2026年2月6日（金）に、「量子力学とブラックホール」をテーマに、KMI、高等研究院（IAR）、学術変革A「極限宇宙」が共催する講演会を開催します。
アルバータ大学からValeri Frolovさん、ライプツィヒ大学からStefan Hollandsさんをお招きしてご講演いただきます。ぜひご参加ください。

開催概要

• 日時：2026年2月6日（金）10:30 – 12:30
• 場所：KMI理学シンポジア（ES総合館635）

タイムテーブル

• 10:30 – 11:15 “Black Holes and All That” by Valeri Frolov
• 11:15 – 11:30 Coffee Break & Discussions
• 11:30 – 12:15 “Negative Energy” by Stefan Hollands

講演概要

Black Holes and All That

Speaker: Valeri Frolov (University of Alberta)

Black holes are among the most fascinating and mysterious objects in the Universe. In this talk, I will give an accessible overview of how our understanding of black holes has developed, from early theoretical ideas to modern astronomical discoveries. We will discuss the role of black holes in astrophysics and cosmology, and how recent observations of gravitational waves—produced when two black holes collide—have opened a new window on the Universe. I will also touch on some of the deep theoretical questions raised by black holes, including what might exist inside them and why they continue to challenge our understanding of space, time, and gravity.
The talk will conclude with a brief look at some more exotic predictions of Einstein’s theory of general relativity, such as cosmic strings and the possibility of time machines.

Negative Energy

Speaker: Stefan Hollands (University of Leipzig)

Ordinarily, the actual energy is not physically significant but only energy differences are. But in general relativity, the absolute energy (density) appears on the right side of the Einstein equations as a component of the stress tensor. In this colloquium I explore how negative energy densities are thereby related to exotic phenomena such as warp drive spacetimes or wormholes.
I outline how quantum fluctuations enable negative energies and can be tiny, e.g. in the halos of black holes, or astronomical, e.g. inside black holes. In many interesting cases, the laws of physics limit the amount of possible negative energy. Such laws, such as the quantum null- or quantum dominant energy conditions, can be seen as a fundamental bridge between gravity and quantum information.