FY2017 Annual Report

Quantum Gravity Unit
Assistant Professor Yasha Neiman

Abstract

Our work consisted of several strands. Yasha Neiman with students worked on higher-spin holography in de Sitter space. LinQing Chen worked on asymptotic symmetries of quantum electrodynamics in Minkowski space. Henry Stoltenberg worked on complexity of open quantum systems. Tomonori Ugajin worked on relative entropy in conformal field theories and holography.

1. Staff

  • Dr. Tomonori Ugajin, Postdoctoral Scholar
  • Dr. LinQing Chen, Postdoctoral Scholar
  • Dr. Henry Stoltenberg, Postdoctoral Scholar

2. Collaborations

2.1 Chaos and relative entropy in conformal field theory and holography

  • Description: This resulted in a joint paper in May 2018.
  • Type of collaboration: Joint research
  • Researchers:
    • Dr. Tomonori Ugajin, OIST
    • Dr. Yuya Nakagawa (then Ph.D. student), Tokyo University
    • Dr. Gabor Sarosi, University of Pennsylvania and Vrije Universiteit Brussel

3. Activities and Findings

3.1 Penrose transform in higher-spin gravity and its holographic dual

Yasha Neiman completed his work on establishing a twistor language for higher-spin holography. Holographic duality is a non-local relation between radically different descriptions of the same theory, formulated in terms of two different spacetimes. My work has established, for the first time and in a simple example, the existence of a third, intermediate, formulation, which doesn’t rely on spacetime at all, and puts the two sides of the duality on a common foundation. This work was featured in an OIST press release, “New math bridges holography and twistor theory”. It constitutes a step towards my long-term project of understanding higher-spin holography in de Sitter space.

3.2 Chaos and relative entropy in conformal field theory and holography

Tomonori Ugajin carried out his work on relative entropy in conformal field theories with a gravitational holographic dual. This resulted in a paper in May 2018, which used this quantity to study signatures of chaotic behavior, known to be related to information-scrambling by black holes. Over the following year, Tomonori made a name for himself by finding methods to calculate relative entropy in conformal field theories, and applying it to quantum-gravitational questions.

4. Publications

4.1 Journals

  1. Neiman, Yasha. The holographic dual of the Penrose transform. JHEP, doi:doi:10.1007/JHEP01(2018)100 (2018).

4.2 Books and other one-time publications

      Nothing to report

4.3 Oral and Poster Presentations

  1. Neiman, Yasha. The holographic dual of the Penrose transform: both AdS and CFT from twistor space, Quantum Gravity, String Theory and Holography, Kyoto, Japan, April 4 (2017).
  2. Neiman, Yasha. Towards Causal-Patch Physics in dS/CFT, ICGAC-13/IK-15, Seoul, South Korea, July 6 (2017).
  3. Neiman, Yasha. From infinity to the horizon through twistor space, KEK, Tsukuba, Ibaraki, Japan, November 9 (2017).
  4. Neiman, Yasha. Higher-spin symmetry in AdS, CFT, twistor space and de Sitter, Kyoto-NTU Workshop, Taipei, Taiwan, November 24-25 (2017).
  5. Stoltenberg, Henry. Black Holes, Firewalls and Qubits, 2017 Kyoto-NTU Workshop, Taipei, Taiwan, November 25 (2017).
  6. Neiman, Yasha. From infinity to the horizon without getting your feet wet, Weizmann Institute, Rehovot, Israel, December 4 (2017).
  7. Neiman, Yasha. AdS and CFT from twistor space, Neve Shalom joint high-energy physics seminar, Israel, December 5 (2017).
  8. Neiman Yasha. Twistor and spinor-helicity variables for higher-spin holography, Princeton University, New Jersey, USA, February 6 (2018).
  9. Ugajin, Tomonori. Relative entropy in CFT, High Energy Theory Seminar, Vrije Universiteit Brussels, Brussels, Belgium, February 16 (2018).
  10. Ugajin, Tomonori, Relative entropy in CFT, High Energy Theory Seminar, Ecole Polytechnique, Paris, France, February 19 (2018).
  11. Ugajin, Tomonori. Relative entropy in CFT, Delta ITP Meeting, Leiden, Netherlands, February 23 (2018).
  12. Ugajin, Tomonori. Relative entropy in CFT, Riken-Osaka-OIST joint workshop, OIST, Okinawa, Japan, March 12 (2018).
  13. Ugajin, Tomonori. Chaos and relative entropy, Holography, Quantum Entanglement and Higher Spin Gravity II, Kyoto University, Kyoto, Japan, March 15 (2018).

5. Intellectual Property Rights and Other Specific Achievements

Nothing to report

6. Meetings and Events

6.1 Lecture

  • Date: November 29, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Prof. Yasha Neiman (OIST), Prof. Yaron Oz (Tel Aviv University)
  • Title: Anomalous hydrodynamic transport: AdS/CFT informing condensed-matter physics

6.2 Seminar

  • Date: April 10, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Matthew J. Lake (Naresuan University)
  • Title: Karolyhazy-type relations for a dark energy Universe
     
  • Date: April 13, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Norbert Bodendorfer (LMU)
  • Title: Holographic signatures of resolved cosmological singularities
     
  • Date: May 16, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Ivan Arraut (Tokyo University of Science)
  • The Quantum Yang Baxter relations and the dispersion relation of the Nambu-Goldstone bosons
     
  • Date: May 30, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Henry Stoltenberg (University of California, Davis)
  • Title: 6.4 No Information Problem for Black Holes Entangled with Large External Systems
     
  • Date: October 4, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Dimitrios Giataganas (National Center for Theoretical Sciences)
  • Title: 6.5 Analytic Non-Integrability and Chaos in Gauge/Gravity duality
     
  • Date: November 14, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Justin C. Feng (The University of Texas at Austin)
  • Title: Temporal Insights from the End of Space
     
  • Date: December 12, 2017
  • Venue: OIST, Okinawa, Japan
  • Speaker: Lucas Fabian Hackl (Pennsylvania State University)
  • Title: Entanglement and Chaos: Linear entropy production at instabilities
     
  • Date: January 4, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Shao-Jiang Wang (Chinese Academy of Sciences)
  • Title: Gravitational waves from cosmological first-order phase transitions: bubble nucleation, bubble expansion and bubble percolation
     
  • Date: January 9, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Falk Hassler (UNC at Chapel Hill & University of Pennsylvania)
  • Title: 6.10 Double Field Theory
     
  • Date: February 20, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Aidan Chatwin-Davies (California Institute of Technology)
  • Title: Q-Screens and Tensor Networks: Two Cosmic No-Hair Theorems
     
  • Date: February 27, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Satoshi Okano (Nihon University)
  • Title: Twistor formulation of particles with spin
     
  • Date: March 23, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Dr. Dionysios Anninos (University of Amsterdam)
  • Title: Higher spin de Sitter holography
     
  • Date: March 27, 2018
  • Venue: OIST, Okinawa, Japan
  • Speaker: Prof. Tadashi Takayanagi (Kyoto University)
  • Title: Entanglement Purification and Holography

7. Other

Nothing to report.