Program

Nov. 17 (Wed)

09:50 – 10:00 : Opening Remarks

morning session1: (Chair: O-Kab Kwon)

10:00 – 10:50 : Koji Hashimoto (Kyoto University) “An energy bound on chaos”

10:50 – 11:00 : break(10)

morning session2: (Chair: Jae-Hyuk Oh)

11:00 – 11:50 : Jaewon Song (KAIST) “a vs c”

11:50 – 12:00 : break(10)

12:00 – 12:50 : Beni Yoshida (Perimeter Institute) “Decoding the Entanglement Structure of Monitored Quantum Circuits”

12:50 – 14:00 : Lunch

afternoon session1: (Chair: Sang-Heon Yi)

14:00 – 14:50 : Wontae Kim (Sogang Univ.) “De Sitter space is really hot or not”

14:50 – 15:00 : break(10)

15:00 – 15:50 : Hyeong-Chan Kim (Korea National Univ. of Transportation) “Tolman temperature in general relativity”

15:50 – 16:10 : coffee break(20)

afternoon session2: (Chair: Mu-In Park)

16:10 – 16:50 : Miok Park (IBS) : “Identifying Riemannian Singularity with Non-Riemannian Regularity”

16:50 – 17:00 : break(10)

17:00 – 17:30 : Lu Yin (CQUeST) “Gravitational waves from the vacuum decay with LISA”

17:30 – 18:10 : Seokcheon Lee (Sungkyunkwan Univ.) : “Cosmology of minimally extended Varying Speed of Light (meVSL)”

Nov. 18 (Thu)

morning session1: (Chair: Kang-Sin Choi)

09:00 – 09:50 : Sang-Jin Sin (Hanyang Univ.) “Correlation induced topology and Stability of the Flat band”

09:50 – 10:00 : break(10)

10:00 – 10:50 : Tatsuo Kobayashi (Hokkaido University) “On effective field theory from string compactification”

coffee break(20)

morning session2: (Chair: Miok Park)

11:10 – 12:00 : Yuki Yokokura (RIKEN) “Interior metric of Thermodynamical black holes”

12:00 – 12:10 : break(10)

12:10 – 12:40 : Byoungjoon Ahn (GIST) “Islands in linear dilaton black holes”

12:40 – 14:00 : Lunch

afternoon session1: (Chair: Inyong Cho)

14:00 – 14:50 : Roy Kerr (University of Canterbury) “Black Holes, then and now ”

14:50 – 15:00 : break(10)

15:00 – 15:50 : Hyung Won Lee (Inje Univ.) “Constraining the orbital eccentricity of inspiralling compact binary systems with Advanced LIGO”

15:50 – 16:10 : coffee break(20)

afternoon session2: (Chair: Wonwoo Lee)

16:10 – 17:00 : Gianmassimo Tasinato (Swansea University) “Probing the Physics of Inflation with Gravitational Wave Experiments”

17:00 – 17:10 : break(10)

17:10 – 17:40 : Chan Park (NIMS) “Data Analysis for Multi-Channel Gravitational Wave Detectors”

17:40 – 18:20 : Jeongwon Ho (CQUeST, Sogang Univ.) : “Strong cosmic censorship conjecture and asymptotic geometries”

Nov. 19 (Fri)

morning session1: (Chair: Hyun Seok Yang)

09:00 – 09:50 : Changrim Ahn (Ewha Womans University) “Sausage and Cigar at finite temperature”

09:50 – 10:00 : break(10)

10:00 – 10:50 : Akihiro Ishibashi (Kindai University) “Averaged Null Energy Conditions and Holography”

coffee break(20)

morning session2: (Chair: Yun Soo Myung)

11:10 – 12:00 : Rong-Gen Cai (ITP, CAS) “No Cauchy horizon theorem for hairy black holes”

12:00 – 12:10 : break(10)

12:10 – 12:50 : Kyung Kiu Kim (Sejong Univ.) “Deformed JT Gravity with Matter ”

12:50 – 14:00 : Lunch

afternoon session1: (Chair: Gungwon Kang)

14:00 – 14:50 : Naritaka Oshita (RIKEN) “Black hole overtones and their significance”

14:50 – 15:00 : break(10)

15:00 – 15:50 : Oscar Campos Dias (Univ. of Southampton) “Diving into the interior of asymptotically flat hairy black holes and maximal warm holes”

15:50 – 16:10 : coffee break(20)

afternoon session2: (Chair: Chan Park)

16:10 – 17:00 : Jinn-Ouk Gong (Ewha Womans Univ.) “TBA"

17:00 – 17:10 : break(10)

17:10 - 18:00 : Suddhasattwa Brahma (Univ. of Edinburgh) “Early-universe cosmology from BFSS theory”

18:00 – 18:30 : Rajibul Shaikh (SeoulTech) “Shadow in a general rotating spacetime obtained through Newman-Janis algorithm”

Nov. 20 (Sat)

morning session1: (Chair: Kyung Kiu Kim)

09:00 – 09:50 Hyun Seok Yang (GIST) “Stability of Einstein Manifolds”

09:50 – 10:00 : break(10)

10:00 – 10:50 : Chanyong Park (GIST) “Dual field theory of a p-brane gas geometry”

10:50 – 11:00 : break(10)

morning session2: (Chair: Chanyong Park)

11:00 - 11:40 : O-Kab Kwon (Sungkyunkwan Univ.) "Supersymmetric Inhomogeneous Field Theories"

11:40 – 12:30 : Matteo Baggioli (Shanghai Jiao Tong University) “What can we learn about amorphous solids from black holes?”

12:30 - 14:00 Lunch

14:00 - 18:00 : Discussion

18:00 - 18:10 : Closing

==== Abstracts ====

Koji Hashimoto (Kyoto University) “An energy bound on chaos”

We conjecture an upper bound on the energy dependence of the Lyapunov exponent for any classical/quantum Hamiltonian mechanics and quantum field theories. The conjecture states that the Lyapunov exponent as a function of the total energy grows no faster than linearly in the energy, in the high energy limit, under plausible physical conditions on the Hamiltonian. To the best of our knowledge this chaos energy bound is satisfied by any classically chaotic Hamiltonian system known. We provide arguments supporting the conjecture for generic classically chaotic billiards and multi-particle systems.

Beni Yoshida (Perimeter Institute) “Decoding the Entanglement Structure of Monitored Quantum Circuits”

Clifford circuit, including explicit constructions of logical and stabilizer operators, are also presented. Applications of our framework to various physical questions, including non-Clifford systems, are discussed as well. Namely, we argue that the entanglement structure of a monitored quantum circuit in the volume-law phase is largely independent of the initial states and past measurement outcomes except recent ones, due to the decoupling phenomena from scrambling dynamics, up to a certain polynomial length scale which can be identified as the code distance of the circuit. We also derive a general relation between the code distance and the sub-leading contribution to the volume-law entanglement entropy. Applications of these results to black hole physics are discussed as well.

Roy Kerr (University of Canterbury) “Black Holes, then and now ”

Do spinning black holes have singularities? We did not believe so in the sixties and my opinion has not changed. All proofs to the contrary rely on Raychadhuri’s theorem plus the assumption about affine parameters. I shall give a trivial counter example to this. Also, since at least 1938 there has been an enormous effort put into solving the 2-body problem for black holes. I will show that the asymptotic fields that LIGO uses could have been calculated trivially.

Hyung Won Lee (Inje Univ.) “Constraining the orbital eccentricity of inspiralling compact binary systems with Advanced LIGO”

The detection of $\sim 50$ coalescing compact binaries with the Advanced LIGO and Virgo detectors has allowed us to test general relativity, constrain merger rates, and look for evidence of tidal effects, compact object spins, higher waveform modes, and black hole ringdowns. An effect that has not yet been confidently detected is binary eccentricity, which might be present in a small fraction of binaries formed dynamically. Here we discuss general limits on eccentricity that can, in-principle, be placed on all types of compact object binaries by a detector operating at the design sensitivity of Advanced LIGO. Using a post-Newtonian model for gravitational-wave phasing valid in the small eccentricity regime, we assess the relative measurement error for eccentricity for a variety of spinning and non-spinning binaries. Errors and correlations involving the mass and spin parameters are also investigated. We find that decreasing the low frequency limit of a detector's observational frequency band is one of the key design factors for increasing the odds of measuring binary eccentricity. We also introduce and analytically explore the \emph{eccentric chirp mass} parameter, which replaces the chirp mass as the key measurable parameter combination in eccentric gravitational waveform models. The eccentric chirp mass parameter explains a degeneracy between the chirp mass and the eccentricity. This degeneracy leads to a bias in the standard chirp mass parameter. We also investigate the systematic parameter bias that arises when eccentric systems are recovered using circular waveform templates. We use both Fisher matrix and Bayesian-inference-based Markov Chain Monte Carlo (MCMC) methods to investigate these parameter estimation issues, and we find good agreement between the two approaches (for both statistical and systematic errors) in the appropriate signal-to-noise ratio regime. This study helps to quantify how effectively one can use eccentricity measurements as a probe of binary formation channels.

Oscar Campos Dias (Univ. of Southampton) “Diving into the interior of asymptotically flat hairy black holes and maximal warm holes”

We discuss a family of four-dimensional, asymptotically flat, charged black holes that develop scalar hair as one increases their charge at fixed mass. Surprisingly, the maximum charge for given mass is a nonsingular hairy black hole with nonzero Hawking temperature. The implications for Hawking evaporation are discussed. Inside the event horizon, these black holes resemble the interior of a holographic superconductor. There are analogs of the Josephson oscillations of the scalar field, and the final Kasner singularity depends very sensitively on the black hole parameters near the onset of the instability.

Akihiro Ishibashi (Kindai University) “Averaged Null Energy Conditions and Holography”

We first discuss, in the context of AdS/CFT correspondence, the notion of the no-bulk-short cut principle, which asserts that the “fastest” null geodesic connecting any two boundary points must lie entirely on the boundary. Then, by applying this principle, we show that the Averaged Null Energy Condition (ANEC) with a certain weight function holds for strongly coupled quantum fields on the boundary with closed spatial section. In odd-dimensions, this version of ANEC becomes conformally invariant. As an application, we examine this version of ANEC in a spacetime describing an evaporating black hole and discuss how negative energy flux appears.

Matteo Baggioli (Shanghai Jiao Tong University) “What can we learn about amorphous solids from black holes?”

In recent years, an intriguing correspondence between soft-matter and high-energy physics is emerging, including a possible link between elasticity of amorphous solids and rheology of black holes, but direct comparisons between theoretical predictions and experimental/simulation observations remain limited. Here, we investigate the effects of non-linear elasticity on yielding and entropy in amorphous materials, by considering first an effective field theory (EFT) and then a gravitational model in the spirit of the holographic principle. Interestingly, the simulation results of granular matter models are qualitatively consistent with the theoretically predicted correlations among the non-linear elastic exponent, the yielding point and the entropy change, with discriminable non-linear features uncaptured by previous theories. In this talk, I will discuss the main features of the different frameworks involved, how to connect them together and the future of this program.