Towards $A+B$ theory in conifold transitions for Calabi-Yau threefolds

Yuan-Pin Lee, Hui-Wen Lin, Chin-Lung Wang

For projective conifold transitions between Calabi-Yau threefolds $X$ and $Y$, with $X$ close to $Y$ in the moduli, we show that the combined information provided by the $A$ model…