"Higher-spin symmetry in AdS, CFT, twistor space and de Sitter"
TBA
"Higher spins and AdS scattering amplitudes"
TBA
"Recent progress on generalized supergravity and Yang-Baxter deformations"
Recently, there has been a fundamental and significant development about the Green-Schwarz (GS) formulation of superstring theory. In this formulation, the kappa-symmetry plays a central role to ensure the consistency of the theory. In 2016 Tseytlin and Wulff showed that the kappa-symmetry constraints of the GS superstring defined on an arbitrary background lead to a ``generalized'' supergravity, which contains an additional (non-dynamical) vector field, rather than the standard supergravity. This result indicates that we have overlooked a potentially important ingredient in the low-energy effective theory of string theory for long time, and may open up new directions including phenomenology and cosmology. In this talk, I will briefly introduce the recent progress on the generalized supergravity by focusing upon Yang-Baxter deformations and non-geometric aspects.
"Vacuum Energy and Black-Hole Geometry"
We consider the influence of the expectation value of the quantum energy-momentum operator in quantum field theories on the geometry of black holes through the semi-classical Einstein equation. We show that different models of the vacuum energy-momentum tensor lead to different near-horizon geometries.
"Modular Hamiltonians of excited states, OPE blocks and emergent bulk fields"
TBA
"TBA"
"Black Holes, Firewalls and Qubits"
TBA
"Matrix supergroup Chern-Simons models for vortex-antivortex systems"
TBA
"Spinning Geodesic Witten Diagrams"
We consider the so-called geodesic Witten diagrams (GWDs). GWDs are proposed recently as the gravity dual of conformal blocks(CBs) in the previous work (arXiv: 1508.00501). We generalize this relation to GWDs and CBs including fields with spin. In this talk, firstly I will review the relation between GWDs and CBs for the scalar case and introduce our work. This talk is based on the collaboration with Heng-Yu Chen and En-Jui Kuo (arXiv: 1702.08818).
"Parallel tempering algorithm for integration over Lefschetz thimbles"
Lefschetz thimbles method often meets a difficulty (multimodal problem) in actual Monte Carlo calculations due to the infinitely high potential barriers between different thimbles. We propose to use the flow time of the antiholomorphic gradient flow as an auxiliary variable for such multimodal distribution. In this algorithm, we can take the maximum flow time to be sufficiently large such that the sign problem disappears there, and two separate modes are connected through configurations at small flow times. In this talk, I briefly review the Lefschetz thimble method and introduce our work through the example of the (0+1)-dimensional massive Thirring model at finite density.
"Deformations of the Almheiri-Polchinski model "
We study Yang-Baxter deformations of a specific 1+1 D dilaton gravity model called the Almheiri-Polchinski model. We present a deformed black hole solution with conformal matters and compute the Bekenstein-Hawking entropy. This work is based on arXiv:1701.06340/1704.07410 with Hideki Kyono and Kentaroh Yoshida.
"Axial U(1) current in Grabowska and Kaplan's formulation"
Recently, Grabowska and Kaplan suggested a non-perturbative formulation of a chiral gauge theory (arXiv:1511.03649). This formulation consists of the conventional domain-wall fermion and a gauge field that evolves by the gradient flow from one domain wall to the other. We construct a 4D vector-like theory using this formulation and define naively the axial U(1) current in the theory. It is found that the current is exactly conserved and does not reproduce the chiral anomaly because it includes a contribution from the bulk. In this talk, I will briefly review their formulation and explain the mechanism of the conservation. This talk is based on the collaboration with Hikaru Kawai (arXiv: 1705.01317).