特別講演

How the Green Light Was Given for Gravitational Wave Search
開催日時
2022/11/09 水 02:29 - 02:29
講演者
Pawel Nurowski
講演者所属
Center for Theoretical Physics, Polish Academy of Sciences
ankys 2022/09/09(金) - 14:34
概要

The recent detection of gravitational waves by on-Earth laboratories is an incredibly impressive achievement of experimental physics. It is also a tremendous success of the theory of general relativity. It confirms the existence of black holes, shows that binary black holes exist and that they may collide, and that during the merging process gravitational waves are produced. These are all predictions of general relativity theory in its fully nonlinear regime.

It is well known that after predicting gravitational waves in 1916 Einstein became uncertain about their physical reality. It wasn't until the 1950's and early 60's that their physical status was clarified. Important contributions to the development of the theory of gravitational radiation were made by Hermann Bondi, Felix Pirani, Roger Penrose, Ivor Robinson and Andrzej Trautman. In particular, in 1958, Andrzej Trautman from Leopold Infeld's relativity group in Warsaw delivered a series of highly influential lectures on gravitational radiation at King's College London, which established the foundations of the gravitational wave theory.

In this talk we show how the Einstein's intuitive concept of a gravitational wave was evolving from the linearized gravity to a precise mathematical notion in the fully nonlinear Einstein's General Relativity. Since Trautman's PhD thesis from 1958 we know that a gravitational wave is a solution of a certain boundary value problem for the Einstein equations. In my talk I also briefly show how the existence theorem for this mathematical problem was proven. This stablished the reality of gravitational radiation. This achievement of 25years old Trautman was one of the first instances of the use of recently fashionable `geometric analysis'.

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URL:https://forms.gle/yUMzws4F1ugnnFQ27
締切日:10月7日(金)18時(先着48名)

2022/07/11 Mon 16:00 - 17:00 | Zhe Wang
ACTUARIAL MODELLING
開催日時
2022/11/09 水 02:29 - 02:29
2022/11/09 水 02:29 - 02:29
2022/11/09 水 02:29 - 02:29
2022/11/09 水 02:29 - 02:29
2022/11/09 水 02:29 - 02:29
2022/11/09 水 02:29 - 02:29
講演者
Łukasz Delong
講演者所属
SGH Warsaw School of Economics / The Polish Society of Actuaries
ankys 2019/10/04(金) - 13:34
概要

第1部は、初学者を対象として、アクチュアリー業務の最新トピックから、「保険に内在する保証の評価」「ERM」「ニューラルネットワーク」の3つを取り上げて紹介する。
第2部は、保険会社のリスク測定とモデリング手法に着目した4回の講義から構成される。まず、代表的なリスク指標であるバリュー・アット・リスク(VaR)と期待損失(Expected Shortfall)とその特徴を紹介し、欧州保険資本規制(SolvencyⅡ)や国際会計基準(IFRS17)においてどのようにリスクを測定しているかを論じる。その後、多変量損失モデル、コピュラ、従属性尺度など従属事象を扱うモデルを紹介し、実際にExcelを用いたリスク測定を試みる。
第3部は、学生の様々な質問に対して、講師が大学やコンサルティング会社における実務経験をふまえたアドバイスを行う。

2019/10/03 Thu 11:00 - 12:00 | Will Donovan
2019/06/20 Thu 13:00 - 14:00 | Gennadi Kasparov
2019/04/24 Wed 14:45 - 16:15 | Kenji Matsuki