The Lorentzian type IIB matrix model is a promising candidate for a non-perturbative formulation of superstring theory. However, it was recently found that a Euclidean space-time appears in the conventional large-N limit. In this work, we study the model with a Lorentz invariant mass term which can be considered as an IR regulator. By performing complex Langevin simulations to overcome the sign problem, we observe the emergence of expanding space-time with Lorentzian signature.
Hirasawa, M., Anagnostopoulos, K., Azuma, T., Hatakeyama, K., Nishimura, J., Papadoudis, S., et al. (2023). The emergence of expanding space-time in the Lorentzian type IIB matrix model with a novel regularization. In Corfu Summer Institute "22nd Hellenic School and Workshops on Elementary Particle Physics and Gravity", CORFU 2022. Sissa Medialab Srl [10.22323/1.436.0309].
The emergence of expanding space-time in the Lorentzian type IIB matrix model with a novel regularization
Hirasawa, M;
2023
Abstract
The Lorentzian type IIB matrix model is a promising candidate for a non-perturbative formulation of superstring theory. However, it was recently found that a Euclidean space-time appears in the conventional large-N limit. In this work, we study the model with a Lorentz invariant mass term which can be considered as an IR regulator. By performing complex Langevin simulations to overcome the sign problem, we observe the emergence of expanding space-time with Lorentzian signature.
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