One of the main motivations to construct string field theory (SFT) - an off-shell formulation of
a string theory - is a possibility to study non-perturbative phenomena in string theory.
1. Tachyon condensation in cubic NS SFT.
2. NS SFT around new vacuum - vacuum SSFT.
3. Solutions to vacuum SSFT.
4. Time-dependence solutions to NS SFT.