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Date
Presenter
Title and Abstract (Slides: authorized only)
2025/4/7
Akihiro Ishibashi
On the stability of static spacetimes (w/o a Killing horizon)
The exterior of the Schwarzschild black hole is known to be stable against linear perturbations. The complete proof is established by exploiting the energy integral method and spectral theory. I will first review the standard arguments for the stability analysis. Then, I will discuss possible challenges in applying these arguments to the recently discovered holographic semiclassical instability of de Sitter and AdS spacetimes induced by the backreaction of CFT stress-energy.
2025/4/28
Yoo Chulmoon
PBH formation in a matter dominated universe
This colloquium will begin with a review of the fundamental knowledge necessary for simulating the dynamics of primordial black hole formation. Following this, we will compare previously proposed analytical PBH formation conditions with numerical simulation results, focusing on the effects of inhomogeneity and ellipticity in the matter-dominated phase of primordial black hole formation. Finally, we will present the results of numerical simulations using the relativistic particle method and offer a discussion based on these findings.
2025/5/12
Albert Escrivà
TBA
TBA
2025/5/19
Rikuto Ohashi
TBA
TBA