The 39th International Symposium on Lattice Field Theory (Lattice 2022)

The emergence of expanding space-time in a novel large-N limit of the Lorentzian type IIB matrix model

11 Aug 2022, 11:30

20m

CP1-HSZ/1.001 (CP1-HSZ) - HS5 (CP1-HSZ)

Oral Presentation Theoretical Developments and Applications beyond Particle Physics Theoretical Developments

Speaker

Dr Mitsuaki Hirasawa (Istituto Nazionale di Fisica Nucleare (INFN))

Description

The Lorentzian type IIB matrix model is a promising candidate for a nonperturbative formulation of superstring theory. However, it was found recently that a Euclidean space-time appears in the conventional large-$N$ limit. In this work, we add a Lorentz invariant mass term and consider a limit, in which the coefficient of the mass term vanishes at large $N$. By performing complex Langevin simulations to overcome the sign problem, we observe the emergence of expanding space-time with the Lorentzian signature.

Presentation materials

Lattice_2022.pdf