Through the discoveries made by the network of the LIGO and Virgo gravitational wave detectors, we are enjoying the power of the new way of studying the universe. The power is obtained by sophisticated gravitational wave data analysis techniques, which enable us to look deep into the noisy detector data streams. Here in this talk, I would like to summarize the current findings out of the discoveries, and then review data analysis techniques utilized in the field. I also report on the status of the KAGRA gravitational wave detector built in Gifu prefecture, Japan and its future plan, as well as the data analysis activities for the KAGRA project.

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Among many exotic hadrons, I will focus on the poster boy: X(3872). First, the review on the past studies of X(3872) will be presented. Then, recent measurement of the absolute branching fraction of B-> K+ X(3872) decay and its impact on the nature of X(3872) is presented. Finally, prospect toward understanding of X(3872) at Belle II experiment is given.

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valid, but only at a qualitative level. We propose a set of quantities for which quantitative and non-perturbative calculation is possible using lattice QCD. A well-known example is related to the R-ratio of e+e - scattering. A primary target of the method discussed in this talk is the inclusive decays of B mesons. We discuss on how one can calculate its decay rate or some related quantities.]]>

In this talk, I explain why we need lattice QCD, how it works, what it can do, and briefly discuss some interesting areas of research in the field. I will also discuss my work studying the decay constants of B mesons on the lattice, relevant to flavour physics experiments like Belle II and LHCb.]]>

He will give an introductory lecture on flavor physics to graduate students, which he had given to students in the US.

Of course, the experts in theoretical or experimental studies are also welcome to join in.

]]>Starting from the fiscal year 2018, KMI gives a warm welcome to Prof. Makoto Kobayashi as the new Director General of the institute.

Succeeding the position after Prof. Toshihide Maskawa, Prof. Kobayashi is the second Director General of KMI since its establishment. Together with Prof. Kobayashi, who is one of the world leading theoretical physicsits full of wit and expansive ideas, KMI is just on the boad for its further development.

The SuperKEKB/Belle II project is the successor of the previous KEKB/Belle project, which contributed to establish the Standard Model by measuring the particle-antiparticle asymmetry (known as "CP violation") in B meson decays as predicted by the theory proposed by Prof. Makoto Kobayashi and Prof. Toshihide Maskawa, Nobel laureates in Physics in 2008.

Still, the SM cannot explain the central mysteries of the Universe: Why matter dominates and why anti-matter cannot be found ? What is dark matter ? etc. Hence physicists believe that New Physics beyond that Standard Model is required.

The SuperKEKB/Belle II project allows us to perform high sensitivity search for New Physics in variety of rare process of "heavy flavor particles", including the b-quark, c-quark and the tau-lepton.
Cosmic structures and gravitational waves in ghost-free scalar-tensor theories of gravity - Seminar
tag:www.kmi.nagoya-u.ac.jp,2018:/eng/seminar//38.1152
2018-03-12T07:00:00Z
2018-02-27T06:32:55Z
We study cosmic structures in the quadra...
KMI, Nagoya University
We study cosmic structures in the quadratic Degenerate Higher Order Scalar Tensor (qDHOST) model, which has been proposed as the most general scalar-tensor theory (up to quadratic dependence on the covariant derivatives of the scalar field), which is not plagued by the presence of ghost instabilities. We then study a static, spherically sym- metric object embedded in de Sitter space-time for the qDHOST model. This model exhibits breaking of the Vainshtein mechanism inside the cosmic structure and Schwarzschild-de Sitter space-time outside, where General Relativity (GR) can be recovered within the Vainshtein radius. We then look for the conditions on the parameters on the considered qDHOST scenario which ensure the validity of the Vainshtein screening mechanism inside the object and the fulfilment of the recent GW170817/GRB170817A constraint on the speed of propagation of gravitational waves. We find that these two constraints rule out the same set of parameters, corresponding to the Lagrangians that are quadratic in second-order derivatives of the scalar field, for the shift symmetric qDHOST.]]>
Unification of inflation and quintessence - Seminar
tag:www.kmi.nagoya-u.ac.jp,2018:/eng/seminar//38.1146
2018-03-07T08:00:00Z
2018-01-16T07:52:34Z
In this talk focus will be on the model...
KMI, Nagoya University

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"Since we started to develop the idea of the new experiment, it took more than 15 years to come to this stage. We are very much excited. The project provides young researchers, including graduate students, to find new phenomena and contribute to the progress of fundamental science.", said Prof. Toru Iijima, the director of the center for experimental studies, KMI, and also the leader of the World Research Unit for Heavy Flavor Particle Physics.

The team at Nagoya University led by Prof. Iijima is one of largest group in the collaboration, and plays leading roles in various aspects in the project: construction and operation of a particle detector, called "TOP counter", newly developed by the group, development of data handling methods using the high performance computers at KMI, and data analysis to find new phenomena.

The first collision of the electrons and positrons is expected in the coming month.

See the press release by KEK: https://www.kek.jp/en/newsroom/2018/03/22/0900/

]]>In this talk focus will be on the model independent aspects of the paradigm of quintessential inflation. The model building blocks required to unify late time acceleration with inflation will be presented. The alternative reheating mechanism will also be described in brief. We shall also present a successful model of Unification.

The review of modified gravity to describe the consistent universe history from inflation till dark energy era is given. The main attention is paid to F(R) gravity. It is shown the possibility to take into account quantum gravity effects within this approach. Autonomous dynamical system approach in F(R) gravity is developed. The possibility of constant-roll inflation as the element of unified inflation with dark energy in modified gravity is demonstrated. Some simple applications of modified gravity are discussed.