A Wave-function for Stringy Universes

Understand

We define a wave-function for string theory cosmological backgrounds.

• We give a prescription for computing its norm following an earlier analysis within general relativity.
• Under Euclidean continuation, the cosmologies we discuss in this paper are described in terms of compact parafermionic worldsheet systems.
• To define the wave-function we provide a T-fold description of the parafermionic conformal field theory, and of the corresponding string cosmology.