Speaker
Nicole Righi
Description
Heterotic toroidal orbifolds represent a powerful framework to inspect the landscape due to their modular properties. In this talk, I will review existing no-go theorems on heterotic de Sitter vacua and prove new ones for several classes of vacua, substantiating and extending previous conjectures. These theorems allow for a loophole once supersymmetry is broken: I will show the criteria that lead to metastable de Sitter vacua, also identifying the inherently stringy non-perturbative effect that break supersymmetry and potentially realise such vacua. Then, I will extend this basic setup to higher genera and show how to construct the building blocks needed to write the scalar potential and study brand new vacua.
