No.182 Seminar ： On the connection between gravity and information theory
- Assistant Professor Tomonori UGAJIN（Hakubi 10th batch,Theoretical Physics）
- 2020/06/23 4:50pm
- ZOOM (Closed)
- English
Summary
Although it is hard to conceive in our daily life, space and time are dynamical. About a hundred years ago, Einstein realized that the proper description of gravity inevitably involves the dynamics of space and time (general theory of relativity). GR predicts the concept of black holes, which are spacetimes with strong gravity so that even light rays can not escape. Now, one of the goals of physicists is finding a theory of quantum gravity, which governs the dynamics of microscopic spacetime. The fact that a black hole has thermal entropy which is proportional to its area is expected to be the key to achieve this goal. This fact led us to the notion of holographic principle, which states the equivalence between a theory of gravity on a bounded region and a quantum field theory living on its boundary. Holographic principle in some sense tells us that behind the notion of spacetime, some kind of information theoretic structure is hidden. In this talk, I will review these ideas related to quantum gravity.
Opening talk
Buddha and Pandemic
- Speaker：Associate Professor Ryuta KIKUYA（Hakubi 8th batch,Grduate School of Letters）
- Date：23th June 2020 (Tuesday), 16:30-
- Venue：Zoom (Closed)
- Presentation Language：Japanese (some English)
Summary
In the time of the Buddha, the plague was also a phantom force, just as it is today.”There are two kinds of disease which are produced by demonic agency(Yakṣiṇī), maṇḍalaka and adhivāsa. The plague maṇḍalaka, when it attacks a family, does not spare anyone, but carries away everybody. The plague called adhivāsa attacks a whole district.”
― Mahāvastu, Chapter 25
I will focus on the visualization of the plague as demons(Yakṣa/Yakṣiṇī and Rākṣasa/Rākṣasī), how to identify them with the disease and protect against these invisible force in Indo-Tibetan cultural region.