operations in 2000, a lot of experimental data with outstanding quality have been reported. The highlights of them were (i) strong elliptic flow which suggests collectivity and thermalization are achieved; (ii) strong jet quenching which confirms that hot and dense matter is created after collisions; (iii) the quark number scaling of elliptic flow which indicates that the hot quark soup is produced. Together with phenomenological studies such as relativistic hydrodynamic models, recombination models and jet energy loss mechanism these experimental results led us to the discovery of strongly interacting quark-gluon plasma (sQGP) at RHIC. Furthermore Large Hadron Collider (LHC) has just started heavy ion collision operations which give us an opportunity to obtain detail information of sQGP. Here I will discuss the property of sQGP and the QCD phase diagram in relativistic heavy ion collisions from both points of view of phenomenological approach (a hybrid model of relativistic hydrodynamic model and hadron based cascade model) and of the first principles of QCD (lattice QCD).

Abstract:
In this talk I discuss new anomaly free discrete R symmetries which may be used with in the context of grand unified theories to define the Minimal Supersymmetric Standard Model by resolving the mu problem and the serious issue of proton decay due to dimension four and five baryon and lepton number violating operators.

Abstract:
We discuss what gauge/string duality tells us about the strong coupling dynamics of QCD. We formulate a model on the basis of an intersecting D4/D8-brane system, where a key ingredient is given by a 5d Yang-Mills-Chern-Simons theory. It is found that this model enables one to reproduce low energy aspects of hadron physics quantitatively. We also try to analyze mass spectra of highly massive mesons by making a semiclassical quantization of an open string in a curved background. It is shown that the results are again consistent with experimental data.

Abstract:
The LHC forward experiment is one of the LHC experiments motivated to constrain the hadronic interaction models used in the cosmic-ray physics. One of the most important themas in the astroparticle physics is to determine the origin and nature of the ultra-high-energy cosmic-rays reaching 10^20 eV. However the uncertainty in the analysis of the observed cosmic ray induced air showers is dominated by the uncertainty in the hadronic interaction at such high energy. LHCf can provide crucial data of the very forward particle cross sections, those are responsible to the air shower development. The first results obtained from the 7TeV p-p collisions at LHC and future plan of the LHCf experiment are presented together with the brief introduction of the ultra-high-energy cosmic-ray physics.

Abstract:
Contrary to popular beliefs, it is possible to explain Baryonic asymmetry of the Universe inside the Standard Model, provided inflation ended into a broken phase below the electroweak transition. Two important ingredients of the solution are multiquanta "Higgs bags", containing W,Z and top quarks, as well as sphaleron transitions happening inside these bags. Together, they provide baryon number violation at the level $10^{-2..3}$. Our recent calculations show that CP violation (due to the usual CKM matrix of quark masses in the 4-th order) leads to top-antitop population difference in these bags of about $10^{-9}$. (The numbers mentioned are not yet optimized and simply follow a choice made by some numerical simulations of the bosonic fields we used as a reference point.)

Abstract:
In dynamical models of electroweak symmetry breaking, one key challenge is providing the large mass of the top quark without causing large flavor-changing neutral currents or excessive weak isospin violation. Adding new strong dynamics that couples preferentially to the top quark is an interesting solution. This talk reviews the basic ideas of top color, topcolor-assisted technicolor, and top seesaw models and introduces the "top triangle moose" model as a low-energy effective theory that can interpolate between various models of this kind. Recent data from the Tevatron and the LHC is used to constrain these models and suggest which model-building directions are the most promising.

Abstract:
We approach the quantum Hall effect from the point of view of effective field theory. The consistency of the theory in curve space implies nontrivial physical consequences.

Abstract:
We review the recent results of the direct dark matter (WIMPs) search experiments and also report the status and prospects of the XMASS experiment which is now under commissioning in Kamoka. XMASS uses 100 kg fiducial mass of liquid xenon and aims to reach a spin independent cross section sensitivity of 10^-45 cm^2 in 5 years.

Abstract:
Cosmic gamma rays are produced by interactions of high-energy particles or decays of massive particles in the Universe. New gamma-ray observatories such as Fermi satellite and bunch of ground-based Cherenkov telescopes started operations in the past 10 years and revealed hundreds of astronomical gamma-ray sources. I will present the recent results to explore origin of cosmic rays, acceleration and radiation processes at extreme astrophysical conditions in relativistic jets from black-holes, and annihilation of WIMP dark matter via observations of cosmic gamma rays.

Abstract:
The year 2011 is another successful year for the LHC and their experiments. The accumulated integrated luminosity is approaching to 5 fb-1 per experiment, which is 5 times more than the plan set at the beginning of the year. Some highlights on the physics results from the ALTAS and CMS experiments will be presented in this talk, (except for Higgs searches and top quark measurements as these will be shown by the following speaker.) The operation plan of the LHC in the near and far future will also be discussed.

Abstract:
I present the latest results from LHC-ATLAS experiment at CERN. This presentation focuses on the top quark physics and Higgs boson searches based on about 1 /fb of data collected by ATLAS detector until summer 2011. The measurements of the the top quark pair production cross section and the top quark property are presented. The current sensitivity of the Higgs boson searches is also presented.

Abstract:
Deep connections between the very large -- the cosmos -- and the very small -- quarks -- have shaped the Universe we see today and entangled the agendas of particle physics and cosmology. I discuss the present state of cosmology and the big mysteries that point to new physics -- dark matter, dark energy, inflation and the baryon asymmetry of the Universe -- and the prospects for progress.