| Based on initial conditions, the two-sided spacetime behaves differently with respect to the (thermodynamic) arrow of time. If the initial conditions are of low correlation, the two sides move in opposite time directions, but the structure as a whole follows the thermodynamic arrow of time. If the initial conditions are of high correlation, the individual entropies of the two sides can increase and decrease, there is not a dominance over time direction, and the overall structure is that of a one-sided spacetime. So, their argument on the dual structure is: less correlation = more disconnection between spacetime forming two-sided geometry more correlation = more connection, forming one-sided geometry Remember, though, that we are looking at dual views: gravity vs. quantum information theory and depending from which view you are describing, the words used to describe the system would be different. For example, two-sidedness in geometry refers to the gravity view. |