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Résumé |
Motivated by various bottom-up expectations of quantum gravity, it was conjectured
in [Distler, Freed, Moore'09] and [McNamara, Vafa'19] that there exists a finite
energy density domain wall separating Type IIA and Type IIB string theories in
10d. Such a domain wall would necessarily be non-supersymmetric and has no known
formulation in string perturbation theory. In this talk, I will detail a
nonperturbative construction of such a domain wall in the setting of discrete
lightcone quantizations of Type II string theories developed in the late '90s. I
will also survey work in progress on constructing similar domain walls between all
five 10d supersymmetric string theories, computing their energy densities, and the
prospects for exploring the non-BPS brane spectrum of string/M-theory more
generally.
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