第9回国際レクチャーシリーズ(The 9th International Lecture Series)

新学術領域「量子クラスターで読み解く物質階層構造」では国際的に著名な研究者をお招きして、国際レクチャーシリーズを企画しています。今回は Carlo Barbieri氏 (Surrey U./Milano U./INFN) をお迎えします。また、最新の研究についてのセミナーもしていただく予定です。皆様の積極的な参加をお待ちしています。
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Lecturer: Prof. Carlo Barbieri (Surrey U./Milano U./INFN)
[Lecture]
Title: Self-consistent Green's function and other propagator based approaches to the fermionic many-body problem
[Date/Time ]
Feb. 1 (Mon) 16:00 - 17:30 (JST)
Feb. 2 (Tue) 16:00 - 17:30 (JST)
Feb. 5 (Fri) 16:00 - 17:30 (JST)

[Seminar]
Title: Ab Initio Computations of Ground States and Optical Potentials in Nuclei
[Date/Time ] 
Feb. 5 (Fri) 19:00 - 20:00 (JST) (night session style)

The lecture and seminar will be given on-line by zoom.
Please send an email to doi[at]ribf.riken.jp to obtain the zoom link.
If it becomes necessary to make a further announcement, we update the information in this page.
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[Abstract for Lecture]
　Correlations―intended as multiple-particle mechanisms that cannot be modelled by a pure mean-field potential―are the key aspect that enable us to understand the behaviour of a wide range of many-body problems, ranging from quantum liquids, to molecules and atomic nuclei. Because these aspects are often manifest in the fragmentation of the spectral strength which is encountered in one-particle addition and removal measurements, computational approaches based on Green’s function (a.k.a. propagator) theory have become a fundamental tool in many branches of physics.
  In this set of lectures I would like to discuss some of the most advanced methods that can be used nowadays for large scale computations of self-consistent Green’s functions. I will focus on the extensions of the formalism that have been introduced in recent years to describe many-nucleon interactions (three-, four-body forces) and the Gorkov approach to open shells systems. These developments were mostly pursued with nuclear physics in mind (my own field) and the need for handling the very complex strong force. But I will aim at discussing their relevance to other fields, like quantum chemistry and the electron gas.
  The need for advancing many-body theories is far from being concluded and the necessity to describe nuclear reactions will require clever new paths that merge Green’s function and Monte Carlo approaches. I plan to conclude discussing this and others open challenges ahead of us.

[Abstract for Seminar]
   In recent years, we have advanced high-performance computational many-body techniques, such as self-consistent Green’s function theory, that can be used to compute the spectral function (and correlations effects) of atomic nuclei but that also allow meaningful predictions of radii and binding energies up to masses of A~140.   This talk will review such progress and aim at giving a broader perspective of ab initio theory, in which large scale computations are not only used to benchmark the theories of nuclear forces but they can also help to constrain our insight about nuclear phenomena. I particular, I would like to cover three recent applications:  the charge distribution of Sn and Xe isotopes which is to be measured at RIKEN,  the performance of Lattice-QCD interaction in describing hyper nuclei, and the ab initio formulation of the optical potential as a path to learn the interplay between structure and reactions.

[Slides]
   Lecture
   Seminar

世話人：
肥山詠美子（東北大・理研）、中村隆司（東工大）、金田佳子（京大）、保坂淳（阪大RCNP)、土井琢身（理研）、金賢得（京大）、Pascal Naidon(理研）、富樫甫（九大）