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General Relativity and Quantum Cosmology (QG) Lab
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The lab explores the relationship between gravity and quantum physics through black holes and cosmology.
AboutAbout the lab
Exploring the relationship between gravity and quantum physics.
The QG Lab (General Relativity and Quantum Cosmology Lab) conducts a broad range of research on gravitational theory.
Centered on general relativity, the lab theoretically studies phenomena that occur under strong gravity, such as those around black holes, and problems in cosmology from the early universe to the present.
The lab also conducts fundamental research that applies quantum information theory on nontrivial spacetime structures to understand the relationship between gravity and quantum theory.
The lab holds weekly lab colloquia, seminars featuring invited external researchers, and sessions introducing newly published papers.
Key terms
- General Relativity
- Einstein's theory that explains gravity as the warping of time and space (spacetime)
- AdS/CFT Correspondence
- A relationship in which the gravitational theory in a certain kind of curved spacetime corresponds to a quantum field theory defined on its boundary
- Primordial Black Hole
- A black hole thought to have formed in the early universe when large density fluctuations collapsed under gravity
NewsLab news
View More ↗ResearchResearch themes
Gravity is the oldest known force, yet it is still being studied at the frontier of theoretical physics. Centered on general relativity, the lab theoretically studies phenomena under strong gravity, various problems in cosmology, and the relationship between gravity and quantum physics.
*Illustrative imageQuantum Information and Gravity
As understanding of the AdS/CFT correspondence advances, the lab attempts to incorporate quantum information into the geometry of spacetime, by using the holographic principle to understand the thermodynamic properties of black holes and by understanding generalized entropy. The lab also studies the quantum correlations in the quantum fluctuations of the inflationary universe.
*Illustrative imageBlack Hole Physics
The lab attempts to understand the mechanism of extracting a black hole's rotational energy through magnetic fields (the Blandford-Znajek mechanism, or BZ mechanism) as a limit of wave phenomena in black hole magnetospheres. The lab also studies the formulation of wave optics in black hole spacetimes, as well as analog models.
*Illustrative imagePrimordial Black Holes
Primordial black holes formed in the early universe are discussed as dark matter candidates and as the origin of the black hole binaries observed through gravitational waves. Drawing on knowledge of relativistic cosmology and nonlinear gravity, the lab pursues this research, also using numerical simulations.
*Illustrative imageTesting Black Hole Spacetimes
The lab theoretically estimates how modified gravity and matter distribution affect the motion of stars and pulsars around the black hole at the center of our galaxy, and the damped oscillations of gravitational waves (ringdown) from black holes formed by events such as neutron star mergers. The aim is to propose methods of testing these effects through observation.
MembersFaculty
Members of the QG Lab consist of faculty, and doctoral and master's students.As of 2026
- ProfessorAkihiro Ishibashi
- LecturerChulmoon Yoo
- YLC Specially Appointed Assistant ProfessorAlbert Escrivà
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Binary Black Hole” Jeremy Schnittman / CC BY 4.0 (cropped)
- Quantum Information and Gravity: “Deriving Emergent gravity from microscopic theories” Yormahmad Kholov / CC BY-SA 4.0 (cropped)
- Black Hole Physics: “Black hole jet diagram” NASA / Public domain (cropped)
- Primordial Black Holes: “Researchers announce LIGO detection of gravitational waves ( )” National Science Foundation / Public domain (cropped)
- Testing Black Hole Spacetimes: “VLT images of S301 and other S-stars orbiting Sagittarius A* (eso2612c)” ESO/GRAVITY collaboration / CC BY 4.0 (cropped)
- Related lab (Elementary Particle Theory (E) Lab): “Fermilab - CDF detector rolling in for run 2” 作者不詳 / Public domain (cropped)
- Related lab (Computational Biophysics (B) Lab): “CSIRO ScienceImage 294 Molecular Model of HIV Protein” division, CSIRO / CC BY 3.0 (cropped)
- Related lab (Space Physics (High-Energy Astronomy) (Uxg) Lab): “Chandra X-Ray Observatory in STS-93 Columbia's payload bay (MSFC-9904742)” NASA/KSC / Public domain (cropped)
- Related lab (Cellular Information Biophysics (K) Lab): “Predicted tertiary structure of ZNF568, which is 45.20% identical to the ZNF337 protein sequence. Created using SWISS-MODEL” Saure011 / CC BY-SA 4.0 (cropped)
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