Seminar detail: Double-Scaled SYK, QCD, and the Flat Space Limit of de Sitter Space

Date&Time	Mon Jun 02 2025 (13:00 - 14:00)
Speaker	Yasuhiro Sekino
Affiliation	Takushoku U.
Title	Double-Scaled SYK, QCD, and the Flat Space Limit of de Sitter Space
Abstract	A surprising connection exists between double-scaled (DS) SYK at infinite temperature, and large N QCD. The large N expansions of the two theories have the same form; the 't Hooft limit of QCD parallels the fixed p limit of SYK (for a theory with p-fermion interactions), and the limit of fixed gauge coupling g -- the flat space limit in AdS/CFT -- parallels the double-scaled limit of SYK. From the holographic perspective fixed g is the far more interesting limit of gauge theory, but very little is known about it. DSSYK allows us to explore it in a more tractable example. Based on the conjectured duality between DSSYK and de Sitter space, we further argue that the bulk theory in the flat-space limit (which describes the Rindler space) is the 't Hooft model ((1+1)-dimensional QCD ) in the large N limit with fixed g. Based on Y.S. and L. Susskind, arXiv:2501.09423, and S. Miyashita, Y.S. and L. Susskind (to appear).
Remarks
Slide/Video	video1