名古屋大学素粒子宇宙起源研究機構

Exploring physics of neutron star matter with gravitational waves from neutron star merger - Seminar

2019-01-30T08:00:00Z

Neutron stars provide us a unique laboratory for studying the physics of nuclear/hadronic matter. In particular, a merger event of binary neutron stars can be regarded as a cosmological collider experiment. With this ragard, there are a number of theoretical studies of constraining the equation of state of neutron star matter using gravitational wave (GW) from neutron star mergers. Then, In the spectacular event of GW170817, information of the equation of state are extracted from GW. The theoretical basis and recent progress, as well as future prospects of this research field will be presented and discussed.

Dark matter in Horndeski theory - Seminar

2019-01-17T08:00:00Z

Horndeski theory is the most general scalar-tensor theory which leads to the second-order equations of motion. In this talk, a subclass of the Horndeski theory with shift symmetry is applied to study the galaxy rotation curve and the cosmo- logical evolution with identifying the scalar field with the dark matter, while the cosmological constant explains the dark energy. I show an analytic solution which reproduces the inverse-square-law density distribution of dark matter halo, so that the observed rotation curve can be explained at the galactic scale. I also discuss the dark-matter-like behavior of the scalar field at the cosmological scale and consider the consistent parameter region between the galactic and cosmological scales.

Quark gluon plasma mapped over the QCD phase diagram with beam energy scan program at RHIC-BNL - Seminar

2018-12-19T08:00:00Z

High-temperature and high-density state of matter such as Quark Gluon Plasma (QGP), which is supposed to exist in early universe or inside the neutron stars, has been extensively studied in the laboratory at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider. Here two major discoveries are the large elliptic flow via collective flow of partons and the significant high transverse momentum suppression via energy-loss of energetic partons inside the QGP. One of the ultimate goal of QGP study is to locate critical point at the end of the first order phase boundary, which is expected in high-density area of the quantum chromo dynamics (QCD) phase diagram of quark-nuclear matter. This is accessible via lowering the colliding beam energy by large baryon stopping. The beam energy scan program phase II (BES-II) will be pursued in the next few years to search for a critical point and the first order phase transition. The recent results from RHIC experiments and the future plans in BES-II program will be presented and discussed.

Direct dark matter search with XENONnT - Seminar

2018-12-12T08:30:00Z

The XENON series of experiments has been highly successful in pushing the limits of WIMP direct searches for more than a decade. We are currently operating the XENON1T detector, the most sensitive dark matter detector ever built, at Laboratori Nazionali del Gran Sasso (LNGS). The XENON1T experimental setup and infrastructure were designed to allow for a fast upgrade of its central detector, a two-phase xenon Time Projection Chamber (TPC). The XENONnT project, the next phase of the program, will feature a new TPC with an active target of ~6 tonnes of Xenon (4 tonne fiducial) and will implement a series of technological solutions aiming to further suppress the dominant background sources and boost the physics reach of the experiment. In this talk, an update on the status and prospects of the XENONnT phase (especially Japan's contribution to the experiment) will be presented.

Precision Higgs Physics at LHC - Seminar

2018-12-11T06:00:00Z

After the discovery of the Higgs boson in July 2012, the precise study of the electroweak symmetry breaking mechanism that is responsible for the mass in the Standard Model (SM) has been one of the principal physics targets at Large Hadron Collider (LHC) at CERN. Higgs boson property measurements of 1) Higgs boson mass and decay width, 2) Higgs boson couplings to gauge bosons and fermions and 3) Higgs boson quantum numbers JPC and tensor structure has been studied in detail. Besides, 4) the Higgs potential with Higgs self-coupling λ is least known of today, and this remains as one of the key topics in future collider physics. The LHC accelerator has operated at the centre-of-mass energies at 7 and 8 TeV during 2010-2012, and has accumulated the integrated luminosity of about 25 fb−1 in total. LHC in RUN-2 has started in spring 2015 and lasted until October 24th 2018 by accumulating an integrated luminosity of 150fb−1 at the entre-of-mass energy of 13 TeV. By the end of 2023 (RUN-3), it is expected to accumulate data up to 300fb−1. The High-Luminosity-LHC (HL-LHC) is expected to start in 2026 aiming the integrated luminosity of 4 ab−1 by 2038. In the absence of the direct hint for the physics beyond the Standard Model (BSM) at LHC, it is of primary importance to pursue precision Higgs physics to search for the deviation from the SM and search for the BSM Higgs signal at LHC RUN-2&3 and HL-LHC. The so-called κ-framework used in RUN-1 by the LHC collaborations will no longer be adequate, because it cannot be improved beyond O(10%) precision and cannot capture all possible Higgs interactions that may arise in nature. Instead, the Higgs Effective Field Theory (EFT) is drawing a lot of attentions these days as general theoretical framework, which enables combining data with electroweak precision data, top-quark physics, etc. In the seminar, recent experimental results of Higgs property measurements and future prospects of precision Higgs physics with EFT will be discussed.

第２回KMIスクールを2月21日-23日に開催します - NEWS & TOPICS

2018-12-06T06:13:48Z

The 4th KMI International Symposium (KMI2019)を2月18日-20日に開催します - NEWS & TOPICS

2018-12-06T06:09:12Z

Bottomonia: exploring low energy QCD with heavy quarks - Seminar

2018-11-26T08:00:00Z

The Quantum-Chromodynamics can be regarded as an inner frontier of the standard model. Despite being understood in its high-energy regime, it still evades a comprehensive description when it comes to the low-energy, non-perturbative regime where most of the processes that are more relevant to our understanding of the ordinary matter take place. The formation of hadrons from colored quarks, the structure of the proton, and the inner structure of the neutron stars all belong to this still poorly understood sector of the standard model.
One of the many possible approaches to this problem is the study of the bound stats of heavy quarks. Heavy mesons, in particular the bottomonium states, offer a theoretically simple environment in which to test new description of the low energy color interaction on a wide scale of energies: from few MeV, up to several GeV when annihilation processes are considered.

In this seminar we will first outline the basic ideas and the status of the bottomonium physics. We will then describe more in detail the potential of the measurement that will be performed at the Belle II experiment, ranging from the spectroscopy of the tetraquark-like states to the study of the hyperon-hyperon interactions.

Type Ia supernova progenitor issue: recent progress and future prospect - Seminar

2018-11-21T08:00:00Z

Type Ia supernovae, widely believed to result from thermonuclear explosions of white dwarfs, are extremely important phenomena in the Universe, owing to their roles as distance indicators in cosmology. However, many of their fundamental aspects, e.g., how their progenitors evolve and explode, remain elusive. I will present recent progress in observational and theoretical studies toward solving this issue, and also discuss future prospects mainly for high-resolution X-ray spectroscopy of Type Ia supernova remnants with XRISM and Athena.

Fermion masses, proton decay and the strong CP problem in SUSY SO(10) - Seminar

2018-11-20T08:10:00Z

In this talk, I shall present new results on fermion masses and proton decay in the context of renormalizable SUSY SO(10) models. Difficulties with the minimal model are avoided by enlarging the symmetry breaking sector with a 54. Consistent fermion mass spectrum is obtained, including the neutrino sector. A mini-split SUSY spectrum is suggested by proton decay constraints, which is compatible with pure gravity mediation. A successful implementation of the Peccei-Quinn symmetry will be presented, in which case the model becomes compatible with proton lifetime with TeV scalars.

Development of Fast-timing MCP-PMT/LAPPD at Argonne National Laboratory - Seminar

2018-11-20T07:00:00Z

The Large Area Picosecond PhotoDetector (LAPPD) project is a multi-year project involving a number of institutions, with a goal to create a microchannel plate photodetector (MCP-PMT) that has the same very high performance as existing MCP-PMTs, but at a significantly lower cost. Recently, the LAPPD collaboration successfully commercialized the production of 20 × 20 cm² standard LAPPD^TM through the industrial collaborator.

Within the LAPPD project, a photodetector production facility dedicated to fabricating 6 × 6 cm² fast-timing MCP-PMTs was designed and built at Argonne National Laboratory. In this talk, I will report detailed design, fabrication and characterization of both 6 × 6 cm² MCP-PMTs and 20 × 20 cm² LAPPD^TM based on next-generation microchannel plates. The flexible photodetector design provides the potential of modifying individual components as well as the entire configuration to fit for different applications. Optimizations of current design driven by different applications such as particle identification, calorimeter and X-ray imaging will also be reported.

Japanese contributions to the Particle Data Group - Seminar

2018-11-14T08:45:00Z

The Particle Data Group (PDG) is an international collaboration that provides a comprehensive summary of Particle Physics and related areas of Cosmology. In this talk, I introduce Japanese contributions to the PDG activities. I also present recent PDG statistics and its operations which may be of interest to you.

KMI基礎理論研究センターでは、ただいま特任助教を募集しています - NEWS & TOPICS

2018-11-09T00:52:46Z

Deep learning and AdS/CFT - Seminar

2018-10-24T08:00:00Z

Deep learning is an advanced technology for artificial intelligence, and the research on it is developing rapidly in these years. The concept is based on neural networks and learning algorithms, while the basis has a lot of similarity to physical concepts such as differential equations,
discretization, statistical averaging and renormalization. Here we implement the deep neural network scheme into the AdS/CFT correspondence, a renowned quantum gravity formulation. The neural network is identified with the bulk gravity spacetime, and the input data such as lattice QCD data as for the boundary QFT will automatically let the bulk metric "emerge", and with the emergent metric we can calculate other QCD observables such as Wilson loops. We discuss possible relation between quantum gravity and deep learning, also from
the viewpoint of solving inverse problems, which deep learning is generically good at.

１１月１５ー１７日、国際研究ユニットのミニワークショップ、"Hints for New Physics in Heavy Flavors"が開催されます - NEWS & TOPICS

2018-10-18T07:23:31Z

名古屋大学 素粒子宇宙起源研究機構