End of the world brane meets TT̄
Combined an end-of-the-world brane with a finite holographic cutoff and derived the corresponding lower-dimensional brane-world description by partial reduction.
HolographyBoundaries & DefectsTT̄
Theoretical physics
Feiyu Deng邓飞宇
Geometry, gravity,and quantum information.
Institute of Theoretical Physics, Chinese Academy of Sciences
Postdoctoral Researcher
Latest paper · · Preprint
Information clustering and geometric pressure in AdS3
Relates an entropy-partition memory-saving objective to a free-perimeter-plus-area optimization in the leading Einstein-AdS₃ vacuum RT entropy model, with a controlled ultraviolet error.
- Download main article · 53 pages
- Download companion note · 17 pages
- LaTeX source and reproducibility code
I study quantum gravity and holography, with a focus on how geometry encodes information in systems with black holes, boundaries and defects.
- Public papers
- 9
- Journal papers
- 6
- Preprints
- 3
Selected publications
Questions, written out.
JT gravity from partial reduction and defect extremal surface
Derived the JT gravity action from transverse brane fluctuations in a three-dimensional partial-reduction construction and matched island and defect-extremal-surface entropies.
Quantum GravityBlack HolesBoundaries & Defects
Page curve from defect extremal surface and island in higher dimensions
Derived Page curves from defect extremal surfaces, established precise agreement with the island formula in AdS₃/BCFT₂, and identified a higher-dimensional difference.
Black HolesHolographyBoundaries & Defects
Notes
Alongside the equations.
How to audit a long analytical derivation
Use finite-temperature interval entropy to practise dependency tracing, limit checks and matching across descriptions, with an explicit scope for each check.
Read noteGeometry as compression in theoretical physics
From single-interval entropy to information clustering, track what a geometric representation preserves and how to turn the picture back into checks.
Read noteWhat a defect extremal surface is
How quantum entropy on a defect enters extremization, and when it moves the surface or changes only the entropy.
Read noteProfile
Physics first. Tools in its service.
I am a theoretical physicist working on holography, black-hole information and quantum gravity. My research often focuses on situations in which boundaries, defects or lower-dimensional gravitational sectors modify the relation between geometry and quantum information. I also build research systems that connect physical intuition, analytic derivation, numerical checks, literature and manuscript development.