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

2022/12/20 by Mitsuaki Hirasawa, Hirasawa, Mitsuaki, Κωνσταντίνος Αναγνωστόπουλος +11
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Theory (hep-th) #Noncommutative and Quantum Gravity Theories

paper · pdf · doi:10.48550/arxiv.2212.10127

openalex publication_date 2022/12/20 · openalex created_date 2023/01/04 · openalex updated_date 2026/07/28

Abstract

The Lorentzian type IIB matrix model is a promising candidate for a non-perturbative 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 to the original model 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.

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