Journal club seminar: Holographic Quantum Error Correction

Discussion of the recent article by A. Almheiri "Holographic Quantum Error Correction and the Projected Black Hole Interior" by Henry Stoltenberg.

QG group meeting: Perturbative expansion of Renyi relative divergence and holography

Quantum Gravity Group Meeting:

Title: Perturbative expansion of Renyi relative divergence and holography

Speaker: Tomonori Ugajin, Quantum Gravity Unit (Neiman)

Journal club seminar: Black Hole Entropy and Soft Hair

Discussion of the recent article by Haco, Hawking, Perry and Strominger "Black Hole Entropy and Soft Hair" by Vyacheslav Lysov.

QG group meeting: Conformal Bootstrap at Finite Temperature

Quantum Gravity Group Meeting:

Title: Conformal Bootstrap at Finite Temperature 

Speaker: Sudip Ghosh, Quantum Gravity Unit (Neiman)

Journal club seminar: Consistency of Quantum Theory

Discussion of the recent article in Nature by D. Frauchiger and R. Renner "Quantum theory cannot consistently describe the use of itself" by Henry Stoltenberg.

QG group meeting: Fine-tuning and the Second Law in our de Sitter universe

Quantum Gravity Group Meeting

Title: Fine-tuning and the Second Law in our de Sitter universe

Speaker: Yasha Neiman

Journal club seminar: Symmetries and Charges of General Relativity at Null Boundaries

Discussion on symmetries and charges in general relativity at null boundaries by Lin-Qing Chen.

[Seminar] "Vacuum decay rate in the standard model and beyond" by Dr. Yutaro Shoji

Speaker: Dr. Yutaro Shoji from Nagoya University

Abstract:
The electroweak vacuum is not absolutely stable in the standard model and various models beyond the standard model. This is due to an appearance of another deeper vacuum, into which the electroweak vacuum can decay. The decay proceeds through quantum tunneling and the rate is expressed with an exponential suppression factor and a pre-factor. The suppression factor has been calculated in many papers, but a naive dimensional analysis has been usually adopted for the pre-factor.

We have pointed out that such an evaluation can suffer from large quantum corrections and it is important to calculate the pre-factor as well.

To calculate the pre-factor, we had problems in a gauge sector; its gauge invariance is not explicitly shown, and there appear zero modes, which we could not deal with.

We have solved these problems and made it possible to determine vacuum decay rates precisely.

As applications, we analyzed the decay rates in the standard model and its fermionic extensions. We also provide a public code, which can be used for models that exhibit classical scale invariance at a high energy scale.

QG group meeting: Expansions of the Black Hole Solution in AdS(3)

QG Group Meeting

Title: Expansions of the Black Hole Solution in AdS(3)

Speaker: Nico Fischer, Research Intern, Quantum Gravity Unit (Neiman)

Journal club seminar: Black hole memory effect

Discussion on Black Hole Memory Effect by Tomonori Ugajin.